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Journal articles on the topic "Mylonite"

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Hanmer, Simon, Randy Parrish, Michael Williams, and Chris Kopf. "Striding-Athabasca mylonite zone: Complex Archean deep-crustal deformation in the East Athabasca mylonite triangle, northern Saskatchewan." Canadian Journal of Earth Sciences 31, no. 8 (August 1, 1994): 1287–300. http://dx.doi.org/10.1139/e94-111.

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The geophysically defined Snowbird tectonic zone is manifested in northernmost Saskatchewan as a deep-crustal, multistage mylonitic structure, the East Athabasca mylonite triangle. The triangle, located at the northeastern apex of a stiff, crustal-scale "lozenge," is composed of mid-Archean annealed mylonites and late Archean ribbon mylonites, formed during two granulite facies events (850–1000 °C, 1.0 GPa). The flow pattern in the mylonites is geometrically and kinematically complex, and corresponds to that expected adjacent to the apex of a stiff elliptical volume subjected to subhorizontal regional extension parallel to its principal axis. The late Archean mylonites are divided into an upper structural deck, entirely occupied by a dip-slip shear zone, and an underlying lower deck. The latter is divided into two upright conjugate strike-slip shear zones, separated by a low-strain septum, which deformed by progressive coaxial flow. The flow pattern in the mid-Archean mylonites is compatible with that of the late Archean mylonites, and suggests that the crustal-scale lozenge influenced deformation since the mid-Archean. In the interval ca. 2.62–2.60 Ga, deformation in the upper and lower decks evolved from a granulite facies pervasive regime to a more localized amphibolite facies regime. With further cooling, deformation was localized within very narrow greenschist mylonitic faults at the lateral limits of the lower deck. By the late Archean, the East Athabasca mylonite triangle was part of a deep-crustal, intracontinental shear zone. This segment of the Snowbird tectonic zone was not the site of an Early Proterozoic suture or orogen.
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Pearson, A., F. Heidelbach, and H. R. Wenk. "Texture Analysis of Quartz in a Granite Mylonite by EBSP-Orientation Imaging Microscopy." Textures and Microstructures 29, no. 3-4 (January 1, 1997): 185–99. http://dx.doi.org/10.1155/tsm.29.185.

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The crystallographic preferred orientation (texture) of the quartz phase in a mylonitic leucogranite from the Santa Rosa mylonite zone was investigated using automated analysis of electron backscattering patterns (EBSP) in the scanning electron microscope (SEM). The separation of the quartz diffraction patterns from patterns of other constituents (feldspar, mica, etc.) in this polymineralic rock was achieved using an image quality parameter. The quartz phase displays a texture typical for high temperature mylonites (c-axis maximum in the intermediate strain direction). The misorientation distribution between next neighbors is dominated by Dauphiné twins.
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V, Thirukumaran, Biswal T.K, Sundaralingam K, Sowmya V, Boopathi S, and Mythili R. "Strain Pattern Analysis of Mylonites From Sitampundi-Kanjamalai Shear Zone, Thiruchengode, South India." International Journal of Civil, Environmental and Agricultural Engineering 1, no. 1 (May 30, 2019): 25–34. http://dx.doi.org/10.34256/ijceae1914.

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This study aims to investigate the petrography and strain pattern of mylonites from parts of N-S trending Sitampundi-Kanjamalai Shear Zone (SKSZ) around Thiruchengode. The petrographic study indicates the presence of recrystallized quartz, K-feldspar, plagioclase, biotite and some hornblende. The kinematic analysis of Mylonites was done with the help of shear sense indicators such as recrystallized type quartz (quartz ribbon) around the cluster of feldspar, S-C fabric shows dextral shear sense and some sinisterly shear sense in some parts of SASZ which can be considered as a product of partitioning of both strain and vorticity between domains. These all indicates the simple shear extension along E-W direction and the mylonitic foliation shows the pure shear compression along N-S direction. Further the study of bulk strain analysis by Flinn plot method using L and T section of mylonite shows k<1 which lies in the field of flattening zone of finite strain. The kinematic vorticity number is calculated by Rxz/β method which gives the value of 0.36 indicating the general shear. The rigid grain graph shows that the pure shear component is more ­­­­dominant than the simple shear component. The analysis leads to the conclusion that the mylonite has experienced a high temperature shearing of above 700°cat deep crustal level.
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Owen, J. V. "Geochemical changes accompanying the mylonitization of diverse rock types from the Grenville Front zone, eastern Labrador." Canadian Journal of Earth Sciences 25, no. 9 (September 1, 1988): 1472–84. http://dx.doi.org/10.1139/e88-140.

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The relationship between mineralogy and bulk composition was examined in mylonites developed in a variety of rock types from the Grenville Front zone of eastern Labrador. Mylonites developed from olivine-, pyroxene-, and (or) amphibole-bearing protoliths are the most altered, typically being enriched in K2O and volatiles and depleted in CaO compared with the protolith. Bulk-compositional modification was accompanied by the formation of almandine-rich garnet and (or) relatively ferruginous hornblende in medium-grade (epidote–amphibolite to lower amphibolite facies) mylonites derived from both mafic and quartzo-feldspathic rocks. Protoliths containing biotite as the principal or sole Fe–Mg phase were the least altered during deformation. Apart from variations in Ti content, biotite in mylonitic assemblages derived from these rocks is compositionally similar to that in the low-strain precursor.Bulk-compositional changes recognized in narrow mylonite zones appear to have occurred in Grenvillian tectonites developed on a regional scale.
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MALATESTA, C., L. FEDERICO, L. CRISPINI, and G. CAPPONI. "Fluid-controlled deformation in blueschist-facies conditions: plastic vs brittle behaviour in a brecciated mylonite (Voltri Massif, Western Alps, Italy)." Geological Magazine 155, no. 2 (January 25, 2017): 335–55. http://dx.doi.org/10.1017/s0016756816001163.

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AbstractA blueschist-facies mylonite crops out between two high-pressure tectono-metamorphic oceanic units of the Ligurian Western Alps (NW Italy). This mylonitic metabasite is made up of alternating layers with different grain size and proportions of blueschist-facies minerals.The mylonitic foliation formed at metamorphic conditions of T = 220–310 °C and P = 6.5–10 kbar. The mylonite shows various superposed structures: (i) intrafoliar and similar folds; (ii) chocolate-tablet foliation boudinage; (iii) veins; (iv) breccia.The occurrence of comparable mineral assemblages along the foliation, in boudin necks, in veins and in breccia cement suggests that the transition from ductile deformation (folds) to brittle deformation (veining and breccia), passing through a brittle–ductile regime (foliation boudinage), occurred gradually, without a substantial change in mineral assemblage and therefore in the overall P–T metamorphic conditions (blueschist-facies).A strong fluid–rock interaction was associated with all the deformative events affecting the rock: the mylonite shows an enrichment in incompatible elements (i.e. As and Sb), suggesting an input of fluids, released by adjacent high-pressure metasedimentary rocks, during ductile deformation. The following fracturing was probably enhanced by brittle instabilities arising from strain and pore-fluid pressure partitioning between adjacent domains, without further external fluid input.Fluids were therefore fixed inside the rock during mylonitization and later released into a dense fracture mesh that allowed them to migrate through the mylonitic horizon close to the plate interface.We finally propose that the fracture mesh might represent the field evidence of past episodic tremors or ‘slow earthquakes’ triggered by high pore-fluid pressure.
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SARKARINEJAD, KHALIL, and SOMAYE DERIKVAND. "Structural and kinematic analyses of the basement window within the hinterland fold-and-thrust belt of the Zagros orogen, Iran." Geological Magazine 154, no. 5 (November 4, 2016): 983–1000. http://dx.doi.org/10.1017/s0016756816000558.

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AbstractThe Zagros hinterland fold-and-thrust belt is located in the central portion of the Zagros Thrust System and consists of the exhumed basement windows associated with NW-striking and NE-dipping flexural duplex structures that contain in-sequence thrusting and related folds. Mylonitic nappes of the basement were exhumed along deep-seated sole thrusts of the Zagros Thrust System. Lattice preferred orientation (LPO) c-axes of quartz show asymmetric type-1 crossed girdles that demonstrate a non-coaxial deformation under plane strain conditions. Based on the opening angles of quartz c-axis fabric skeletons, deformation temperatures vary from 425±50°C to 540±50°C, indicating amphibolite facies conditions. The estimated mean kinematic vorticity evaluated from quartz c-axis of the quartzo-feldspathic mylonites (Wm = 0.55±0.06) indicates the degree of non-coaxiality during mylonite exhumation. The estimated angle θ between the maximum instantaneous strain axis (ISA1) and the transpressional zone boundary is 17°, and the angle of oblique convergence is 57° in the M2 nappe of the basement involved. This indicates that the mylonitic nappe was formed by a combination of 62% pure shear and 38% simple shear during oblique convergence.
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Hanmer, Simon. "Textural map units in quartzo-feldspathic mylonitic rocks." Canadian Journal of Earth Sciences 24, no. 10 (October 1, 1987): 2065–73. http://dx.doi.org/10.1139/e87-195.

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The classical macrotextural subdivision of quartzo-feldspathic mylonitic rocks yields only three rock types: protomylonite, mylonite, and ultramylonite. This restriction impedes detailed mapping of the internal textural transitions common in wide, deep-seated, crustal-scale shear zones, where such transitions may occur over kilometres and involve several clearly mappable textural types. The introduction of two objectively defined field mapping terms, "homoclastic" and "heteroclastic," describing the macroscopic grain-size distribution within the porphyroclast population provides descriptive flexibility without changing the matrix–porphyroclast basis of the established classification. This allows the description of textural paths other than protomylonite → mylonite → ultramylonite and facilitates the consideration of textural paths in terms of strain partitioning between the constituent grains of the deforming aggregate, rather than as a simple function of finite strain.
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Owen, J. Victor. "Determination of the finite-strain ellipsoid from deformed porphyroblastic mineral aggregates and preferentially oriented feldspars in a mylonitized metamafic dyke." Canadian Journal of Earth Sciences 26, no. 11 (November 1, 1989): 2333–40. http://dx.doi.org/10.1139/e89-199.

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Strain in a narrow mylonite zone has been estimated from deformed garnetiferous porphyroblastic aggregates and from preferentially oriented plagioclase porphyroclasts with high aspect ratios. In the undeformed metamafic dyke hosting the mylonite, the mineral aggregates have spheroidal to slightly oblate shapes, and plagioclase is nearly randomly oriented. In the mylonite, the mineral aggregates are prolate ellipsoids, and plagioclase in the aggregates and matrix is symmetrically oriented about the mylonitic planar fabric. Comparison with the radii of spheres of equal volume shows that the ellipsoidal mineral aggregates underwent triaxial strain, with maximum extension of 50–140% parallel to X and with shortening of up to −30 and −45% parallel to Y and Z, respectively. The maximum strain ratio varies between 1.9 and 4.2 (mean of 10 measurements = 3.1). The orientation and aspect ratios of elongate plagioclase grains measured in the X–Z plane indicate an intermediate value (2.7) for the strain ratio. Plagioclase deformation was apparently accommodated by dislocation glide on (010), recovery processes (subgrain rotation), and microcracking. The effects of mechanical anisotropy in plagioclase, however, were subordinate to the strain regime, strain ratio, and initial aspect ratio of grains in determining the final aspect ratio and rest position of these porphyroclasts.Both the deformed garnetiferous aggregates and the plagioclase porphyroclasts record state of strain in the mylonite. This suggests that the preferred orientation of densely packed feldspars of high aspect ratio potentially may be used to estimate strain in tectonites.
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Festa, Vincenzo, Annamaria Fornelli, Francesca Micheletti, Richard Spiess, and Fabrizio Tursi. "Ductile Shearing and Focussed Rejuvenation: Records of High-P (eo-)Alpine Metamorphism in the Variscan Lower Crust (Serre Massif, Calabria—Southern Italy)." Geosciences 12, no. 5 (May 17, 2022): 212. http://dx.doi.org/10.3390/geosciences12050212.

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In the present study, we unveil the real significance of mylonitic reworking of the polymetamorphic crystalline basement in the Serre Massif of Calabria (Southern Italy). We use a multidisciplinary approach to comprehend the structural, microstructural and petrologic changes that occurred along a, so far, not much considered shear zone affecting the Variscan lower crustal rocks. It was never before studied in detail, although some late Cretaceous ages were reported for these mylonites, suggesting that this shear zone is of prime importance. Our observations reveal now that the formation of the new structural fabric within the shear zone was accompanied by changes in mineral assemblages, in a dominant compressive tectonic regime. During this tectono-metamorphic event, high-P mylonitic mineral assemblages were stabilized, consisting of chloritoid, kyanite, staurolite, garnet and paragonite, whereas plagioclase became unstable. Average peak P–T conditions of 1.26–1.1 GPa and 572–626 °C were obtained using THERMOCALC software. These data question (i) that the Serre Massif represents an undisturbed continuous section of the Variscan crust, as generally suggested in the literature, and (ii) highlight the role of (eo-)Alpine high-P tectonics in the Serre Massif, recorded within mylonite zones, where the Variscan basement was completely rejuvenated.
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Farkašovský, Roman, Katarína Bónová, and Marián Košuth. "Microstructural, modal and geochemical changes as a result of granodiorite mylonitisation – a case study from the Rolovská shear zone (Čierna hora Mts, Western Carpathians, Slovakia)." Geologos 22, no. 3 (September 1, 2016): 171–90. http://dx.doi.org/10.1515/logos-2016-0019.

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Abstract Strong tectonic remobilisation and shear zone development are typical features of the easternmost part of the Veporicum tectonic unit in the Western Carpathians. The granodiorite mylonites in the area of the Rolovská shear zone (Čierna hora Mts) underwent a complex polystage evolution during the Hercynian and Alpine orogenies. Deformation during the latter reached greenschist facies under metamorphic conditions. Mylonites are macroscopically foliated rocks with a stretching lineation and shear bands. Structurally different mylonite types, ranging from protomylonites to ulramylonites with typical grainsize reduction from the margins towards the shear zone centre, have been assessed. The modal mineralogy of the different mylonite types changes considerably. Typical is a progressive decrease in feldspar content and simultaneously the quartz and white mica content increases from protomylonites towards the most strongly deformed ultramylonites. The deformation had a brittle character in less deformed rocks and a ductile one in more deformed tectonites. Obvious chemical changes occur in mesomylonites and ultramylonites. During mylonitisation, the original biotite granodiorite was depleted of Mg, Fe, Na, Ca and Ba, while K, Rb and mainly Si increased considerably. Other (major and trace) elements reflect erratic behaviour due to lateral mobility. Chemical changes indicate the breakdown and subsequent recrystallisation of biotite and feldspars and, in turn, the crystallisation of albite and sericite. REE decrease in ultramylonites due to the breakup of accessory minerals during deformation and alteration.
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Dissertations / Theses on the topic "Mylonite"

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Bretan, P. G. "Deformation processes within mylonite zones associated with some fundamental faults." Thesis, Imperial College London, 1986. http://hdl.handle.net/10044/1/37954.

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Maurel, Olivier. "L'exhumation de la zone axiale des Pyrénées-Orientales une approche thermo-chronologique multi-méthodes du rôle des failles /." Montpellier : Institut des sciences de la terre, de l'environnement et de l'espace de Montpellier, 2003. http://catalogue.bnf.fr/ark:/12148/cb401527828.

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Point, Raymond. "La lame cratonique et les unités supracrustales de la chaîne calédonienne scandinave méridionale orientale : un exemple d'évolution polycyclique de mylonites précambriennes." Paris 7, 1990. http://www.theses.fr/1990PA077217.

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Dans les caledonides orientales scandinaves, l'etude des roches impliquees dans les deux nappes situees a la base de la grande nappe de seve, permet de definir deux grandes unites formees de mylonites heterogenes et polycycliques: 1) a la base, la lame cratonique, unite formee de lames de socle cristallin mylonitique a lithologie variee parmi lesquelles les orthogneiss de tannas representent une part importante en volume; 2) au-dessus, la nappe de sarv-humelfjell, unite de roches supracrustales formee de lames de tectonites ultramylonitiques et protomylonitiques a facies de pseudo-metaquartzite. Ces nappes contiennent en intercalation et en faible quantite, des marbres et des sediments periglaciaires d'age inconnu. L'analyse petrographique et structurale, les relations avec les filons basiques secants, permettent de separer une evolution crustale cisaillante et heterogene, catazonale a epizonale, datant de la fin de l'orogenese svecofennienne, d'une evolution crustale cisaillante et heterogene, strictement epizonale, rapportee a l'orogenese caledonienne. La diversite des facies des mylonites est expliquee a partir de l'etude de la mineralogie des roches structurees ou mises en place dans les zones profondes et, l'heterogeneite des deformations, par la distribution spatiale des zones de cisaillement qui se relaient dans le temps et dans l'espace au cours de l'evolution retrograde datant du premier episode. L'origine des roche-meres des mylonites cristallines et para-derivees les plus typiques est precisee. Une etude comparative entre les roches supracrustales et les sediments varegiens est abordee. Les resultats geochimiques rendent compte de la structuration en zone profonde. Ils permettent aussi de mettre en evidence des migrations metasomatiques d'elements majeurs lies a l'orogenese caledonienne. Ces nappes sont considerees comme des nappes de socle. Ce sont des nappes polycy
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Papa, Simone. "The pseudotachylyte-­mylonite association: an insight into the mechanics of deep earthquakes." Doctoral thesis, Università degli studi di Padova, 2019. http://hdl.handle.net/11577/3425421.

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The aim of this thesis is to investigate the association of fault rocks formed by seismic deformation with coeval ductile deformation. The only recognised geological record of these two concurrent deformation mechanisms is represented by the relationship between coeval pseudotachylytes (quenched melts produced during seismic slip) and mylonites (high-­‐strain rocks deformed in high-temperature ductile flow). The scientific importance of this association of rocks lies in the fact that their existence in rocks exhumed from below the long-­‐term brittle/ductile transition is a compelling evidence that rheology of the deep crust cannot be treated simply in terms of brittle and ductile models. By investigating associations of coeval pseudotachylytes and mylonites we aim at giving an original and meaningful contribution to the understanding of the mechanisms involved in the interplay in space and time between seismic deformation and ductile flow. A model proposed to explain such association of fault rocks is “self-­‐localising thermal runaway”, assuming a spontaneous acceleration of localized slip in a ductile shear zone eventually leading to seismic slip and melting. This model is supported by numerical modelling, but its application to nature is disputed and speculative. We analyse a pseudotachylyte-­ultramylonite association in exhumed lower crustal, quartz-­‐rich metapelites from the Mont Mary nappe of the Western Italian Alps, representing a possible candidate for thermal runaway instability, to find evidence in support or against this process. • We document by detailed electron backscatter diffraction (EBSD) analysis of quartz-­‐rich layers, the progressive microstructural evolution, at nearly constant temperature conditions (550 °C), to high differential stresses (> 200 MPa) and high strain rates (10-­‐9 s-­‐1) within the most strongly deformed portions of the ultramylonite hosting the pseudotachylyte. This microstructural evolution is associated with a switch in deformation mechanism from grain-­size-insensitive to grain-­size-­sensitive creep assisted by grain boundary sliding and creep cavitation. These latest recorded stages of deformation were still aseismic, as the rate-­controlling process was precipitation of oriented biotite in cavitation pores. • We calculate, by calibrated numerical models, the critical conditions for thermal runaway instability in quartz for a wide range of temperature/strain-­‐rate combinations, and determine that deformation in the studied ultramylonite occurred close to the conditions for the instability to occur. At the same time, we estimate that deformation occurred proximal to brittle-­ductile transition for such high strain rates. • We conclude that the observed pseudotachylyte-­mylonite association is best explained by transient downward propagation of seismic rupture from the nearby, overlying base of the seismogenic crust; or by earthquake nucleation below the long-­term brittle/ductile transition permitted by the downward deflection of the transition after a large seismic event in the upper crust. Based on the study of wall-­rock garnet coseismic fragmentation in the Mont Mary pseudotachylyte-­ultramylonite and on garnet preferential melting within the pseudotachylyte, we suggest a general process for garnet disappearance due to thermal shock fragmentation during co-­seismic frictional heating. We show that garnet has the lowest thermal shock resistance between the host rock minerals (garnet, plagioclase, quartz, and sillimanite, in an increasing sequence of resistance), and thus underwent extreme comminution leading to total melting within the frictional melt. Our analysis highlights the critical role of thermal shock as a general process in mineral comminution during the initial stages of co-seismic slip preceding (and promoting) extensive frictional melting. We also present the preliminary results (mechanical and microstructural) of rotary shear experiments designed to reproduce the formation of Mont Mary pseudotachylytes in the lab. We extend the study of deep crustal pseudotachylytes and pseudotachylyte-­mylonite associations to the Calabrian lower crust (Southern Italy) in a preliminary study that aims at paving the way to a further in-­depth analysis of Calabrian pseudotachylytes, which represent a unique information source about the rheology of the granulitic continental lower crust. We present microstructural evidence for cyclic pseudotachylyte and mylonite development in the dry lower crust and document the first finding of low-­‐p/high T, cordierite-­bearing, peraluminous pseudotachylytes featuring sillimanite microlites.
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Stewart, Martyn. "Kinematic evolution of the Great Glen Fault Zone, Scotland." Thesis, Oxford Brookes University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364096.

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Parsons, Martha Mary. "Field and Microstructural Constraints on Deformation Conditions and Shear Zone Kinematics in the Burlington Mylonite Zone, Massachusetts:." Thesis, Boston College, 2017. http://hdl.handle.net/2345/bc-ir:107375.

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Thesis advisor: Seth C. Kruckenberg
The Burlington Mylonite Zone (BMZ) is a northeast-trending, greenschist- to amphibolite-facies shear zone located entirely within the Boston Avalon terrane in Eastern Massachusetts along the tectonic boundary with the Nashoba terrane (the trailing marginal terrane of Ganderia). The juxtaposition of these terranes, and the development of the BMZ, is hypothesized to represent the amalgamation of Avalon and Laurentia during the late Silurian-early Devonian Acadian orogeny, but the timing of its formation and its structural evolution remain largely unconstrained. Field observations and microstructural analysis using electron backscatter diffraction (EBSD) of 24 samples from 16 field sites throughout the BMZ provide new constraints on the kinematics and conditions of deformation that facilitated the development of this large-scale crustal shear zone. The BMZ samples comprise a heterogeneous mix of quartzofeldspathic +/- hornblende-bearing gneisses and quartzites with varying microstructures. Nearly all samples contain abundant mixed, but predominantly sinistral, kinematic indicators (e.g., asymmetric porphyroclasts, tiled feldspars) and a strong crystallographic preferred orientation (CPO). Quartz – the dominant mineral by mode in all of the samples analyzed – is known from experimental deformation studies to develop distinct patterns of CPO which vary as a function of deformation kinematics, temperature, and strain geometry. Patterns of CPO in quartz are used to determine the dominant intracrystalline deformation mechanisms that accommodated the formation of the BMZ. Quartz CPO patterns in the BMZ samples are characterized by variably developed c- and a-axis distributions, broadly consistent with patterns expected for mixed to prism slip at intermediate temperatures of deformation. Corresponding intragranular misorientation axis plots are more diagnostic and indicate dominant prism slip in all of the shear zone samples analyzed, consistent with microstructures observed in thin section (e.g., undulose extinction, subgrain development, grain boundary migration, dynamic recrystallization) and metamorphic conditions inferred from shear zone mineral parageneses. Application of the quartz recrystallized grain size piezometer places additional constraints on deformation conditions, indicating that the BMZ rocks record differential stresses ranging from ~44 to 92 MPa. Field and microstructural observations of shear sense indicators are combined with two analytical methods for determining aspects of kinematic vorticity and deformation geometry in the BMZ. This study applies a new analytical method - crystallographic vorticity axis (CVA) analysis - that leverages rotational statistics on crystallographic orientations within the interiors of grains to constrain the dominant axis of material rotation in deformed samples. This dominant axis provides a uniquely objective proxy for the vorticity normal reference frame required for further quantitative kinematic vorticity analyses. The rotational axis of kinematic vorticity, and its relationship to structural fabrics (i.e. foliation and lineation), provides an important constraint on the geometry of the deforming zone (e.g., monoclinic versus triclinic shear zones). The results of the CVA analysis are invariable across the entire length of the BMZ; the kinematic vorticity axis lies within the plane of mylonitic foliation perpendicular to lineation – the pattern expected for monoclinic deformation geometries. The mean kinematic vorticity number (Wm: a measure of the relative contribution of pure and simple shear) is calculated using Rigid Grain Net (RGN) analysis for the BMZ mylonites and ranges from 0.4-0.5, indicating general shear. Combined field, microstructural, and vorticity analyses are interpreted to suggest that crustal strain localization along the Avalon-Nashoba boundary, as recorded in the BMZ mylonites, involved the combined effects of pure and simple shear in a predominantly sinistral, monoclinic transpressional shear zone. Rock microstructures, patterns of crystallographic preferred orientation, and paleostress estimates suggest that mylonitization occurred at or near the brittle-ductile transition under relatively high stress conditions. This study demonstrates the power of new microstructural methods, such as CVA analysis of electron backscatter diffraction data, to augment traditional field-based methods of kinematics and deformation analysis in enigmatic, large-scale crustal shear zones
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Loehn, Clayton William. "Monazite Geochronology of the Madison Mylonite Zone and Environs, Southwestern Montana: With Implications for Precambrian Thermotectonic Evolution of the Northern Wyoming Province." Thesis, Virginia Tech, 2009. http://hdl.handle.net/10919/31692.

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Neoarchean thermotectonism at in the northern Wyoming province is preserved in metamorphic zircon rims and monazite growth throughout the Snowy shear zone (SSZ) and the Madison mylonite zone (MMZ), South Madison Range, Montana. Comparison of U-Pb and U-Th-Pb ages yielded by monazite grains from both shear zones and zircon rims from SSZ, a new timing for major SE-directed thrusting and formation of the MMZ and SSZ has been identified at ~2550 Ma. The collinearity of these two shears indicates the formation of a much larger single shear zone that extends from the North Snowy block (NE), Beartooth Mountains, through the South Madison range (SW), and is paralleled to the immediate NW by the Mirror Lake and Big Brother shear zones. A detrital zircon study of two quartzites, from the westernmost North Snowy block units, yielded concordant age populations ranging in age from 3556 ± 10 to 2752 ± 9 Ma indicating that these sediments were derived either from older crust located in the Beartooth Mountains or from another source that was relatively close to the region prior to ~2750 Ma. The youngest magmatic zircon core found among these quartzites yielded a U-Pb age of 2690 ± 12 Ma, setting a new maximum age for sandstone deposition, additionally 10 metamorphic zircon rims and one monazite grain provide a new minimum U-Pb age of deposition and metamorphism at 2545 ± 2 Ma. Driving forces behind the ~2550 Ma SE-directed thrusting in the NW Wyoming craton may have been the final stages of supercontinent Kenorland assembly, whereas the ~2450 Ma reactivation, recorded by monazite rim growth, along the SSZ-MMZ may relate to the incipient supercontinent break-up, which has been suggested to have occurred at about this time by other studies.
Master of Science
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Mehl, Luc. "Plagioclase preferred orientation in the layered mylonites : evaluation of flow laws for the lower crust." Thesis, Online version of original thesis, 2008. http://hdl.handle.net/1912/2324.

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Jarrett, Corey. "Analysis of an Exposed Portion of the Badwater Turtleback Shear-zone, Death Valley, California, USA." Thesis, University of Oregon, 2018. http://hdl.handle.net/1794/23181.

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The exposed shear zone within the footwall of the Badwater turtleback presents an excellent opportunity to explore the brittle-ductile transition. Within this shear zone, a variety of lithologies preserve the last stages of crystal-plastic deformation concurrent with exhumation of the turtleback. The included field study captures a snapshot of each lithologic element during the last stages of ductile deformation. The exposed shear zone's journey through the brittle-ductile transition is analyzed using the deformation mechanisms of calcite and quartz. A history of strain partitioning is constructed through comparison of the strain and temperature environments needed to facilitate each mechanism of crystal-plastic deformation. As the shear zone cooled, strain was partitioned from quartz-rich mylonitic gneiss to the calcite-dominated marbles and mylonites. Correlation of deformation temperatures with previous studies further constrains the timing of the last stage of ductile deformation to between 13 and 6 Ma.
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Tatarin, Triffon Joseph, and Triffon Joseph Tatarin. "Interrelationships of cataclasite, mylonite, and leucocratic bodies associated with the Catalina detachment fault, dual wash area, Saguaro National Park east, Rincon Mountains." Thesis, The University of Arizona, 2017. http://hdl.handle.net/10150/626821.

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The Dual Wash area is comprised of two west-northwest-trending washes (Deer Valley and Carillo), which provide excellent cross-section exposures of metamorphic core complex fault rock units. The structural components of metamorphic core complexes consist of upper plate rocks, a detachment fault, cataclasite and chlorite breccia, subdetachment fault, and mylonites. Within the Carillo Wash, the Catalina detachment fault dips ~13° NW, which is consistent with its overall dip in this part of the Rincon Mountains. However, exposed along the Deer Valley Wash, the Catalina detachment fault dips more steeply at ~60° NW. Beneath the detachment fault, in the lower plate, the structurally highest rock is a highly-fractured chlorite cataclasite which lies above two different units of mylonites. Embedded in these unit is leucocratic granitic unit which floods the cataclasite and mylonites. Evidence of brittle faulting and fracturing show evidence of this being a late-stage intrusion. The structural geology of the Dual Wash area proves to be somewhat structurally anomalous. The cause for much of these anomalies within the lower plate may be credited to the presence of this abundant leucogranite unit. This may be because it is a late-stage intrusion as well as a potential driver of core complex development.
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Books on the topic "Mylonite"

1

Hanmer, Simon. Geology of the Striding-Athabasco mylonite zone, northern Saskatchewan and southeastern District of Mackenzie, Northwest Territories. Ottawa: Geological Survey of Canada, 1997.

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Passchier, C. W. (Cees W.), 1954-, Wiersma Dirk J. 1939-, and SpringerLink (Online service), eds. Atlas of Mylonites - and related microstructures. Berlin, Heidelberg: Springer-Verlag Berlin Heidelberg, 2010.

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Fliervoet, Timon F. Deformation mechanisms in fine grained quartzo-feldspathic mylonites: An electron microscopy study. [Utrecht: Faculteit Aardwetenschappen, Universiteit Utrecht, 1995.

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Hanmer, Simmon. Geology of the Striding-Athabasca mylonite zone, northern Saskatchewan and southestern District of MacKenzie, Northwest Territories. Ottawa, Ont: Geological Survey of Canada, 1997.

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Trouw, Rudolph A. J., Cees W. Passchier, and Dirk J. Wiersma. Atlas of Mylonites- and related microstructures. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-03608-8.

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United States. National Aeronautics and Space Administration., ed. P-T conditions of deformation from fluid inclusions in mylonites. College Park, MD: Dept. of Geology, University of Maryland, 1990.

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J, Parker A., and Geological Society of Australia. Specialist Group in Tectonics and Structural Geology., eds. Archaean - early proterozoic granitoids, metasediments and mylonites of Southern Eyre Peninsula, South Australia. Sydney, Australia: Geological Society of Australia, 1988.

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Fault-related rocks: A photographic atlas. Princeton, N.J: Princeton University Press, 1998.

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Todd, Victoria R., Arthur W. Snoke, and Jan Tullis. Fault-Related Rocks: A Photographic Atlas. Princeton University Press, 2014.

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Todd, Victoria R., Arthur W. Snoke, and Jan Tullis. Fault-Related Rocks: A Photographic Atlas. Princeton University Press, 2016.

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Book chapters on the topic "Mylonite"

1

Trouw, Rudolph A. J., Cees W. Passchier, and Dirk J. Wiersma. "Protomylonite, Mylonite and Ultramylonite." In Atlas of Mylonites- and related microstructures, 101–12. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-03608-8_7.

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Salda, L. H. Dalla, J. R. Franzese, and V. G. de Posadas. "The 1,800 Ma Mylonite-Anatectic Granitoid Association in Tandilia, Argentina." In Proceedings of the International Conferences on Basement Tectonics, 161–74. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-017-0833-3_12.

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Knipe, R. J., and R. P. Wintsch. "Heterogeneous Deformation, Foliation Development, and Metamorphic Processes in a Polyphase Mylonite." In Metamorphic Reactions, 180–210. New York, NY: Springer New York, 1985. http://dx.doi.org/10.1007/978-1-4612-5066-1_7.

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Takahashi, Yutaka. "Geotectonic evolution of the Nihonkoku Mylonite Zone of north central Japan based on geology, geochemistry, and radiometric ages of the Nihonkoku Mylonites." In Ductile Shear Zones, 270–92. Chichester, UK: John Wiley & Sons, Ltd, 2015. http://dx.doi.org/10.1002/9781118844953.ch16.

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Li, Jianhong, and Liang Liang. "Features of mylonite and its relationship to uranium ore-formation in the Xiazhuang uranium ore field." In Mineral Deposit Research: Meeting the Global Challenge, 285–87. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/3-540-27946-6_74.

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Trouw, Rudolph A. J., Cees W. Passchier, and Dirk J. Wiersma. "“False” mylonites." In Atlas of Mylonites- and related microstructures, 263–72. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-03608-8_11.

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Trouw, Rudolph A. J., Cees W. Passchier, and Dirk J. Wiersma. "Low-Grade Mylonites." In Atlas of Mylonites- and related microstructures, 45–72. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-03608-8_4.

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Trouw, Rudolph A. J., Cees W. Passchier, and Dirk J. Wiersma. "Medium-Grade Mylonites." In Atlas of Mylonites- and related microstructures, 73–86. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-03608-8_5.

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Trouw, Rudolph A. J., Cees W. Passchier, and Dirk J. Wiersma. "High-Grade Mylonites." In Atlas of Mylonites- and related microstructures, 87–99. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-03608-8_6.

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Trouw, Rudolph A. J., Cees W. Passchier, and Dirk J. Wiersma. "Introduction." In Atlas of Mylonites- and related microstructures, 1–6. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-03608-8_1.

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Conference papers on the topic "Mylonite"

1

Mako, Calvin A. "SHEAR HEATING IN THE SANDHILL CORNER MYLONITE ZONE, MAINE." In 53rd Annual GSA Northeastern Section Meeting - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018ne-310944.

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Cubrich, Bart T., Kevin R. Chamberlain, Ernest M. Duebendorfer, Michael L. Williams, and Jeffre W. Hamlin. "THE PALEOPROTEROZOIC MYLONITE OF KINGS CANYON, COLORADO: A CA. 1.6 GA GREENSCHIST FACIES MYLONITE FAR TO THE NORTH OF THE CONCURRENT ACTIVE TECTONIC MARGIN." In Joint 70th Annual Rocky Mountain GSA Section / 114th Annual Cordilleran GSA Section Meeting - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018rm-314204.

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Hurich, Charles A., Scott B. Smithson, David M. Fountain, and Michael C. Humphreys. "Seismic evidence of mylonite reflectivity in the Kettle dome metamorphic core complex." In 1985 SEG Technical Program Expanded Abstracts. SEG, 1985. http://dx.doi.org/10.1190/1.1892624.

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Jarrett, Corey B., Marli B. Miller, and Nancy A. Price. "MYLONITE MÉLANGE IN AN EXTENSIONAL SHEAR-ZONE: A DESCRIPTIVE HISTORY AND STRAIN ANALYSIS." In GSA Annual Meeting in Seattle, Washington, USA - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017am-298506.

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Yager, Kristie, Adam Ketchum, Sara E. Bier, Christian Shrader, and Sam Wilson. "KINEMATIC HISTORY OF THE CLARE MYLONITE IN THE NORTHWEST ADIRONDACKS: STRUCTURAL AND PETROGRAPHIC ANALYSIS." In 53rd Annual GSA Northeastern Section Meeting - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018ne-310970.

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Cawood, Tarryn Kim, Scott Paterson, Barbara C. Ratschbacher, Alexander Dmitri Johnston Lusk, Mariano A. Larrovere, Pablo Alasino, Christopher Benton Rick, and Valbone Memeti. "STRAIN (DE)-LOCALIZATION IN THE ~10KM WIDE CUESTA DE RANDOLFO MYLONITE ZONE, FAMATINIAN ARC." In GSA Annual Meeting in Seattle, Washington, USA - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017am-302442.

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St. Denny, John Russell, and Erkan Toraman. "DECIPHERING DEFORMATION CONDITIONS ALONG THE CARTHAGE-COLTON MYLONITE ZONE, NW ADIRONDACKS, BASED ON FELDSPAR MICROSTRUCTURES." In GSA Annual Meeting in Seattle, Washington, USA - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017am-300057.

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Jarrett, Corey B., Marli B. Miller, and Nancy A. Price. "MYLONITE MELANGES IN AN EXTENSIONAL SHEAR-ZONE IN THE BADWATER TURTLEBACK OF DEATH VALLEY, CALIFORNIA." In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-283136.

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Baldassarre, Genna, Gary Solar, and Paul B. Tomascak. "FABRIC ANALYSIS IN MYLONITE IN THE NORUMBEGA SHEAR ZONE SYSTEM, FREEPORT-HARPSWELL AREA, SOUTHERN MAINE." In Northeastern Section-56th Annual Meeting-2021. Geological Society of America, 2021. http://dx.doi.org/10.1130/abs/2021ne-361917.

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Tjapkes, Daniel J., Kaitlyn A. Suarez, Michael J. Jercinovic, and Michael L. Williams. "MONAZITE PETROCHRONOLOGY OF ADIRONDACK LOWLANDS MIGMATITES: IMPLICATIONS FOR THE SIGNIFICANCE OF THE CARTHAGE-COLTON MYLONITE ZONE." In GSA 2020 Connects Online. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020am-358741.

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Reports on the topic "Mylonite"

1

Hanmer, S. Geology, East Athabasca Mylonite Triangle, Saskatchewan. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1994. http://dx.doi.org/10.4095/194845.

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Tribe, S. Kunghit Island mylonite of the southern Louscoone Inlet fault system, Queen Charlotte Islands, British Columbia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1993. http://dx.doi.org/10.4095/184088.

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Hanmer, S. Geology of the Striding-Athabasca mylonite zone, northern Saskatchewan and southeastern District of Mackenzie, Northwest Territories. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1997. http://dx.doi.org/10.4095/209170.

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Hanmer, S., M. Darrach, and C. Kopf. The east Athabasca Mylonite Zone: an Archean segment of the Snowbird Tectonic Zone in Nortern Saskatchewan. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1992. http://dx.doi.org/10.4095/132845.

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Tella, S., J. C. Roddick, and W. Davis. Geochronological constraints on the multiple displacement history of the Amer Mylonite Zone, Churchill structural province, District of Keewatin, Northwest Territories, Canada. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1998. http://dx.doi.org/10.4095/209479.

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Hanmer, S. K. Granulite Facies Mylonites: a Brief Structural Reconnaissance North of Stony Rapids, northern Saskatchewan. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1987. http://dx.doi.org/10.4095/122557.

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van Breemen, O., S. K. Hanmer, and R. R. Parrish. Archean and proterozoic mylonites along the southeastern margin of the Slave Structural Province, Northwest Territories. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1990. http://dx.doi.org/10.4095/129070.

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Murphy, D. C. Direct Evidence For Dextral Strike - Slip Displacement From Mylonites in the southern Rocky Mountain Trench near Valemount, British Columbia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1990. http://dx.doi.org/10.4095/131373.

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