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Littérature scientifique sur le sujet « Structures and metamorphism »

Auteur : Grafiati
Publié le 1 février 2025

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Articles de revues sur le sujet "Structures and metamorphism"

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Roy, A. B., et A. R. Das. « A Study on the Time Relations Between Movements, Metamorphism and Granite Emplacement in the Middle Proterozoic Delhi Supergroup Rocks of Rajasthan ». Journal Geological Society of India 26, no 10 (1 octobre 1985) : 726–33. http://dx.doi.org/10.17491/jgsi/1985/261004.

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Abstract The Delhi Supergroup rocks, an important tectonic-stratigraphic unit of the Aravalli Mountains, are affected by multiple folding and polyphase metamorphism. Three generations of deformational structures have been recognized in these rocks (DFI, DF2 and DF3). DFI structures which include a set of isoclinal folds with penetrative axial planar schistosity, were deformed successively by DF2 and DF3 folding movements. Microtcxtural studies of rocks yielded evidence for two metamorphic events-a progressive metamorphism (M1) rising upto epidote amphibolite facies, followed by a retrogressive phase (M3) under greenschist facies condition. Field and microscopic studies indicate that both DF1 and DF2 structures were formed during Ml phase, and DF3 structures were formed during the retrogressive phase (M2). The metamorphic climax of M1 phase was during the early phase of DF2, and the granites emplaced coevally with this event indicated ca. 1450 Ma Rb/Sr isochron age. No definite relationship could be established for the 850-700 Ma secondary (mineral) ages with DF3 deformation and M2 metamorphism.
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Webster, Ewan Russell, et David R. M. Pattison. « Spatially overlapping episodes of deformation, metamorphism, and magmatism in the southern Omineca Belt, southeastern British Columbia ». Canadian Journal of Earth Sciences 55, no 1 (janvier 2018) : 84–110. http://dx.doi.org/10.1139/cjes-2017-0036.

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The southeastern Omineca Belt of the Canadian Cordillera preserves a record of overlapping Barrovian and Buchan metamorphism spanning 180–50 Ma. This paper documents the timing, character, and spatial relationships that define separate domains of Middle Jurassic, Early Cretaceous, and Late Cretaceous deformation and metamorphism, and the nature of the geological interfaces that exist between them. A domain of Early Jurassic deformation (D1) and regional greenschist-facies metamorphism (M1) is cross-cut by Middle Jurassic (174–161 Ma) intrusions. Associated contact aureoles are divided into lower pressure (cordierite-dominated; ∼2.5–3.3 kbar; 1 kbar = 100 MPa) and higher pressure (staurolite-bearing; 3.5–4.2 kbar) subtypes; contact metamorphic kyanite occurs rarely in some staurolite-bearing aureoles. Jurassic structures are progressively overprinted northwards by Early Cretaceous deformation and metamorphism (D2M2), manifested in a tightening of Jurassic structures, development of more pervasive ductile fabrics, and Barrovian metamorphism. The D2M2 domain is the southerly continuation of the 600 km long Selkirk–Monashee–Cariboo metamorphic belt. Mid-Cretaceous intrusions (118–90 Ma) were emplaced throughout the D2M2 domain, the earliest of which contain D2 fabrics, but cut M2 isograds. The D2M2 domain makes a continuous, southeasterly transition into a domain of Late Cretaceous regional Barrovian metamorphism and deformation (D3M3; 94–76 Ma). The interface between these two domains is obscured by the coaxial nature of the deformation and the apparent continuity of the metamorphic zones, resulting in a complex and cryptic interface. Similarities between the D3M3 domain and the Selkirk Crest of Idaho and Washington suggest that this domain is the northerly continuation of the northward-plunging Priest River Complex.
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Monger, J. W. H. « Correlation of Settler Schist with Darrington Phyllite and Shuksan Greenschist and its tectonic implications, Coast and Cascade mountains, British Columbia and Washington ». Canadian Journal of Earth Sciences 28, no 3 (1 mars 1991) : 447–58. http://dx.doi.org/10.1139/e91-039.

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Amphibolite-facies Settler Schist in the southeastern Coast Mountains of British Columbia has long been correlated with Chiwaukum Schist of the Cascade metamorphic core, North Cascade Mountains, northwestern Washington. The additional correlation proposed here of Settler Schist with Darrington Phyllite and Shuksan Greenschist (and blueschist) of the Northwest Cascade System in Washington is based on along-strike near-continuity of outcrop areas, a similar protolith composition range, the same structural position relative to the Shuksan fault zone, and distinctive irregular structures in variably metamorphosed sandstone and pelite of both Darrington Phyllite and Settler Schist. If this correlation is valid, then the record of Early Cretaceous; subduction-related blueschist metamorphism of Shuksan–Darrington rocks was destroyed in Settler Schist by overprinting by early Late Cretaceous Barrovian metamorphism; only some distinctive, premetamorphic structures remain. The implication is that within the southeastern Coast Mountains, a cryptic record of subduction is overprinted by Barrovian metamorphism.
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Primmer, T. J. « A transition from diagenesis to greenschist facies within a major Variscan fold/thrust complex in SW England ». Mineralogical Magazine 49, no 352 (juin 1985) : 365–74. http://dx.doi.org/10.1180/minmag.1985.049.352.07.

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AbstractThe north coast of Cornwall, from Bude to Newquay, provides a continuous section through a major Variscan fold/thrust complex. Illite crystallinity studies have revealed a transition from diagenesis in the north to greenschist facies metamorphism in the south in the Upper Palaeozoic succession. More detailed studies of mineral assemblages in both metabasites and pelitic rocks support the regional pattern of metamorphism indicated by illite crystallinity, and show that locally in the Tintagel district, the grade of metamorphism may have reached middle to upper greenschist facies. An attempt to correlate the above data with temperatures (108–985°C) derived from O-isotope geothermometers is made. Interpretation of the metamorphic data presented helps to emphasize the tectonic importance of the major structures seen in the fold/thrust complex.
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Tarhan, Niyazi. « THE WORLDS RICHEST METABLASTIC ORE DEPOSITS ARE ASSOCIATED WITH CARBONATOBLASTIC ROCKS OF METAMORPHIC ORIGIN (KNOWN AS CARBONATITES) ». International Journal of Advanced Research 12, no 12 (31 décembre 2024) : 1061–85. https://doi.org/10.21474/ijar01/20114.

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In the Geology/Earth Sciences literature, carbonatites are accepted as rocks of magmatic origin that are rarely seen in nature as intrusions, carbonatite dykes, veins, pegmatitics, stocks, sills and lenses. The view that carbonatites are of magmatic origin and rarely seen in nature is definitely not true. On the contrary Carbonatites are rootless, metamorphic origin, a new type of modern metamorphic rocks, pure-impure leucocratoblastic (light colored, rock composed of different carbonate origin/based crystalloblast neominerals) carbonatoblastic rocks / carbonatoblastites / carbonatoblastic rock series and their derivatives. Pure-impure leucocratoblastic carbonatoblastic rocks / carbonatoblastites, whose primary source rocks are different (pure-impure carbonate/limestone) They form a type of leucocratoblastic metablastic rocks, which are of metamorphic origin, rootless, a type of new modern metamorphic rocks, with a granite mineralogical composition and composed of silicate origin/based crystalloblast neominerals. Carbonatoblastic rocks (known as carbonatites, rarely seen in nature, which are of magmatic origin until today) They developed in the last/second closing stage of the regional dynamothermal Tarhan metamorphism cycle, and they developed in the changing physical conditions (P/T) of the facies and sub-facies of Abukuma type reversed regional regressive dynamothermal metamorphism, where temperatures are effective in proportion to/compared to pressures (T>P, P, Pressure T, Temperature Temperatures put their stamp on the metamorphism). Previously existing primary source rock units pure-impure carbonate/limestones They developed in the first initial phase of the regional dynamothermal Tarhan metamorphism cycle, within pure and impure classical marbles, which are the metamorphic equivalents of Barrow type regional progressive dynamothermal metamorphism, where pressures are effective compared to/in proportion to temperatures (P>T, pressures put their stamp/mark on the metamorphism). Carbonatoblastic rocks/carbonatoblastites were derived in solid phase and in-situ (autochthonous) from the pure-impure classical marbles in the Abukuma type inverted regional regressive dynamothermal metamorphism type/phase that developed in the second/last closing phase of the metamorphism cycle. Metamorphic origin leucocratoblastic pure-impure carbonatoblastic rocks derived from pure-impure carbonate/limestones of different primary rocks They constitute a new type of modern metamorphic rocks of metamorphic origin, rootless, leucocratoblastic metablastites / metablastic rocks / metablastic rock series and their derivatives, defined for the first time under the general name, named and different types. Pure-impure carbonatoblastic rocks / carbonatoblastites / carbonatoblastic rock series and derivatives under the name of many carbonatoblastite type metablastic rocks (alkali metablastites, syenitoblastite, monzonitoblastite, calcitoblastite, calcito-dolomitoblastite, dolomitoblastite, sideritoblastite, stroncianitoblastite etc.) and carbonate origin / based rock forming main-secondary-trace crystalloblast neominerals (calcitoblast, dolomitoblast, witheritoblast, stroncianitoblast etc.) etymologically redefined for the first time, named, classified, physical-chemical properties determined. Carbonatoblastic rocks / Carbonatoblastites / Carbonatoblastic rock series and their derivatives It has been determined for the first time that they have very rich and widespread potential in terms of metablastic ore/mine deposits of metamorphic origin, defined and named for the first time. Different carbonatoblastic rock types develop depending on the composition and contents of pure-impure carbonate/limestones, which are pre-existing primary origin rock units. In the changing physical conditions (P/T) of the facies and sub-facies of the Abukuma type reversed regional regressive dynamothermal metamorphism, which developed in the last/second/closing phase of the regional dynamothermal Tarhan metamorphism cycle, where temperatures are effective compared to pressures (T>P, temperatures put their stamp on the metamorphism), protominerals (minerals of primary source rocks) - metaprotominerals (classical metamorphic minerals of metamorphic equivalent rocks of primary source rocks) lose their stability and are partially and completely gradually dissolved in the solid phase and in-situ. With dissolution in the solid phase solid neo-solutions with different chemical compositions, anhydrous, unstable and disordered structures, consisting of free and unstable ions (cation, anion) of different elements with increased electrically charged and atomic diffusion rates are widely developed. In the current physicochemical conditions of the facies and subfacies of the abukuma type inverted regional regressive dynamothermal metamorphism, recrystallization by metablastization commonly develops from unstable solid neo-solutions with different chemical compositions due to the temperatures effective in the environment. With the recrystallization developing by metablastation from solid neo-solutions rock-forming main-secondary-trace element cations, metallic-non-metallic ore cations, radioactive and rare earth elements/REE, which are incompatible elements with large ionic radii, are electrically charged, have increased atomic diffusion rates, and are free and unstable cations They combine with root carbonate anion (CO3)2-, root silicate anion (smooth surface silicon tetrahedral) (SiO4)4- / or [(Si, Al)O4]4- and oxygen (O2-) anions (due to polarization, solid-solid chemical reactions) and develop free blast/embryo/nucleus/bud and blast/embryo aggregates of their own unique/belonging minerals. In this way, the ions become electrically neutral and become stable. Blast/embryo, blast/embryo aggregates with the same and similar geochemical properties formed in the current/setting physicochemical conditions of Abukuma type reversed regional regressive dynamo-thermal metamorphism where temperatures are effective compared to pressures (T>P, temperatures put their stamp on the metamorphism) group among themselves and add to each other, and gradually grow as crystalloblast, porphyroblast and megacrystalloblast type rock-forming main-secondary-trace, metallic-non-metallic ore-forming, strategic, radioactive and light-heavy rare earth elements/REE free/independent crystalloblast neominerals. In this way, metallic-non-metallic ore crystalloblast neominerals, strategic crystalloblast neominerals, radioactive-rare earth elements/REE from incompatible elements with large ionic radii that cannot easily enter the crystal structures of rock-forming main-secondary-trace crystalloblast neominerals are naturally produced by their own crystalloblast neominerals. They become enriched and visible in the environment/setting. They are naturally enriched and become visible in the form of crystalloblast neominerals in leucocratoblastic carbonatoblastic rocks, which are rootless and a type of new modern metamorphic rocks of metamorphic origin. It has been determined and suggested for the first time that they develop the richest metamorphic-origin metablastic ore/mine deposits in the world by growing freely in the form of metallic-non-metallic crystalloblast neominerals that are unique/belonging to them. Carbonatoblastic rocks / Carbonatoblastites / Carbonatoblastic rock series and their derivatives are also very rich in terms of their contents of precious and semi-precious stones, ornamental stones (Gemology) and natural colored-patterned building stones (natural ceramic stones). Carbonatoblastic rocks They form the 2nd generation metamorphic rocks, the 3rd generation rocks, allotropic superionic metablastic matter / mine / rock / minerals and the 5th classical state of matter. All these geological phenomena appear before us as the products of the metamorphic view that constitutes the regional dynamo-thermal Tarhan metamorphism cycle that has been determined and suggested for the first time. They are not the products of the magmatic view. They are not the products of logical imagination models either. Therefore, if material, moral and temporal losses are not desired for scientific studies on similar topics, but reversible economic gains are desired, the magmatic view should be rejected. In contrast, the metamorphic view should be accepted.
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KHUDOLEY, ANDREI K., et SERGEI D. SOKOLOV. « Structural evolution of the northeast Asian continental margin : an example from the western Koryak fold and thrust belt (northeast Russia) ». Geological Magazine 135, no 3 (mai 1998) : 311–30. http://dx.doi.org/10.1017/s0016756898008747.

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The western Koryak fold and thrust belt consists of a set of tectonostratigraphic terranes that contain units ranging from Lower Palaeozoic to Cenozoic. Three deformational events have been identified in the study area. The first event structures are folds, domes and shear zones with related high-pressure/low-temperature metamorphism. These structures are early Carboniferous and are only recognized in the metamorphic terranes. The second event structures are imbricate fans of thrusts and folds with southeast vergence, broken formation and serpentinite mélange. These are latest Jurassic to early Cretaceous (early Albian) and occur throughout the study area. During this event, thrusting was accompanied by dextral strike-slip faulting. The second event structures are overlapped by the Upper Albian sedimentary rocks with an angular unconformity at the base. During metamorphism associated with the first and second deformational events, some of the rocks were metamorphosed to blueschist grade and were affected by strain with axial ratios of up to 15[ratio ]1. The third deformational event is characterized by significant sinistral strike-slip displacement at higher crustal levels. This resulted in a new set of structures and rotation of pre-existing structures. The age of the sinistral strike-slip faults is interpreted to be late Cretaceous to Cenozoic. The kinematics of the second and third deformational events correspond to assumed proto-Pacific plate motions based on palaeomagnetic data.
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Umar, U. S. « METAMORPHISM AND DEFORMATION OF GOLD-BEARING NEOPROTEROZOIC WONAKA SCHIST BELT, NORTHWEST-NIGERIA. » Open Journal of Physical Science (ISSN : 2734-2123) 5, no 1 (10 juillet 2024) : 1–17. http://dx.doi.org/10.52417/ojps.v5i1.626.

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The role of metamorphism and deformation is indispensable in the occurrences of gold mineralization worldwide. In this work, deformation and metamorphic conditions for gold-bearing Neoproterozoic Wonaka Schist Belt; located around Kutcheri town of Tsafe Local Government of Zamfara State, was investigated. This is achieved using metamorphic litho-minerals obtained from ternary plots via X-Ray fluorescence (XRF) geochemical data, and directly using minerals phases from X-Ray Diffraction (XRD) technique. Index minerals identified from petrographic analysis previously suggest low to medium-grade metamorphism (M1). XRD analysis indicates quartz, albite, oligoclase, microcline, chlorite, and biotite, suggesting greenschist to lower amphibolite facies (M2). Sillimanite, andalusite, kyanite, staurolite, chlorite, biotite, and garnet were identified from the ternary plots using XRF major oxides, indicating upper amphibolite to granulite facies metamorphism (M3). This is typical of prograde metamorphism, granulite facie metamorphic grade is indicated. Na2O/Al2O3 versus K2O/Al2O3 for petrogenetic character suggests shale provenance, while the trace elements spider diagram indicates Wonaka litho-units as co-genetic compositionally, as high concentrations of V and Cr linked the petrogenetic affinity to mafic sources. Three circles of deformations are indicated; ductile deformation (D1) of the paleosome Schist producing foliations and lineation, brittle type (D2) in mid Pan-African and was accompanied by several fractures and felsic intrusions. Late Pan-African (D3) involves the folding of banded orthogneisses, the development of boudinage as well as intense shearing (ductile fault). Geospatial analysis of the fractures suggests that they represent regional Pan-African sutures cross-cutting Nigeria into the Atlantic and up to South American plate. The research therefore concludes that Au-fluid emanating through this regional event, utilizes D2 as channel ways and loci. D3 with M3 engulfed the entire structures repositioning the geometry to its present disposition.
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Webster, Ewan Russell, David Pattison et S. Andrew DuFrane. « Geochronological constraints on magmatism and polyphase deformation and metamorphism in the southern Omineca Belt, British Columbia ». Canadian Journal of Earth Sciences 54, no 5 (mai 2017) : 529–49. http://dx.doi.org/10.1139/cjes-2016-0126.

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The Omineca Belt between Nelson and Creston in southeastern British Columbia was affected by overlapping pulses of Mesozoic magmatism, metamorphism, and deformation. U–Pb geochronological data from zircon and monazite were collected by laser ablation – inductively coupled plasma – mass spectrometry (LA–ICP–MS) to constrain the timing of these events. The Porcupine Creek stock (162.3 ± 1.3 Ma) intruded across folds and fabrics associated with the earliest phase of regional deformation and metamorphism (D1M1), restricting it to the Early–Middle Jurassic. The Jurassic structures are overprinted northwards by Early Cretaceous deformation and metamorphism (D2M2). The Baldy pluton (117.8 ± 1.2 Ma) crosscuts the regional 144–134 Ma M2 isograds, yet was pervasively affected by the D2 deformation, indicating that D2 deformation outlasted M2 metamorphism but had ceased by 111 Ma, the age of an undeformed pluton. Monazite dates from a kyanite-bearing rock in the contact aureole of the Middle Jurassic Wall stock overlap with the age of the intrusion (167 Ma), indicating a contact rather than regional origin for the kyanite. In the southeast part of the study area, three samples from the regional sillimanite zone contain monazite intergrown with sillimanite that yield dates between 80 and 69 Ma, indicating an episode of Late Cretaceous (M3) Barrovian metamorphism and deformation (D3). To the north of this domain, in an area characterized by the older D2M2 deformation, a sillimanite zone schist contains two main monazite age populations, suggestive of overlapping effects of Early Cretaceous and Late Cretaceous metamorphic episodes.
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Ziultsle, O. V., et V. V. Ziultsle. « Breed Associations of the Gaisin Block of the Ukrainian Shield ». Geochemistry and ore formation, no 42 (2021) : 61–70. http://dx.doi.org/10.15407/gof.2021.42.061.

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The Gaysins block is characterized by a wide range of both metamorphic and ultrametamorphic formations. Ultrametamorphic formations are represented by an association of rocks with a transition from charnockitoids to two-feldspar granites. Remnants of metamorphic rocks are composed of diafluorinated varieties to varying degrees. Geological surveys of the last decades have discovered on the territory of the Gaysin block structures of variegated composition, which are represented by both metamorphic and ultrametamorphic rocks. The most studied are structures in the area of the settlements of Chagiv, Tyagun, Sitkovtsi, Naraevka, Tsibuliv and Popudnya. The wide variety of the mineral composition of the rocks of the Gaysinsky block is due to the metamorpho-metasomatic transformations of the primary parageneses formed under the conditions of the granulite facies. These transformations are taking place against the background of a decrease in the PT parameters of regional metamorphism.
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Gal, L. P., et E. D. Ghent. « Metamorphism in the Solitude Range, southwestern Rocky Mountains, British Columbia : comparison with adjacent Omineca Belt rocks and tectonometamorphic implications for the Purcell Thrust ». Canadian Journal of Earth Sciences 27, no 11 (1 novembre 1990) : 1511–20. http://dx.doi.org/10.1139/e90-161.

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Rocks of the Solitude Range, British Columbia, have been metamorphosed from chloritoid–chorite-zone to kyanite-zone conditions. The grade of metamorphism increases southwestward toward the Rocky Mountain Trench (RMT) and the Omineca Belt. Isograds crosscut lithologies and trend more northerly than deformation 2 (D2) structures and the RMT. They are thought to have been quenched syn- to post-D2. Pelitic (Mahto Formation) and calc-pelitic (Tsar Creek unit) rocks contain assemblages that reflect the increase in metamorphic grade. Physical conditions of metamorphism are estimated to be approximately 450–540 °C from the garnet to the kyanite zone; pressures averaged 6–7 kbar (1 kbar = 100 MPa). The pressures, temperatures, and metamorphic assemblages are very similar to those of the Adamant Range, which lies across the Purcell Thrust, to the southwest. This is in contrast with the Big Bend area, to the northwest, where differences in pressure across the Purcell Thrust (PT) have been documented. Two possible models to explain these contrasting relationships are presented. One model suggests that there was post-movement heating on the PT, which reduced the metamorphic contrast across the PT. The second model suggests that a combination of thrust and normal faulting, including warping of isobaric surfaces, has produced an apparently unbroken metamorphic sequence across the PT.
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Thèses sur le sujet "Structures and metamorphism"

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Forest, Richard C. « Structures and metamorphism of Ptarmigan Creek area, Selwyn Range, B.C ». Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=63337.

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Herren, Eveline. « Structures, deformation and metamorphism of the Zanskar area (Ladakh, NW Himalaya) / ». [S.l.] : [s.n.], 1987. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=8419.

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Goswami, Sudipta. « Inverted metamorphism in the Sikkim-Darjeeling Himalaya : structural, metamorphic and numerical studies ». Thesis, University of Cambridge, 2005. https://www.repository.cam.ac.uk/handle/1810/284048.

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The structural and metamorphic evolution of the Darjeeling-Sikkim Himalaya, a “classical” region of inverted metamorphism in the Himalaya, has been investigated by field studies combined with 2-D numerical modelling of the thermal evolution. In the Himalaya, an orogen-wide zone of inverted isograds is spatially associated with the Main Central Thrust (MCT). In the Sikkim-Darjeeling region, an inverted metamorphic field gradient is indicated by garnet-grade rocks in the upper Lesser Himalaya (LH), which increase in grade to sillimanite + K-feldspar assemblages in the middle to upper structural levels of the Higher Himalayan Crystallines (HHC). Metamorphic breaks in the “Barrovian sequence” have been established between the garnet- and sillimanite-bearing rocks in the Darjeeling region and between the kyanite-staurolite schists and biotite-sillimanite schists in Sikkim. Since the accurate location of the MCT is critical to constraining the metamorphic evolution of the Higher and Lesser Himalaya, a number of criteria are used in defining the MCT zone in this region. These include lithologic contrasts, increase in non-coaxial deformation features towards the MCT zone and geomorphology. The MCT forms a zone of distributed ductile deformation that has propagated southwards with time, resulting in a 3-10 km wide zone, containing rocks from both the Higher and Lesser Himalaya. Four episodes of deformation and two metamorphic events have been identified in the HHC. Textural evidence and garnet zoning profiles indicate a single episode of prograde metamorphism, but four deformation events in the MCT zone and the LH. Garnet zoning profiles from the HHC indicate retrograde equilibrium. M1 resulted in a peak assemblage of prismatic sillimanite + K-feldspar as well as muscovite dehydration melting resulting in millimetre to centimetre scale leucosomes, while M2 is associated with rapid exhumation of the HHC during simultaneous movement along the MCT and the South Tibetan Detachment System (STDS) forming decompression textures in metabasic boudins and pelites.
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McFarlane, Christopher R. M. « Metamorphism, structure and tectonic evolution of the Matthew Creek Metamorphic Zone, Kimberley, British Columbia ». Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0024/MQ31363.pdf.

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Ambrose, Tyler. « Structure, metamorphism, and tectonics of the northern Oman-UAE ophiolite and underlying metamorphic sole ». Thesis, University of Oxford, 2017. http://ora.ox.ac.uk/objects/uuid:e9520624-0f91-4c9d-a9b9-e9e2fc5d5517.

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Ophiolites - thrust sheets of oceanic lithosphere that have been emplaced onto the continental margin - provide the opportunity to explore the structure and genesis of oceanic crust. As many ophiolites formed above subduction zones, they also allow for the investigation of mantle wedge and subduction interface processes. This the- sis examines the Oman-United Arab Emirates (UAE) ophiolite, which is the largest and most intensely studied ophiolite on Earth. Three distinct problems are addressed. (1) Recent research has proposed that the architecture and tectonic evolution of the ophiolite in the UAE differs from in Oman. In Chapter 2, I test this hypothesis by integrating new geological mapping and field observations with previously published maps of the ophiolite in the UAE. My results indicate that the ophiolite is gently folded, but otherwise largely intact. I demonstrate that the architecture of the ophi- olite in the UAE is not significantly different from in Oman. Thus, there is no basis for a different tectonic evolution as recently proposed. (2) Observations from exper- iments and small-scale natural shear zones indicate that volumetrically-minor phases can control strain localization. In Chapter 3, I test the hypothesis that minor phases control strain-localisation at plate boundaries. To do so, I analyzed peridotites from the base of the ophiolite, a palaeosubduction interface. My results demonstrate that minor phases limited olivine grain growth, which led to rheological weakening. (3) The mechanisms by which metamorphic soles detached from the downgoing slab and accreted to the hanging-wall mantle is unclear. In Chapter 4, I examine a transect across the metamorphic sole in the UAE. My results reveal that granulite formation was more extensive than is typically considered. I propose that granulite formation resulted in rheological strengthening, which caused the subduction interface to migrate into the downgoing slab and accrete the metamorphic sole.
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Standley, Carl E. « Banda forearc metamorphic rocks accreted to the Australian continental margin : detailed analysis of the Lolotoi Complex of East Timor / ». Diss., CLICK HERE for online access, 2007. http://contentdm.lib.byu.edu/ETD/image/etd1696.pdf.

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Walker, James David. « The structure and metamorphic evolution of the High Himalayan Slab in SE Zanskar and NW Lahaul ». Thesis, University of Oxford, 1998. http://ora.ox.ac.uk/objects/uuid:fc8b8fd3-e155-4f2f-9256-3667c2b31f4f.

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This thesis attempts to unravel the complex thermal and structural history of part of the High Himalayan Slab in NW India and combines reconnaissance-style field structural mapping of an area covering ~10,000 km2 with petrography, microstructural analysis, thermobarometry and geochronology techniques. The results of this work show that the oldest protoliths of the High Himalayan Slab are at least Cambrian in age and that they may have experienced a major pre-Himalayan metamorphism at c.500 Ma. The youngest protoliths are Mesozoic in age (the Tandi Group) and demonstrate that the High Himalayan Slab represents the metamorphosed equivalents of the Tibetan Sedimentary Series. Metamorphism was achieved via substantial crustal shortening and thickening following the India-Asia collision at 50-54 Ma ago. Phase relationships demonstrate that metamorphism was a regional Barrovian-type event associated with the growth of biotite-, garnet-, staurolite-, kyanite- and sillimanite-bearing assemblages in metapelites. Quantitative thermobarometry demonstrates that near-peak conditions of c.6-8 kbar and 550-650°C were attained in the deepest exposed levels. Growth of metamorphic assemblages was underway by at least 30 Ma, as indicated by U-Pb ages of metamorphic monazites. Exhumation of the High Himalayan Slab was achieved through a combination of extensional unroofing along major detachments (namely the Zanskar Shear Zone), thermal doming, thrusting along the Main Central Thrust and surface erosion. Exhumation is closely associated with the growth of sillimanite- and cordierite-bearing assemblages in pelites and the generation and emplacement of crustal melt leucogranites in the upper parts of the slab. U-Pb dating of accessory phases from one of the crustal melt leucogranites (the Gumburanjon leucogranite) constrains its crystallisation and emplacement age at c.21-22 Ma. This is only slightly older than its 40Ar/39Ar muscovite and biotite cooling ages of c.20-21 Ma, which is attributed to the emplacement of the Gumburanjon leucogranite into the immediate footwall of the ZSZ. Field and geochronological data therefore support a strong temporal and spatial relationship between upper crustal melting and extension in a convergent orogen.
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Miller, Martin Gregg. « Structural and kinematic evolution of the Badwater Turtleback, Death Valley, California / ». Thesis, Connect to this title online ; UW restricted, 1992. http://hdl.handle.net/1773/6716.

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Daczko, Nathan Robert. « The Structural and Metamorphic evolution of cretaceous high-P granulites, Fiordland, New Zealand ». University of Sydney. Geosciences, 2002. http://hdl.handle.net/2123/822.

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Fiordland is located southwest of South Island of New Zealand. The field area of this thesis is in northern Fiordland, at the boundary of pristine arc rocks (Median Tectonic Zone) and a belt of Paleozoic paragneisses and orthogneisses of variable age that represent the metamorphosed paleo-Pacific Gondwana margin.
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Gupta, Saibal. « Structure and metamorphism of Sikinos, Cyclades, Greece ». Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.363344.

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Livres sur le sujet "Structures and metamorphism"

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1937-, Sharma R. S., et Thomas H, dir. Metamorphism and crustal evolution : Papers in honour of prof. R.S. Sharma. New Delhi : Atlantic Publishers & Distributors, 2005.

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Sovetskiĭ komitet po Mezhdunarodnoĭ programme "Litosfera.", dir. Glubinnye ksenolity i stroenie litosfery : Proekt--Ksenolit. Moskva : "Nauka", 1987.

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Chakrabarti, B. K. Precambrian geology of the Himalaya : Structure and metamorphism. New Delhi : Capital Pub. Co., 2009.

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Chakrabarti, B. K. Precambrian geology of the Himalaya : Structure and metamorphism. New Delhi : Capital Pub. Co., 2009.

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R, Fowler C. M., et Mineralogical Association of Canada, dir. Short course on heat, metamorphism and tectonics. St. John's, Newfoundland : Mineralogical Association of Canada, 1988.

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Pande, I. C. Tectonic and metamorphic investigations of Kumaon-Garhwal-Himachal Lesser Himalaya. New Delhi : Today & Tomorrow's Printers & Publishers, 1991.

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Robyr, Martin. Thrusting, extension and doming in the High Himalaya of Lahul-Zanskar area (NW India) : Structural and pressure-temperature constraints. Lausanne, Suisse : Section des sciences de la terre, Université de Lausanne, 2002.

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V, Balaganskiĭ V., Zagorodnyĭ Vladimir Georgievich et Geologicheskiĭ institut (Akademii͡a︡ nauk SSSR. Kolʹskiĭ filial im. S.M. Kirova), dir. Stroenie i metamorficheskai͡a︡ ėvoli͡u︡t͡s︡ii͡a︡ glavnykh strukturnykh zon Baltiĭskogo shchita. Apatity : Kolʹskiĭ filial AN SSSR, 1987.

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Moore, J. M. A comparative study of metamorphosed supracrustal rocks from the western Namaqualand Metamorphic Complex. [Cape Town] : University of Cape Town, Dept. of Geology, 1989.

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Sears, Derek W. G., 1948-. et United States. National Aeronautics and Space Administration., dir. The cooling history and structure of the ordinary chondrite parent bodies. [Washington, DC : National Aeronautics and Space Administration, 1998.

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Chapitres de livres sur le sujet "Structures and metamorphism"

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Bhattacharya, A. R. « Deformation and Metamorphism ». Dans Structural Geology, 373–84. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-80795-5_19.

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Rabu, D., J. P. Brun et J. Chantraine. « Structure and Metamorphism ». Dans Pre-Mesozoic Geology in France and Related Areas, 96–110. Berlin, Heidelberg : Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/978-3-642-84915-2_5.

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Panko, A. V., I. G. Kovzun, V. A. Prokopenko, O. A. Tsyganovich, V. O. Oliinyk et O. M. Nikipelova. « Nano- and Microdisperse Structures in Processes of Metamorphism, Reduction Sintering, and Component Separation of Iron-Oxide-Silicate Materials ». Dans Springer Proceedings in Physics, 743–55. Cham : Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-56422-7_57.

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Troll, G., et S. Weiss. « Structure, Petrography and Emplacement of Plutonic Rocks ». Dans Equilibrium and Kinetics in Contact Metamorphism, 39–66. Berlin, Heidelberg : Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-642-76145-4_3.

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Bard, J. P. « Principal Textures of Metamorphic Rocks ». Dans Petrology and Structural Geology, 182–253. Dordrecht : Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4640-8_7.

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Bard, J. P. « Orders of Crystallization in Metamorphic Rocks ». Dans Petrology and Structural Geology, 70–107. Dordrecht : Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4640-8_5.

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Valsamos, Charalampos, Vassilis C. Moulianitis et Nikos Aspragathos. « Metamorphic Structure Representation : Designing and Evaluating Anatomies of Metamorphic Manipulators ». Dans Advances in Reconfigurable Mechanisms and Robots I, 3–11. London : Springer London, 2012. http://dx.doi.org/10.1007/978-1-4471-4141-9_1.

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Maresch, W. V., P. Blümel et W. Schreyer. « A Search for Variations in the Structural States of Cordierite in Contact-Metamorphosed Pelites ». Dans Equilibrium and Kinetics in Contact Metamorphism, 297–314. Berlin, Heidelberg : Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-642-76145-4_14.

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Du, Keke, Mingyue Jiang, Zuohua Ding, Hongyun Huang et Ting Shu. « Metamorphic Testing in Fault Localization of Model Transformations ». Dans Structured Object-Oriented Formal Language and Method, 299–314. Cham : Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-41418-4_20.

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Nakajima, Shin. « Dataset Diversity for Metamorphic Testing of Machine Learning Software ». Dans Structured Object-Oriented Formal Language and Method, 21–38. Cham : Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-13651-2_2.

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Actes de conférences sur le sujet "Structures and metamorphism"

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Bonev, Nikolay. « MINERAL COMPOSITIONS OF SOME ROCK-FORMING MINERALS IN THE LOW-GRADE SEDIMENTARY AND MAFIC ROCKS, EASTERN CIRCUM-RHODOPE BELT, BULGARIA ». Dans 24th SGEM International Multidisciplinary Scientific GeoConference 24, 99–104. STEF92 Technology, 2024. https://doi.org/10.5593/sgem2024/1.1/s01.14.

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The eastern Circum-Rhodope belt (CRB) is a major unit that surrounds both the Serbo-Macedonian and the Rhodope zones in the Alpine orogen of the northern Aegean region. This belt contains Triassic-Jurassic metasedimentary successions and Middle Jurassic (176-165 Ma) supra-subduction zone Evros ophiolite. The latter has experienced ocean-floor hydrothermal metamorphism or very-low to low-grade metamorphism. We report on mineral compositions of rock-forming minerals in schist and mafic rocks from the eastern CRB. Our goal is to use the mineral compositions to assess the metamorphic conditions suffered by the rocks. The studied minerals include amphibole, garnet and mica. The electron probe microanalyzer was used to obtain the mineral chemistry recalculated into the mineral structural formula. The amphiboles in the mafic rocks have the compositions from magnesio-hornblende to edenite hornblende, which includes also actinolite-hornblende to actinolite and ferro-tschermakite in the greenschists. In the mica schist, the amphibole is magnesian-hastingsite, which is associated with almandine garnet, muscovite and biotite. The mineral assemblage studied, and its composition, reflects unequivocally greenschist facies metamorphic conditions experienced by the rocks. These conditions are further confirmed by the abundant chlorite and epidote observed in the metasedimentary and metamafic rocks. Thus, our study extends quantitively the metamorphic grade and conditions pertinent to the eastern CRB rocks.
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Yang, Qiang, Andrew P. Murray, David H. Myszka et Shujun Li. « Structure Synthesis of Multi-DOF Planar Metamorphic Mechanisms With a Single Driver ». Dans ASME 2020 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/detc2020-22196.

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Abstract This paper approaches the type synthesis of multi-degree of freedom planar metamorphic mechanisms with a single driver in a systematic process. The process is facilitated by implementing a constraint status matrix and a equivalent resistance matrix as a method for identifying an appropriate structure of planar metamorphic mechanisms with a single driver. Multi-structures can be obtained from the same source metamorphic mechanism by designing different constraint architectures of metamorphic joints. To determine the constraint architectures of metamorphic joints and their different assembly combinations, the constraint status matrix is built based on the task-based metamorphic cyclogram of a source mechanism. According to the equivalent resistance gradient model and the constraint status matrix, an equivalent resistance matrix for the metamorphic joints is proposed. A structural synthesis matrix of the metamorphic mechanism is then obtained from the equivalent resistance matrix by deducing the constraint-form vectors of the metamorphic joints. Furthermore, an effective kinematic diagram synthesis of the source mechanism of the planar metamorphic mechanism is proposed which is based only on the 14 one or zero degree-of-freedom (DOF) linkage groups. The entire structural design method of a metamorphic mechanism is based on the structural synthesis matrix and given in steps. Finally, a proposed structural design approach is illustrated by two examples.
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Liu, Jing-Sheng, Geoff Parks et John Clarkson. « Metamorphic development - A new topology optimization method for truss structures ». Dans 40th Structures, Structural Dynamics, and Materials Conference and Exhibit. Reston, Virigina : American Institute of Aeronautics and Astronautics, 1999. http://dx.doi.org/10.2514/6.1999-1387.

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Klinger, V., A. Wekkeli, T. Roesener, M. Scheer et F. Dimroth. « Development of metamorphic buffer structures for inverted metamorphic solar cells ». Dans 2011 37th IEEE Photovoltaic Specialists Conference (PVSC). IEEE, 2011. http://dx.doi.org/10.1109/pvsc.2011.6186003.

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Wei, Guowu, Vahid Aminzadeh, Evangelos Emmanouil et Jian S. Dai. « Structure Design, Kinematics and Grasp Constraint of a Metamorphic Robotic Hand for Meat Deboning Operation ». Dans ASME 2013 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/detc2013-13408.

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A four-fingered metamorphic robotic hand with a reconfigurable palm is presented in this paper with the application in deboning operation of meat industry. This robotic hand has a reconfigurable palm that generates changeable topology and augments dexterity and versatility for the hand. Mechanical structure and design of the robotic hand are presented and based on mechanism decomposition, kinematics of the metamorphic hand is investigated with closed-form solutions leading to the workspace characterization of the robotic hand. Based on the kinematics of the four-fingered metamorphic hand, utilizing product-of-exponentials formula, grasp map and grasp constraint of the hand are then formulated revealing the grasp robustness and manipulability performed by the metamorphic hand. A prototype of the four-fingered metamorphic hand is consequently fabricated and integrated with low level control and sensor systems leading to a scenario of applying the hand in the field of meat industry for deboning operation.
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Wang, Xifeng, Shijun Huang, Fenglan Zhao et Xinrong Liu. « Study on Microscopic Pore-Fracture Structure of Metamorphic Buried Hill Reservoirs ». Dans 58th U.S. Rock Mechanics/Geomechanics Symposium. ARMA, 2024. http://dx.doi.org/10.56952/arma-2024-0201.

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ABSTRACT: The reservoir space of metamorphic buried hill reservoirs are complex and the heterogeneity is strong. It is difficult to fully characterize the micro pore and fracture structure of single resolution digital core. In this paper, multi-resolution CT and FIB-SEM scanning were performed on the cores of metamorphic buried hill reservoirs. The image registration method is used to match the core images of different resolutions. The union of pore structure at each resolution is taken to characterize the distribution law of pore and fractures quantitatively. The results showed that multi-scale digital core can more fully reflect the multi-type and multi-scale pore and fracture structure of metamorphic buried hill reservoir; The total porosity of the core is 1.25 %. The fracture is the main storage and seepage space. This method realizes the multi-scale characterization of the microscopic pore and fracture structure of metamorphic buried hill reservoirs, and provides a reference for similar complex reservoir research. 1. INTRODUCTION A large number of buried hill reservoirs have been recognized worldwide, such as Zeit Bay, Bach Ho, Bozhong 19-6 fields, and so on (Mi et al., 2023; Trice et al., 2022). A buried hill is defined as a hydrocarbon accumulation in younger sedimentary formations in buried hill traps. The lithologies of buried hill reservoirs include metamorphic, igneous, and sedimentary rocks (Han et al., 2020). According to statistics, metamorphic rocks account for 40% of the world's total buried hill reservoirs, and oil and gas reserves account for 75% of the total reserves (Zhang et al., 2023). However, the metamorphic buried hill reservoir has developed fractures, complex spatial structure, and strong heterogeneity (Liu et al., 2020). An accurate understanding of the microstructure of metamorphic buried hill reservoirs is the key to the efficient development of such reservoirs. The digital core has the unique advantages of non-destructive and three-dimensional characterization, which greatly retains the original characteristics of reservoir pores and fractures, and is an effective means of reservoir microstructure research. However, there is a contradiction between the field of view and the resolution of the digital core (Lin et al., 2019). When the resolution is low, a larger core size can be obtained, but at the same time, some microstructure information will be lost. When the resolution is high, the microscopic characteristics of the core are more refined, but there may be a problem that the representative volume unit (Gitman et al., 2007; Kanit et al., 2003) cannot be obtained. Therefore, it is necessary to integrate multi-scale information to describe the core structure.
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Zhang, Liping, Jian S. Dai et Ting-Li Yang. « Reconfiguration Techniques and Geometric Constraints of Metamorphic Mechanisms ». Dans ASME 2009 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/detc2009-87345.

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This paper proposes a geometric way to generate metamorphic configurations and investigates metamorphic principles based on geometrized displacement group. Metamorphic reconfiguration techniques are revealed as the variations of kinematic joints, kinematic links and geometric orientation constraints particularly by examining the invariant configuration properties of a mechanism. The nature of all these configuration changes belongs to geometric constraint category. Metamorphic configuration units are proposed as the irreducible reconfiguration modules to envelop these reconfiguration techniques. It can self-reconfigure or be combined to generate metamorphosis. Moreover, the geometrized displacement group is lent to achieve a geometric representation for configuration modelling and further reconfiguration operations. Based on seting up kinematic group extended qualitatively according to its group structure, geometrized displacement group modelling is proposed for these identified metamorphic configuration units. The investigated group motion-matrix is an integration of its displacement group properties and kinematic extensions. Then defined geometric constraint relations and the proposed dependence rules lead to metamorphic principles. In this way, metamorphic process is mapped to matrix operations under group extensions and their compositions. Design examples and a metamorphic joint with six configurations are given to illustrate the feasibility of these metamorphic principles.
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Zhang, Liping, et Jian S. Dai. « Genome Reconfiguration of Metamorphic Manipulators Based on Lie Group Theory ». Dans ASME 2008 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/detc2008-49906.

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This paper investigates reconfiguration which was induced by topology change as a typical character of metamorphic mechanisms in a way analogous to the concept of genome varation in biological study. Genome is the full complement of genetic information that an organism inherits from its parents, espercially the set of genes they carry. Genome variation is to study the change and variation of this complement with genetic information and genes connectivity and is analogous to mechanisms reconfiguration of metamorphic mechanisms. Metamorphic mechanisms with reconfigurable topology are usually changing their configurations and varying mobility in accordance with different sub-working phase functions. The built-in spatial biological modules are for the first time compiled and introduced in this paper based on metamorphic building blocks in the form of metamorphic cells and associated inside break-down parts as the metamorphic genes for metamorphic bio-modeling as genome. The gene sequencing labels the genetic structure composition principle of the metamorphic manipulators. The bio-inspired mechanism configuration evolution is further introduced in this paper motivated by biological concept to metamorphic characteristics as different sub-phase working mechanisms gradually change and develop into different forms in a particular situation and over a period of time, as an evolutionary process of topological change that takes place over several motion phases during which a taxonomic group of organisms showing the change of their physical characteristics. Moreover, the proposed genetic structure composition principle in metamorphic manipulators leads to the development of module evolution and genetic operations based on the displacement subgroup algebraic properties of the Lie group theory. The topology transformations can further be simulated for configuration evolution and depicted with the genetic growth and degeneration in the living nature. Genome sequential reconfiguration for metamorphic manipulators promises to be mapped from degenerating the source generator to multiple sub-phase configurations. Evolution design illustrations are given to demonstrate the concept and principles.
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Kumar Jha, Animesh, Abhishek Vaish, Simona Sternad Zabukovšek et Samo Bobek. « A Comparative Study of Metamorphic Malware Detection Techniques ». Dans Challenges in Economics and Business in the Post-COVID Times. University of Maribor Press, 2022. http://dx.doi.org/10.18690/um.epf.5.2022.4.

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Malware is a major threat in the evolving global cyber space. The different detection techniques that currently exist are insufficient at detecting metamorphic malware, as they can change the internal structure of their code, thus keeping the flow of the programme equivalent to the virus. Commercial antivirus software depends on signature detection algorithms to identify viruses, however, code obfuscation techniques can successfully circumvent these algorithms. The objective of this research is to analyse the various detection techniques of such metamorphic malware used over the years and to unearth the strengths, weaknesses and advance research directions possible in the field of the detection of metamorphic malware.
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Son, Chang-Young, Chang Kyu Kim, Dae Jin Ha, Tae Shik Yoon, Sunghak Lee et Nack J. Kim. « Powder Injection Molding of Cu-Based Amorphous Powders and Fe-Based Metamorphic Powders ». Dans ASME 2008 2nd Multifunctional Nanocomposites and Nanomaterials International Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/mn2008-47051.

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Powder injection molding (PIM) process was applied to Cu-based amorphous alloy powders and Fe-based metamorphic alloy powders, and microstructure, hardness, and wear resistance of the PIM products were analyzed. When Cu-based amorphous powders were injection-molded and sintered at 470 °C, sintering was not made since most of amorphous phases were replaced by crystalline phases. When sintered at higher temperatures, volume fraction of pores inside the sintered specimens decreased, but sintering was not properly conducted. When Fe-based metamorphic powders were injection-molded and then sintered at 1200 °C, completely densified products with almost no pores were obtained. They contained 34 vol.% of (Cr, Fe)2B borides dispersed in the austenitic matrix without amorphous phases. Since these (Cr, Fe)2B borides were hard and thermally stable, hardness, high-temperature hardness, and wear resistance of the PIM products of Fe-based metamorphic powders were twice as high as those of conventional PIM stainless steel products. These findings suggested new applicability of the PIM products of Fe-based metamorphic powders to structures and parts requiring excellent mechanical properties.
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Rapports d'organisations sur le sujet "Structures and metamorphism"

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Harris, L. B., P. Adiban et E. Gloaguen. The role of enigmatic deep crustal and upper mantle structures on Au and magmatic Ni-Cu-PGE-Cr mineralization in the Superior Province. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/328984.

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Aeromagnetic and ground gravity data for the Canadian Superior Province, filtered to extract long wavelength components and converted to pseudo-gravity, highlight deep, N-S trending regional-scale, rectilinear faults and margins to discrete, competent mafic or felsic granulite blocks (i.e. at high angles to most regional mapped structures and sub-province boundaries) with little to no surface expression that are spatially associated with lode ('orogenic') Au and Ni-Cu-PGE-Cr occurrences. Statistical and machine learning analysis of the Red Lake-Stormy Lake region in the W Superior Province confirms visual inspection for a greater correlation between Au deposits and these deep N-S structures than with mapped surface to upper crustal, generally E-W trending, faults and shear zones. Porphyry Au, Ni, Mo and U-Th showings are also located above these deep transverse faults. Several well defined concentric circular to elliptical structures identified in the Oxford Stull and Island Lake domains along the S boundary of the N Superior proto-craton, intersected by N- to NNW striking extensional fractures and/or faults that transect the W Superior Province, again with little to no direct surface or upper crustal expression, are spatially associated with magmatic Ni-Cu-PGE-Cr and related mineralization and Au occurrences. The McFaulds Lake greenstone belt, aka. 'Ring of Fire', constitutes only a small, crescent-shaped belt within one of these concentric features above which 2736-2733 Ma mafic-ultramafic intrusions bodies were intruded. The Big Trout Lake igneous complex that hosts Cr-Pt-Pd-Rh mineralization west of the Ring of Fire lies within a smaller concentrically ringed feature at depth and, near the Ontario-Manitoba border, the Lingman Lake Au deposit, numerous Au occurrences and minor Ni showings, are similarly located on concentric structures. Preliminary magnetotelluric (MT) interpretations suggest that these concentric structures appear to also have an expression in the subcontinental lithospheric mantle (SCLM) and that lithospheric mantle resistivity features trend N-S as well as E-W. With diameters between ca. 90 km to 185 km, elliptical structures are similar in size and internal geometry to coronae on Venus which geomorphological, radar, and gravity interpretations suggest formed above mantle upwellings. Emplacement of mafic-ultramafic bodies hosting Ni-Cr-PGE mineralization along these ringlike structures at their intersection with coeval deep transverse, ca. N-S faults (viz. phi structures), along with their location along the margin to the N Superior proto-craton, are consistent with secondary mantle upwellings portrayed in numerical models of a mantle plume beneath a craton with a deep lithospheric keel within a regional N-S compressional regime. Early, regional ca. N-S faults in the W Superior were reactivated as dilatational antithetic (secondary Riedel/R') sinistral shears during dextral transpression and as extensional fractures and/or normal faults during N-S shortening. The Kapuskasing structural zone or uplift likely represents Proterozoic reactivation of a similar deep transverse structure. Preservation of discrete faults in the deep crust beneath zones of distributed Neoarchean dextral transcurrent to transpressional shear zones in the present-day upper crust suggests a 'millefeuille' lithospheric strength profile, with competent SCLM, mid- to deep, and upper crustal layers. Mechanically strong deep crustal felsic and mafic granulite layers are attributed to dehydration and melt extraction. Intra-crustal decoupling along a ductile décollement in the W Superior led to the preservation of early-formed deep structures that acted as conduits for magma transport into the overlying crust and focussed hydrothermal fluid flow during regional deformation. Increase in the thickness of semi-brittle layers in the lower crust during regional metamorphism would result in an increase in fracturing and faulting in the lower crust, facilitating hydrothermal and carbonic fluid flow in pathways linking SCLM to the upper crust, a factor explaining the late timing for most orogenic Au. Results provide an important new dataset for regional prospectively mapping, especially with machine learning, and exploration targeting for Au and Ni-Cr-Cu-PGE mineralization. Results also furnish evidence for parautochthonous development of the S Superior Province during plume-related rifting and cannot be explained by conventional subduction and arc-accretion models.
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Ryan, J. J., A. Zagorevski, N. R. Cleven, A J Parsons et N. L. Joyce. Architecture of pericratonic Yukon-Tanana terrane in the northern Cordillera. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/326062.

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West-central Yukon and eastern Alaska are characterized by widespread metamorphic rocks that form part of the allochthonous, composite Yukon-Tanana terrane and parautochthonous North American margin. Structural windows through the Yukon-Tanana terrane expose parautochthonous North American margin in that broad region, particularly as mid-Cretaceous extensional core complexes. Both the Yukon-Tanana terrane and parautochthonous North American margin share the same Late Devonian history, making their discrimination difficult; however, distinct post-Late Devonian magmatic and metamorphic histories assist in discriminating Yukon-Tanana terrane from parautochthonous North American margin rocks. The suture between Yukon-Tanana terrane and parautochthonous North American margin is obscured by many episodes of high-strain deformation. Their main bounding structure is probably a Jurassic to Cretaceous thrust, which has been locally reactivated as a mid-Cretaceous extensional shear zone. Crustal-scale structures within composite Yukon-Tanana terrane (e.g. the Yukon River shear zone) are commonly marked by discontinuous mafic-ultramafic complexes. Some of these complexes represent orogenic peridotites that were structurally exhumed into the Yukon-Tanana terrane in the Middle Permian.
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Jackson, S. L., et T. M. Gordon. Metamorphism and structure of the Laurie Lake region, Manitoba. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1985. http://dx.doi.org/10.4095/120201.

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Jackson, S. L. Alteration Zones, Structure, and Metamorphism of the Laurie Lake area. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1989. http://dx.doi.org/10.4095/127274.

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Steenkamp, H. M., N. Wodicka, O. M. Weller, J. Kendrick, I. Therriault, T. Peterson, C. J M Lawley et V. Tschirhart. Bedrock geology, Wager Bay area, Kivalliq, Nunavut, parts of NTS 56-F, G. Natural Resources Canada/CMSS/Information Management, 2023. http://dx.doi.org/10.4095/331890.

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New geological mapping in the Tehery Lake-Wager Bay area of northwestern Hudson Bay, Nunavut, frames the emplacement, depositional, and metamorphic histories of the dominant rock types, major structures, and links to neighbouring areas of the central Rae Craton and Chesterfield Block. The area is divided into six domains (Ukkusiksalik, Douglas Harbour, Gordon, and Lunan domains presented here, and Kummel Lake Domain and Daly Bay Complex on adjoining maps) defined by large-scale structures and characterized by differing metamorphic assemblages, Sm-Nd and U-Pb isotopic data, and/or specific lithologies. Meso- to Neoarchean granitoid rocks underlie most of the area and are tectonically intercalated with Archean (volcano)sedimentary packages (Kummel Lake, Lorillard, and Paliak belts). These rocks are locally intruded by ca. 2.62 to 2.58 Ga Snow Island suite granite and cut by younger, thin, east-trending diabase dykes. Paleoproterozoic (volcano)sedimentary rocks are preserved in the Kingmirit belt (Daly Bay Complex) and in basement-cover infolds of Ketyet River group-equivalent strata (Douglas Harbour and Ukkusiksalik domains). In the south, the Daly Bay Complex (comprising mostly mafic granulite-facies rocks) and Kummel Lake Domain (a granulite-grade core complex) share some characteristics with rocks of the Kramanituar and Uvauk complexes, which may delineate the northeastern segment of the ca. 1.90 Ga Snowbird tectonic zone. The Paleoproterozoic Trans-Hudson Orogeny had widespread, penetrative structural and metamorphic effects on the area, and led to the intrusion of the ca. 1.85 to 1.81 Ga Hudson suite monzogranite and mafic ultrapotassic rocks, and ca. 1.83 Ga monzodiorite in the Ukkusiksalik and Douglas Harbour domains. The area is cut by large, southeast-trending gabbro dykes of the 1.267 Ga Mackenzie igneous event.
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Digel, S. G., E. D. Ghent et P. S. Simony. Metamorphism and Structure of the Mount Cheadle area, Monashee Mountains, British Columbia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1989. http://dx.doi.org/10.4095/127454.

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Steenkamp, H. M., N. Wodicka, C. J M Lawley, T. Peterson, W. Garrison, I. Therriault, J. Kendrick, O. M. Weller et V. Tschirhart. Bedrock geology, Daly Bay area, Kivalliq, Nunavut, NTS 56-A, 46-D west, 46-E southwest, and 56-H south. Natural Resources Canada/CMSS/Information Management, 2023. http://dx.doi.org/10.4095/331888.

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New geological mapping in the Tehery Lake-Wager Bay area of northwestern Hudson Bay, Nunavut, frames the emplacement, depositional, and metamorphic histories of the dominant rock types, major structures, and links to neighbouring areas of the central Rae Craton and Chesterfield Block. The area is divided into six domains (Ukkusiksalik, Douglas Harbour, and Gordon domains and Daly Bay Complex presented here, and Lunan and Kummel Lake domains on adjoining maps) defined by large-scale structures and characterized by differing metamorphic assemblages, Sm-Nd and U-Pb isotopic data, and/or specific lithologies. Meso- to Neoarchean granitoid rocks underlie most of the area and are tectonically intercalated with Archean (volcano)sedimentary packages (Kummel Lake, Lorillard, and Paliak belts). These rocks are locally intruded by ca. 2.62 to 2.58 Ga Snow Island suite granite and cut by younger, thin, east-trending diabase dykes. Paleoproterozoic (volcano)sedimentary rocks are preserved in the Kingmirit belt (Daly Bay Complex) and in basement-cover infolds of Ketyet River group-equivalent strata (Douglas Harbour and Ukkusiksalik domains). In the south, the Daly Bay Complex (comprising mostly mafic granulite-facies rocks) and Kummel Lake Domain (a granulite-grade core complex) share some characteristics with rocks of the Kramanituar and Uvauk complexes, which may delineate the northeastern segment of the ca. 1.90 Ga Snowbird tectonic zone. The Paleoproterozoic Trans-Hudson Orogeny had widespread, penetrative structural and metamorphic effects on the area, and led to the intrusion of the ca. 1.85 to 1.81 Ga Hudson suite monzogranite and mafic ultrapotassic rocks, and ca. 1.83 Ga monzodiorite in the Ukkusiksalik and Douglas Harbour domains. The area is cut by large, southeast-trending gabbro dykes of the 1.267 Ga Mackenzie igneous event.
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Steenkamp, H. M., N. Wodicka, C. J M Lawley, T. Peterson, O. M. Weller, J. Kendrick et V. Tschirhart. Bedrock geology, Armit Lake area, Kivalliq, Nunavut, NTS 56-B and 56-C east. Natural Resources Canada/CMSS/Information Management, 2023. http://dx.doi.org/10.4095/331889.

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Résumé :
New geological mapping in the Tehery Lake-Wager Bay area of northwestern Hudson Bay, Nunavut, frames the emplacement, depositional, and metamorphic histories of the dominant rock types, major structures, and links to neighbouring areas of the central Rae Craton and Chesterfield Block. The area is divided into six domains (Gordon, Lunan, and Kummel Lake domains presented here, and Ukkusiksalik and Douglas Harbour domains and Daly Bay Complex on adjoining maps) defined by large-scale structures and characterized by differing metamorphic assemblages, Sm-Nd and U-Pb isotopic data, and/or specific lithologies. Meso- to Neoarchean granitoid rocks underlie most of the area and are tectonically intercalated with Archean (volcano)sedimentary packages (Kummel Lake, Lorillard, and Paliak belts). These rocks are locally intruded by ca. 2.62 to 2.58 Ga Snow Island suite granite and cut by younger, thin, east-trending diabase dykes. Paleoproterozoic (volcano)sedimentary rocks are preserved in the Kingmirit belt (Daly Bay Complex) and in basement-cover infolds of Ketyet River group-equivalent strata (Douglas Harbour and Ukkusiksalik domains). In the south, the Daly Bay Complex (comprising mostly mafic granulite-facies rocks) and Kummel Lake Domain (a granulite-grade core complex) share some characteristics with rocks of the Kramanituar and Uvauk complexes, which may delineate the northeastern segment of the ca. 1.90 Ga Snowbird tectonic zone. The Paleoproterozoic Trans-Hudson Orogeny had widespread, penetrative structural and metamorphic effects on the area, and led to the intrusion of the ca. 1.85 to 1.81 Ga Hudson suite monzogranite and mafic ultrapotassic rocks, and ca. 1.83 Ga monzodiorite in the Ukkusiksalik and Douglas Harbour domains. The area is cut by large, southeast-trending gabbro dykes of the 1.267 Ga Mackenzie igneous event.
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Walker, R. T., et P. S. Simony. Stratigraphy, Structure and Metamorphism of the Mt. Lulu area, Cariboo Mountains, British Columbia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1989. http://dx.doi.org/10.4095/127456.

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Peacock, S. M., K. Wang et A. M. McMahon. Thermal structure and metamorphism of subducting oceanic crust : insight into Cascadia intraslab earthquakes. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2002. http://dx.doi.org/10.4095/222536.

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