Готові списки джерел за темами / P–T pseudosection

Добірка наукової літератури з теми "P–T pseudosection"

Автор: Grafiati

Опубліковано: 10 грудня 2022

Оновлено: 28 січня 2023

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Статті в журналах з теми "P–T pseudosection"

N.Jowhar, T. "Computer Programs for P-T History of Metamorphic Rocks using Pseudosection Approach." International Journal of Computer Applications 41, no. 8 (March 31, 2012): 18–25. http://dx.doi.org/10.5120/5561-7639.

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Cheng, H., and D. Cao. "Protracted garnet growth in high-P eclogite: constraints from multiple geochronology and P-T pseudosection." Journal of Metamorphic Geology 33, no. 6 (July 6, 2015): 613–32. http://dx.doi.org/10.1111/jmg.12136.

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Zuluaga, C. A. "The effect of zoned garnet on metapelite pseudosection topology and calculated metamorphic P-T paths." American Mineralogist 90, no. 10 (October 1, 2005): 1619–28. http://dx.doi.org/10.2138/am.2005.1741.

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Volkova, N. I., E. I. Mikheev, A. V. Travin, A. G. Vladimirov, A. S. Mekhonoshin, and V. V. Khlestov. "P–T CONDITIONS, U/Pb AND 40Ar/39Ar ISOTOPIC AGES OF UHT GRANULITES FROM CAPE KALTYGEI, WESTERN BAIKAL REGION." Geodynamics & Tectonophysics 12, no. 2 (June 23, 2021): 310–31. http://dx.doi.org/10.5800/gt-2021-12-2-0526.

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The study is focused on metapelitic granulites of Cape Kaltygei (Western Baikal region) that contain a diagnostic mineral assemblage of ultrahigh temperature (UHT) metamorphic rocks (orthopyroxene+sillimanite+quartz). The pseudosection-based thermobarometry yields peak metamorphic temperature and pressure values (T=950 °C, P=~9 kbar) and suggests near-isobaric cooling (IBC) conditions during the retrograde evolution of the granulites. The U/Pb zircon age estimates for metamorphism (~1.87 Ga) support the data published by other researchers. The SHRIMP-II U-Pb dating of zircon cores yields a minimum protolith age of 1.94–1.91 Ga. Biotites and amphiboles from granulites of Cape Kaltygei show the 40Ar/39Ar isotopic ages that are close to the Early Paleozoic accretion-collision system of the Western Baikal region.

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Cruciani, G., M. Franceschelli, and H. J. Massonne. "Low-temperature metamorphic evolution of a pre-Variscan gabbro: a case study from the Palaeozoic basement of northwest Sardinia, Italy." Mineralogical Magazine 75, no. 6 (December 2011): 2793–812. http://dx.doi.org/10.1180/minmag.2011.075.6.2793.

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AbstractA lenticular metagabbro crops out in an early Palaeozoic metasedimentary sequence at Nurra, northwest Sardinia. The metagabbro consists of variable proportions of early-formed coarse-grained albite, chlorite, epidote and apatite, later biotite and amphibole, and late stilpnomelane. Clinopyroxene and ilmenite are rare relict igneous minerals; albite has completely replaced primary plagioclase.The metamorphic evolution of the Nurra metagabbro has been investigated by pseudosection modelling for a fixed bulk-rock composition in the Na2O—CaO—K2O—FeO—MgO—A12O3—SiO2—H2O (NCKFMASH) model system with added Ti and Mn in the P-T range 1-11 kbar and 150-450°C. The P—T path of the metagabbro is a loop with a prograde segment overprinted by later metamorphic re-equilibration. The pressure peak was at ⩽7 kbar and ∼400°C. The subsequent temperature peak, at ∼440°C, was accompanied by a decrease in pressure to ∼3 kbar. The final P—T evolution of the metagabbro is characterized by near-isobaric cooling to 250—300°C, with the formation of stilpnomelane. The P—T path of the Nurra gabbro is typical of continental orogenic belts that have undergone crustal thickening.

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de Hoÿm de Marien, Luc, Pavel Pitra, Florence Cagnard, and Benjamin Le Bayon. "Prograde and retrograde P–T evolution of a Variscan high-temperature eclogite, French Massif Central, Haut-Allier." BSGF - Earth Sciences Bulletin 191 (2020): 14. http://dx.doi.org/10.1051/bsgf/2020016.

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The P–T evolution of a mafic eclogite sample from the Haut-Allier was studied in order to constrain the dynamic of the Variscan subduction in the eastern French Massif Central. Three successive metamorphic stages M1, M2 and M3, are characterized by assemblages comprising garnet1-omphacite-kyanite, garnet2-plagioclase, and amphibole-plagioclase, respectively, and define a clockwise P–T path. These events occurred at the conditions of eclogite (M1; ∼ 20 kbar, 650 °C to ∼ 22.5 kbar, 850 °C), high-pressure granulite (M2; 19.5 kbar and 875 °C) and high-temperature amphibolite facies (M3; < 9 kbar, 750–850 °C), respectively. Pseudosection modelling of garnet growth zoning and mineralogy of the inclusions reveal a prograde M1 stage, first dominated by burial and then by near isobaric heating. Subsequent garnet1 resorption, prior to a renewed growth of garnet2 is interpreted in terms of a decompression during M2. High-pressure partial melting is predicted for both the M1 temperature peak and M2. M3 testifies to further strong decompression associated with limited cooling. The preservation of garnet growth zoning indicates the short-lived character of the temperature increase, decompression and cooling cycle. We argue that such P–T evolution is compatible with the juxtaposition of the asthenosphere against the subducted crust prior to exhumation driven by slab rollback.

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Nasipuri, P., A. Bhattacharya, and S. Das. "Metamorphic reactions in dry and aluminous granulites: a Perple_X P–T pseudosection analysis of the influence of effective reaction volume." Contributions to Mineralogy and Petrology 157, no. 3 (September 4, 2008): 301–11. http://dx.doi.org/10.1007/s00410-008-0335-8.

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Tiwari, Ashish Kumar, and Tapabrato Sarkar. "P-T-t evolution of sapphirine-bearing semipelitic granulites from Vadkampatti in Eastern Madurai Domain, southern India: Insights from petrography, pseudosection modelling and in-situ monazite geochronology." Precambrian Research 348 (September 2020): 105866. http://dx.doi.org/10.1016/j.precamres.2020.105866.

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Holmberg, Johanna, Michał Bukała, Pauline Jeanneret, Iwona Klonowska, and Jarosław Majka. "Decompressional equilibration of the Midsund granulite from Otrøy, Western Gneiss Region, Norway." Geologica Carpathica 70, no. 6 (December 1, 2019): 471–82. http://dx.doi.org/10.2478/geoca-2019-0027.

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Abstract The Western Gneiss Region (WGR) of the Scandinavian Caledonides is an archetypal terrain for high-pressure (HP) and ultrahigh-pressure (UHP) metamorphism. However, the vast majority of lithologies occurring there bear no, or only limited, evidence for HP or UHP metamorphism. The studied Midsund HP granulite occurs on the island of Otrøy, a locality known for the occurrence of the UHP eclogites and mantle-derived, garnet-bearing ultramafics. The Midsund granulite consists of plagioclase, garnet, clinopyroxene, relict phengitic mica, biotite, rutile, quartz, amphibole, ilmenite and titanite, among the most prominent phases. Applied thermodynamic modelling in the NCKFMMnASHT system resulted in a pressure–temperature (P–T) pseudosection that provides an intersection of compositional isopleths of XMg (Mg/Mg+Fe) in garnet, albite in plagioclase and XNa (Na/Na+Ca) in clinopyroxene in the stability field of melt + plagioclase + garnet + clinopyroxene + amphibole + ilmenite. The obtained thermodynamic model yields P–T conditions of 1.32–1.45 GPa and 875–970 °C. The relatively high P–T recorded by the Midsund granulite may be explained as an effect of equilibration due to exhumation from HP (presumably UHP) conditions followed by a period of stagnation under HT at lower-to-medium crustal level. The latter seems to be a more widespread phenomenon in the WGR than previously thought and may well explain commonly calculated pressure contrasts between neighboring lithologies in the WGR and other HP–UHP terranes worldwide.

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Tropper, Peter, and Christoph Hauzenberger. "How well do pseudosection calculations reproduce simple experiments using natural rocks: an example from high-P high-T granulites of the Bohemian Massif." Austrian Journal of Earth Sciences 108, no. 1 (2015): 123–38. http://dx.doi.org/10.17738/ajes.2015.0008.

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Дисертації з теми "P–T pseudosection"

Tamblyn, R. J. "Eclogite and blueschist in the southern New England Fold Belt: P–T–t conditions and long-lived subduction on the Gondwanan eastern margin." Thesis, 2016. http://hdl.handle.net/2440/121350.

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Eclogite and blueschist in the Tasminides represent clear evidence for subduction-related metamorphism on the Gondwanan eastern margin during the Palaeozoic. These eclogites and blueschists are located in the serpentinite-bearing Peel Manning Fault System in the Southern New England Fold Belt (SNEFB) of eastern Australia. U–Pb zircon and Lu–Hf and Sm–Nd multimineral geochronology give ages of ca. 490 Ma for lawsonite-bearing eclogite and ca. 470 Ma for garnet-bearing blueschist at Port Macquarie in the SNEFB, in agreement with Cambro-Ordovician dates for eclogite metamorphism across the eastern Gondwanan margin. In combination with this, Ar–Ar data dates exhumation and cooling in the subduction channel at ca. 460 Ma, suggesting that high-pressure metamorphism at Port Macquarie was continuously active for upwards of 40 Ma. This is supported by mineral equilibria forward modeling, which demonstrates that 24–27 kbar eclogite from Port Macquarie and Pigna Barney in the SNEFB experienced high-pressure but low-temperature retrograde paths, consistent with their residence in the subduction channel. Geochemical and isotopic results suggest that MORB as well as oceanic arc-related material was subducted and metamorphosed in a westwards dipping subduction system on the Australian cratonic margin during the ca. 515–490 Ma Delamerian Orogeny, and subsequently entrapped in the subduction channel during rollback. This rollback resulted in the development of a large backarc system on the upper plate in which the protoliths to the Lachlan Orogen accumulated, as well as on-going blueschist-facies metamorphism in the subduction channel. Ultimately, rollback led to translocation of subduction products and their exhumation over 2000 km eastwards to their current position in the New England orogen. In contrast to this, further south in Tasmania and Antarctica, the subduction of continental material led to rapid burial and exhumation of eclogite, representing differing styles of Cambro-Ordovician high-pressure metamorphism on the eastern Gondwanan margin.
Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Sciences, 2016

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Dupavillon, P. R. "Metamorphic evolution of the western Gawler Craton." Thesis, 2015. http://hdl.handle.net/2440/118006.

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The tectonothermal evolution of the western Gawler Craton, including the Fowler Domain, during Proterozoic Australia is currently poorly understood. In-situ U-Pb ages obtained in this study from the Fowler Domain yielded ages of metamorphism at c. 1732–1701 Ma attributed to the Kimban Orogeny, and at c. 1599 Ma attributed to Kararan/Hiltiba events. Quantitative phase equilibria modelling, i.e. pressure-temperature pseudosections, provide the first modern metamorphic constraints on pressure–temperature conditions for two areas within the Fowler Domain and are ~2.6–7.4 kbar and 550– 700°C for the Barton Block, and 8.2–8.7 kbar and 450– 475°C for the Nundroo Block which equate to apparent thermal gradients of approximately ~116–135°C /kbar and ~50–60 °C/kbar respectively. These thermal gradients occur within the hotter part of the ‘high T/P or Barrovian’ (Barton Block) and ‘colder than normal’ (or eclogite–high-pressure granulite, Nundroo Block) subdivisions of P–T space. This is suggestive of extension in the Barton Block and later convergence in the Nundroo Block. Kimban-aged tectonism in other parts of the Gawler Craton records thermal gradients ranging between ~150–133 °C/kbar. These differences in thermal gradients are appreciable, and in some cases different from previous studies on the Fowler Domain. The Curnamona Province (north-north eastern South Australian Craton) possesses sedimentation and thermal gradients consistent with divergence within this time period. This has prompted many scientific debates surrounding tectonic regime of the Proterozoic time line, which are yet to include any metamorphic quantitative pressure-temperature considerations. Apparent thermal gradients presented in this study are consistent with both divergence within the Kimban Orogenesis time line 1730–1690 Ma, and convergence within Kararn-/Hiltiba time line 1600–1550Ma. These processes are interpreted to record Tasmanide type tectonic regimes.
Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Sciences, 2015

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Bhowany, K. "Eclogite; fluid assisted metamorphism; P–T pseudosections; Caledonian Orogeny; Bergen Arcs; P–T path." Thesis, 2015. http://hdl.handle.net/2440/117958.

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Exhumed deep crust is rare and exposures that preserve both protoliths and altered domains are limited around the world. Mesoproterozoic anorthositic granulites exposed on the island of Holsnøy, western Norway, preserve different stages of progressive deformation together with the corresponding metamorphism that record the conversion to Siluro-Ordovician eclogites during fluid infiltration. Five different stages of deformation can be identified: 1) brittle deformation resulting in the formation of fractures and generation of pseudotachylites in the granulite; 2) development of mesoscale shear zones associated with increased fluid–rock interaction; 3) large-scale replacement of granulite by hydrous eclogite with blocks of granulite sitting in an eclogitic ‘matrix’; 4) complete conversion of granulite to eclogite within large-scale shear zones; and 5) break up of completely eclogitised granulite by continued fluid influx, resulting in the formation of potassium-rich mineral assemblages. P–T constraints derived from phase equilibria forward modelling document a burial and partial exhumation path with peak conditions around 21–22 kbar and 640–660 °C. Fluid infiltration began on the prograde path and continued throughout the recorded P–T evolution. However, in places limited fluid availability on the prograde path resulted in an excellent preservation of prograde mineral assemblage, allowing the burial path to be well constrained.
Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Sciences, 2015

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Raubenheimer, Denni. "P-T estimates of peak Bushveld metamorphism in the eastern Bushveld complex, Limpopo Province, South Africa : constraints from P-T pseudosections." Diss., 2012. http://hdl.handle.net/2263/29602.

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The Bushveld Igneous Complex (BIC) is the largest layered mafic intrusion in the world and contains the largest known deposits of vanadium, chromium and Platinum group elements on the planet, as well as large deposits of iron, nickel, copper, tin and fluorite. To aid and improve our understanding of the tectonics that prevailed during the emplacement of the Bushveld Complex relevant data can still be extracted from the metamorphic aureole of the Complex, not the least among which are accurate determinations of pressure conditions during peak metamorphism. A relatively large number of geothermobarometric investigations have been performed on the Bushveld Complex aureole. The summation of all the thermobarometric studies on the Bushveld Complex aureole produces a dataset with largely divergent pressure-estimates, ranging from 1.5 kbar to 5.5 kbar. This study’s main aim was to produce new thermobarometric data for the Eastern Bushveld Complex aureole. To this ends metapelites from the aureole were sampled between Lydenburg and somewhat northwest of Penge. Polished thin-sections were produced for a number of samples and studied under microscope. After XRF analyses were performed on a refined number of samples, pseudosections for these samples were produced using Perplex. Electron microprobe analyses were used to analyze mineral chemistries of five samples and the resultant data used to construct isopleths for these samples in Perplex. The isopleth data was then used to scrutinize and, where possible, refine PT-estimates. The principal results obtained from mineral equilibrium modeling were the pseudosections and isopleths of samples DY09-54 and DY09-56. These samples’ cumulate results suggest that the metapelites of their sampling locality, which lies roughly ~36 km northwest of Penge, reached 530-565 ºC and 2230-2960 bar during peak metamorphism. Modelled isopleths of MnO/(MnO+CaO+FeO+MgO) suggest that these estimates be refined to 550 ± 5 ºC and 2650 ± 20 bar. These pressure estimates agree well with the majority of barometric studies in the literature that post-date the nineteen-eighties. The pressure estimates of 2230-2960 bar suggest that DY09-54 and DY09-56 were at a crustal depth of 7.9-10.4 km during peak metamorphism, assuming that a roughly 1.5 km thick load of rock, mainly of the Rooiberg Group and/or the Lebowa Granite Suite, were situated above the Rustenburg Layered Suite and at the top of the pile that overlay the samples. In such a case the Rustenburg Layered Suite’s contribution to the load would have represented a 4.2-6.7 km thick pile of these mafic rocks and, assuming that the load of Pretoria Group strata in the floor to the Complex had a thickness of 2350 m, the base of the Rustenburg Layered Suite would have been at a crustal depth of 5.6-8.0 km during peak metamorphism and directly above samples DY09-54 and DY09-56. Modelled palaeogeotherms together with the peak-metamorphic crustal depths estimated for samples DY09-54 and DY09-56 suggest that at peak metamorphism the samples’ temperatures had been elevated by no less than 320-355 °C, assuming that no thermal metamorphic effect was active on the samples just prior to the intrusion of the Bushveld Complex. Copyright
Dissertation (MSc)--University of Pretoria, 2012.
Geology
unrestricted

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Частини книг з теми "P–T pseudosection"

Leinonen, Seppo. "P-T-XCO2 Pseudosection Modelling of Talc-Magnesite Soapstone." In Engineering Geology for Society and Territory - Volume 5, 247–52. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-09048-1_48.

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Fedkin, Valentin V., Theodore D. Burlick, Mary L. Leech, Andrey A. Shchipansky, Peter M. Valizer, and W. G. Ernst. "Petrotectonic origin of mafic eclogites from the Maksyutov subduction complex, south Ural Mountains, Russia." In Plate Tectonics, Ophiolites, and Societal Significance of Geology: A Celebration of the Career of Eldridge Moores. Geological Society of America, 2021. http://dx.doi.org/10.1130/2021.2552(09).

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ABSTRACT The Maksyutov complex is a mid- to late-Paleozoic high- to ultrahigh-pressure (HP-UHP) eclogite-bearing subduction zone terrane in the south Ural Mountains. Previous reports of radial fractures emanating from quartz inclusions in garnet, omphacite, and glaucophane, cuboid graphite pseudomorphs after matrix diamond, and microdiamond aggregates preserved in garnet identified by Raman spectroscopy indicate that parts of the complex were subjected to physical conditions of ∼600 °C and >2.8 GPa for coesite-bearing rocks, and >3.2 GPa for diamond-bearing rocks. Peak UHP eclogite-facies metamorphism took place at ca. 385 Ma, and rocks were exhumed through retrograde blueschist-facies conditions by ca. 360 Ma. Bulk analyses of 18 rocks reflect the presence of mid-oceanic-ridge basalt (MORB), oceanic-island basalt (OIB), and island-arc tholeiite (IAT) basaltic and andesitic series plus their metasomatized equivalents. To more fully constrain the petrotectonic evolution of the complex, we computed isochemical phase equilibria models for representative metabasites in the system Na2O-CaO-K2O-FeO-MgO-Al2O3-SiO2-H2O-TiO2 based on our new bulk-rock X-ray fluorescence (XRF) data. Both conventional Fe-Mg exchange thermometry and phase equilibrium modeling result in higher peak equilibrium temperatures than were previously reported for the complex. Pseudosection analysis provides minimum P-T conditions of 650–675 °C and 2.4–2.6 GPa for peak assemblages of the least retrogressed Maksyutov eclogites, whereas Fe-Mg exchange thermometry yields temperatures of 750 ± 25 °C for a pressure of 2.5 GPa. We interpret our new P-T data to reflect a thermal maximum reached by the eclogites on their initial decompression-exhumation stage, that defines a metamorphic field gradient; the relict coesite and microdiamond aggregates previously reported testify to pressure maxima that define an earlier prograde subduction zone gradient. The eclogitic Maksyutov complex marks underflow of the paleo-Asian oceanic plate and does not represent subduction of the Siberian cratonal margin.

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Тези доповідей конференцій з теми "P–T pseudosection"

Tjapkes, Daniel J., and Virginia L. Peterson. "PRESERVED LARGE GARNET ZONING, PSEUDOSECTION THERMOBAROMETRY, AND LOCALIZED DEFORMATION CONSTRAIN P-T PATH AND EXTEND GRANULITE FACIES REGION IN THE SOUTHERN APPALACHIAN CENTRAL BLUE RIDGE, NORTH CAROLINA." In GSA Annual Meeting in Seattle, Washington, USA - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017am-300671.

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