Relevant bibliographies by topics / P–T pseudosections

Academic literature on the topic 'P–T pseudosections'

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Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "P–T pseudosections"

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Zhang, Lifei, Qianjie Wang, and Shuguang Song. "Lawsonite blueschist in Northern Qilian, NW China: P–T pseudosections and petrologic implications." Journal of Asian Earth Sciences 35, no. 3-4 (July 2009): 354–66. http://dx.doi.org/10.1016/j.jseaes.2008.11.007.

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Du, Jin-Xue, Li-Fei Zhang, Xiao-Jie Shen, and Thomas Bader. "A new P-T-t path of eclogites from Chinese southwestern Tianshan: constraints from P-T pseudosections and Sm-Nd isochron dating." Lithos 200-201 (July 2014): 258–72. http://dx.doi.org/10.1016/j.lithos.2014.04.009.

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Hoschek, Gert. "Comparison of calculated P-T pseudosections for a kyanite eclogite from the Tauern Window, Eastern Alps, Austria." European Journal of Mineralogy 16, no. 1 (February 23, 2004): 59–72. http://dx.doi.org/10.1127/0935-1221/2004/0016-0059.

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Mposkos, E., and I. Baziotis. "STUDY OF THE METAMORPHIC EVOLUTION OF A CARBONATE-BEARING METAPERIDOTITE FROM THE SIDIRONERO COMPLEX (CENTRAL RHODOPE, GREECE) USING P-T AND P(T)-XCO2 PSEUDOSECTIONS." Bulletin of the Geological Society of Greece 43, no. 5 (July 31, 2017): 2667. http://dx.doi.org/10.12681/bgsg.11674.

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The carbonate-bearing metaperidotite from Sidironero Complex, north of the Xanthi town is composed primarily of olivine and orthopyroxene megacrysts and of Ti-clinohumite, tremolite, chlorite, dolomite, magnesite, talc, antigorite and spinel group minerals. The metaperidotite underwent a prograde HP metamorphism probably isofacial with the neighboring amphibolitized eclogites. Calculated P-T and P(T)-XCO2 phase diagram sections (pseudosections) for the bulk rock composition showed that XCO2 in the fluid phase was extremely low (≤0.008) at the first stages of the metamorphism and increased up to 0.022 at the peak P-T conditions ~1.5 GPa and 690 0C. The prograde metamorphism probably started from a hydrated and carbonated assemblage including talc+chlorite+magnesite+dolomite and proceeded with tremolite and antigorite formation before olivine growth, and orthopyroxene formation after olivine growth (Ol-1). Matrix dolomite, breakdown of chlorite (Chl-1) to Cr spinel+olivine and of Ti-clinohumite to olivine+Mg-ilmenite occurred during decompression. The P-T path is constrained by the absence of clinopyroxene in the metaperidotite.
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Braga, R., H. J. Massonne, and L. Morten. "An early metamorphic stage for the Variscan Ulten Zone gneiss (NE Italy): evidence from mineral inclusions in kyanite." Mineralogical Magazine 71, no. 06 (December 2007): 691–702. http://dx.doi.org/10.1180/minmag.2007.071.6.691.

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Abstract The early P-T evolution of a garnet-kyanite gneiss from the Variscan Ulten Zone has been defined by detailed petrographic observations leading to the detection of chlorite-epidote- and staurolite-bearing assemblages enclosed in kyanite porphyroblasts. Calculations of P-T pseudosections in the system NaCaKFeMgAlSiHO allowed us to constrain the evolution of these relics to the earliest metamorphic stages. The overall path shows a P-T increase to a peak of 11–12 kbar and 600–650°C followed by decompressional heating to 720°C and 9–10 kbar and final cooling at 7 kbar, 550–600°C. This clockwise P-T path reflects crustal thickening and subsequent thermal decay related to the continental collision of the Variscan orogeny 330–340 Ma ago. Our study demonstrates that large kyanite porphyroblasts may preserve assemblages related to prograde metamorphic stages. As a result, the detection of mineral inclusions in kyanite can complement many similar studies on mineral suites hosted in garnet and zircon.
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Zeh, A. "Inference of a detailed P -T path from P -T pseudosections using metapelitic rocks of variable composition from a single outcrop, Shackleton Range, Antarctica." Journal of Metamorphic Geology 19, no. 4 (July 2001): 329–50. http://dx.doi.org/10.1046/j.0263-4929.2000.00314.x.

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Vance, Derek, and Emma Mahar. "Pressure-temperature paths from P - T pseudosections and zoned garnets: potential, limitations and examples from the Zanskar Himalaya, NW India." Contributions to Mineralogy and Petrology 132, no. 3 (August 28, 1998): 225–45. http://dx.doi.org/10.1007/s004100050419.

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Ramacciotti, Carlos Dino, César Casquet, Edgardo Gaspar Baldo, Sebastián Osvaldo Verdecchia, Matías Martín Morales, and Priscila Soledad Zandomeni. "Metamorfismo de alto gradiente P/T en la Sierra de Pie de Palo (Sierras Pampeanas, Argentina): modelado de equilibrio de fases minerales e implicancias geodinámicas en el antearco famatiniano." Andean Geology 46, no. 3 (September 30, 2019): 526. http://dx.doi.org/10.5027/andgeov46n3-3198.

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The Sierra de Pie de Palo (SPP, Western Sierras Pampeanas) shows evidence of two regional metamorphisms: one Mesoproterozoic attributed to the Grenvillian orogeny and other of Ordovician age related to the Famatinian orogeny. The Neoproterozoic-to-Cambrian sedimentary successions that cover the Grenvillian basement only record the Ordovician event. One staurolite-schist from the Ediacaran Difunta Correa Metasedimentary Sequence collected in the southeastern side of the SPP allows to constrain, by means of pseudosections, a prograde evolution from ca. 3 kbar and 515 ºC up to ca. 9 kbar and 640 ºC corresponding to a high P/T gradient. The SPP and the immediately east Loma de Las Chacras outcrop were part of the famatinian forearc which shows a progressive decrease of P (from ca. 13 kbar to 6 kbar), T (from ca. 900 ºC to 450 ºC), and P/T gradient (from ca. 85 ºC/kbar to 35 ºC/kbar) towards the active continental margin on the west. The Caucete Group, in the western side of the SPP, represents the westernmost part of the forearc, near to the active continental margin. Metamorphism was apparently coeval with the Famatinian magmatism and with ductile underthrusting at ca. 470-465 Ma, which led to burial of the forearc beneath the magmatic arc.
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Cirrincione, Rosolino, Gaetano Ortolano, Antonino Pezzino, and Rosalda Punturo. "Poly-orogenic multi-stage metamorphic evolution inferred via P–T pseudosections: An example from Aspromonte Massif basement rocks (Southern Calabria, Italy)." Lithos 103, no. 3-4 (July 2008): 466–502. http://dx.doi.org/10.1016/j.lithos.2007.11.001.

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Liu, Fenglin, Lifei Zhang, Xiaoli Li, Alexander I. Slabunov, Chunjing Wei, and Thomas Bader. "The metamorphic evolution of Paleoproterozoic eclogites in Kuru-Vaara, northern Belomorian Province, Russia: Constraints from P-T pseudosections and zircon dating." Precambrian Research 289 (February 2017): 31–47. http://dx.doi.org/10.1016/j.precamres.2016.11.011.

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Dissertations / Theses on the topic "P–T pseudosections"

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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
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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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Book chapters on the topic "P–T pseudosections"

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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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Conference papers on the topic "P–T pseudosections"

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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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