Relevant bibliographies by topics / HP metamorphism

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'HP metamorphism'

Author: Grafiati
Published: 4 June 2021
Last updated: 2 February 2022

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Journal articles on the topic "HP metamorphism"

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Gilotti, Jane A., and Synnøve Elvevold. "Extensional exhumation of a high-pressure granulite terrane in Payer Land, Greenland Caledonides: structural, petrologic, and geochronologic evidence from metapelites." Canadian Journal of Earth Sciences 39, no. 8 (August 1, 2002): 1169–87. http://dx.doi.org/10.1139/e02-019.

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The Payer Land gneiss complex is unique among the mostly amphibolite-facies, mid-crustal gneiss complexes in the East Greenland Caledonides due to its well-preserved, regional high-pressure (HP) granulite-facies metamorphism. High-pressure – high-temperature (HP–HT) assemblages are recognized in mafic, ultramafic, granitic, and metasedimentary lithologies. Anatectic metapelites contain the assemblage garnet + kyanite + K-feldspar + antiperthite (exsolved ternary feldspar) + quartz ± biotite ± rutile and record approximately the same peak metamorphic conditions (pressure (P) = 1.4–1.5 GPa, temperature (T) = 800–850°C) as those of the neighboring mafic HP granulites. The HP granulite-facies metamorphism is Caledonian based on in situ U–Th–Pb electron microprobe dating of monazite from two samples of the aluminous paragneiss. The monazites are found along garnet–kyanite phase boundaries, as inclusions in garnet and kyanite, and within small leucocratic melt pods (K-feldspar + plagioclase + kyanite ± garnet) within the HP–HT paragneisses. Mylonitic equivalents of the metapelites contain a detrital monazite age signature that suggests the Payer Land paragneisses correlate with other Mesoproterozoic metasedimentary sequences in the area. The gneisses form a metamorphic core complex that is separated from the overlying low-grade sedimentary rocks of the Neoproterozoic Eleonore Bay Supergroup by an extensional detachment. This newly recognized Payer Land detachment is part of a system of prominent extensional faults located in the southern half of the Greenland Caledonides (i.e., south of 76°N). The HP granulites preserve the deepest level of crust exposed in this southern segment of the orogen and attest to significant crustal thickening.
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REBAY, GISELLA, DAVIDE ZANONI, ANTONIO LANGONE, PIETRO LUONI, MASSIMO TIEPOLO, and MARIA IOLE SPALLA. "Dating of ultramafic rocks from the Western Alps ophiolites discloses Late Cretaceous subduction ages in the Zermatt-Saas Zone." Geological Magazine 155, no. 2 (May 3, 2017): 298–315. http://dx.doi.org/10.1017/s0016756817000334.

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AbstractThe Zermatt-Saas Zone was part of the Middle to Late Jurassic Tethyan lithosphere that underwent oceanic metamorphism during Mesozoic time and subduction during Eocene time (HP to UHP metamorphism). In upper Valtournanche, serpentinite, metarodingite and eclogite record a dominant S2 foliation that developed under 2.5±0.3 GPa and 600±20°C during Alpine subduction. Serpentinites contain clinopyroxene and rare zircon porphyroclasts. Clinopyroxene porphyroclasts show fringes within S2 with similar compositions to that of grains defining S2. Zircon cores show zoning typical of magmatic growth and thin fringes parallel to the S2 foliation. These features indicate crystallization of clinopyroxene and zircon fringes during HP syn-D2 metamorphism, related to the Alpine subduction. The U–Pb zircon dates for cores and fringes reveal crystallization at 165±3.2 Ma and 65.5±5.6 Ma, respectively. The Middle Jurassic dates are in agreement with the known ages for the oceanic accretion of the Tethyan lithosphere. The Late Cretaceaous - Paleocene dates suggest that the Zermatt-Saas Zone experienced high-pressure to ultra-high-pressure (HP–UHP) metamorphism at c. 16 Ma earlier than previously reported. This result is in agreement with the evidence that in the Western Alps the continental Sesia-Lanzo Zone reached the subduction climax at least from 70 Ma and was exhumed during ongoing oceanic subduction. Our results are further evidence that the Zermatt-Saas ophiolites diachronically recorded heterogeneous HP–UHP metamorphism.
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Li, Yunshuai, Jianxin Zhang, Shengyao Yu, Yanguang Li, Hu Guo, Jian Zhang, Changlei Fu, Hui Cao, Mengqi Jin, and Zhihui Cai. "Petrological, geochronological, and geochemical potential accounting for continental subduction and exhumation: A case study of felsic granulites from South Altyn Tagh, northwestern China." GSA Bulletin 132, no. 11-12 (April 22, 2020): 2611–30. http://dx.doi.org/10.1130/b35459.1.

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Abstract Deciphering the formation and geodynamic evolution of high-pressure (HP) granulites in a collisional orogeny can provide crucial constraints on the geodynamic evolution of subduction-exhumation. To fully exploit the geodynamic potential of metamorphic rocks, it is necessary to constrain the metamorphic ages, although it is difficult to link zircon and monazite ages to metamorphic evolution. A good case study for understanding these geodynamic processes is felsic granulites in the Bashiwake area, South Altyn Tagh. Petrographic observations suggest that the studied felsic granulites have suffered multi-stage metamorphism, and the distinct metamorphic events were documented by compositional zoning and high Y + heavy rare earth element (HREE) concentrations in the large garnet porphyroblast. Zircon U-Pb dating yielded two major age clusters: one age cluster at ca. 900 Ma represents the age of the protolith for the felsic granulite, and another age cluster at ca. 500 Ma represents the post-UHT (ultrahigh temperature) stage based on the rare earth element distribution coefficients between zircon and garnet. Meanwhile, in situ monazites U-Pb dating yielded a weighted mean 206Pb/238U age of 482 ± 3.5 Ma, and the monazite U-Pb age was interpreted to be in agreement with the metamorphic zircon rims data, which together with zircon recorded the cooling time after the UHT stage. Whole-rock major and trace elements as well as Sr-Nd isotopes suggest that the protolith of the felsic granulite derived from partial melting of ancient crustal materials with the addition of mantle materials. Integrating these results along with previous studies, we propose that the felsic granulites metamorphosed from the Neoproterozoic granitic rocks, and the granitic rocks with associated mafic-ultramafic rocks suffered a common high-pressure–ultrahigh temperature (HP-UHT) metamorphism and subsequent granulite-facies metamorphism. A tentative model of subduction-relamination was proposed for the geodynamic evolution of the Bashiwake unit, South Altyn Tagh.
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KROHE, A., and E. MPOSKOS. "Structural evolution and exhumation history of the Rhodope UHP-HP metamorphic province (Northern Greece)." Bulletin of the Geological Society of Greece 34, no. 1 (January 1, 2001): 75. http://dx.doi.org/10.12681/bgsg.16945.

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Middle/Early Alpine UHP-HP domain of the Rhodope (N'Greece) show pressures >3.6 Gpa. UHP-HP rocks have been emplaced in three major tectonic pulses: (i) At about 65->48 Ma the UHP Kimi Complex was exhumed at the surface representing the structurally uppermost UHP unit, (ii) Between > 42-30 Ma, the Sidironero, Kardamos and Kechros Complexes were exhumed underlying the Kimi Complex in the central and eastern Rhodope, respectively. They are characterized by HP-metamorphism (some parts by UHP-metamorphism), isothermal decompression and probably rapid exhumation. Exhumation tectonics involves deep level thrusting, synchronous high level extension, and successive post-thrusting extension. The post-thrusting Xanthi low angle normal detachment system extending over a distance of 100 km, from central Rhodope to eastern Rhodope, is interpreted to be responsible for a decrease in recent crustal thickness of about 20 km from central to eastern Rhodope. Lutetian (c. 48-43Ma) to Oligocene marine basins transgressed atop the Kimi Complex representing the upper plate of all detachment generations, (iii) The third exhumation pulse between 26 to 8 Ma, exhumed the Thasos/Pangeon metamorphic core complexes representing the structurally lowermost tectonic units of the Rhodope domain. Their exhumation occurred by displacements on the Miocene Strymon and Thasos detachment systems.
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Javkhlan, Terbishiinkhen O., Akira Takasu, Md Fazle Kabir, and Dash Batulzii. "Multiple Metamorphic Events Recorded within Eclogites of the Chandman District, SW Mongolia." Minerals 9, no. 8 (August 18, 2019): 495. http://dx.doi.org/10.3390/min9080495.

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The eclogite-bearing Alag Khadny metamorphic complex in the Lake Zone, SW Mongolia occupies the central region of the Central Asian Orogenic Belt, the largest Phanerozoic orogenic belt in the world. The complex consists mainly of orthogneisses intercalated with eclogites and micaschists in a mélange zone. Most of eclogites are strongly amphibolitized. In this study, we examined petrography and mineral chemistry of eclogites and amphibolitized eclogites, respectively. The result of our research shows that Chandman eclogites experienced multiple events of metamorphism in throughout their subduction and subsequent collision history. We revealed that eclogites were subjected to blueschist facies metamorphism before the peak eclogite facies stage. In addition, we have studied amphibolitized eclogite, and revealed that another distinct progressive medium pressure (MP) epidote-amphibolite facies metamorphic event took place in the eclogite, consistent with collision process. The multiple events of metamorphism in eclogites have been revealed by zonation textures of HP amphiboles zoned with glaucophane→barroisite→Mg-hornblende and MP amphiboles zoned with actinolite/winchite→barroisite→Mg-hornblende/tschermakite/Fe-pargasite. These amphiboles with different zonation textures reflect their metamorphic history of subduction to collision events.
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Liou, J. G., W. G. Ernst, S. G. Song, and B. M. Jahn. "Tectonics and HP–UHP metamorphism of northern Tibet – Preface." Journal of Asian Earth Sciences 35, no. 3-4 (July 2009): 191–98. http://dx.doi.org/10.1016/j.jseaes.2009.03.001.

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Xu, W., X. Liu, Q. Wang, J. Lin, and D. Wang. "Garnet exsolution in garnet clinopyroxenite and clinopyroxenite xenoliths in early Cretaceous intrusions from the Xuzhou region, eastern China." Mineralogical Magazine 68, no. 3 (June 2004): 443–53. http://dx.doi.org/10.1180/0026461046830198.

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AbstractExsolved garnet, sometimes associated with exsolved amphibole and zoisite, is abundant in aluminous clinopyroxene of garnet clinopyroxenite and clinopyroxenite xenoliths in the early Cretaceous dioriticmonzodioritic intrusions from the Xuzhou region, ∼100 km west of the Sulu ultrahigh-pressure (UHP) metamorphic terrane in eastern China. In addition to the mineral exsolutions, intergranular fine-grained garnet, zoisite, titanite, and sometimes amphibole are also present around the primary clinopyroxene grains. Clinopyroxene shows compositional gradients, with decreasing Al and increasing Si and Mg, adjacent to the garnet lamellae and intergranular garnet. In contrast, the exsolved and intergranular garnet is homogeneous in composition and typically more grossular-rich and pyrope- and almandinepoor than the coarse-grained primary garnet. The estimates of P and T for the precursor assemblage and garnet exsolution suggests a decrease of temperature from ∼950—1100ºC down to 620—780°C, and a nearly constant pressure from ∼15—20 kbar to 18 kbar, which are comparable with the metamorphic conditions of the associated eclogites. Therefore, garnet exsolution in garnet clinopyroxenite and clinopyroxenite xenoliths could be caused by high-pressure (HP) metamorphism. SHRIMP zircon U-Pb dating for the associated eclogite and gneiss xenoliths and Sm-Nd whole rock-garnet dating for the same eclogite demonstrate that parts of lower crust on the southeastern margin of the North China craton might be involved in the Triassic HP metamorphism due to the deep subduction of the Yangtze craton.
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Do Campo, M., and F. Nieto. "Transmission electron microscopy study of very low-grade metamorphic evolution in Neoproterozoic pelites of the Puncoviscana formation (Cordillera Oriental, NW Argentina)." Clay Minerals 38, no. 4 (December 2003): 459–81. http://dx.doi.org/10.1180/0009855033840109.

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AbstractThe Puncoviscana Formation, largely cropping out in NW Argentina, is mainly composed of a pelite-greywacke turbidite sequence affected by incipient regional metamorphism and polyphase deformation. Metapelites, composed mainly of quartz, albite, dioctahedral mica and chlorite, were sampled in the Lules-Puncoviscana and Choromoro belts. Lattice-fringe images, selected area electron diffraction and analytical electron microscopy analyses, coupled with previous data from white mica crystallinity index, indicate a state of reaction progress for Puncoviscana slates consistent with medium anchizone- to epizone-grade metamorphism. The 2Mpolytype prevails in dioctahedral micas, coexisting in a few cases with the 1Mdpolytype as a consequence of lack of equilibrium. The 2Mpolytype coexists with 3Tin two slates and long-range four-layer and ten-layer stacking sequences were identified in another sample. Samples with 3Tand long-range stacking sequences presentbvalues characteristic of intermediate–high pressure metamorphism and ordered chlorites (1L, 2L, 3Land 7L) prevail.Based on the Si contents of dioctahedral micas and considering peak temperatures of ∼350 –400ºC, pressures from 5 kbar and 5 –7 kbar were derived for metapelites from the Lules- Puncoviscana and Choromoro belts, respectively. These values agree with facies series derived from thebvalues. Micas with a wide range of phengitic substitution, as evidenced by Fe + Mg and Si contents, coexist. These variations could not arise from the disturbing effect of detrital white K-mica because TEM evidence indicates that they are absent or represent <10% of the mica population. Thus, compositional variations suggest that dioctahedral micas of individual slates crystallized at different pressure conditions in response to theP-Tpath of the metamorphism. Moreover, in several biotite-free slates the illite crystallinity (IC) values lead to an underestimation of the metamorphic grade attained in these rocks.The coexistence of IC corresponding to anchizone and the occurrence of biotite in some slates and felsic metavolcanic rocks intercalated in the Puncoviscana metasediments are interpreted to be the result of a metamorphic path including a relatively high-pressure/ low-temperature (HP/LT) event, followed by a lower-pressure overprint possibly at higher temperatures than the HP/LTevent. Small micas formed during the high-pressure stage would prevail in the <2 mm fraction, producing anchizone IC.
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Brueckner, H. K. "Dunk, Dunkless and Re-dunk Tectonics: A Model for Metamorphism, Lack of Metamorphism, and Repeated Metamorphism of HP/UHP Terranes." International Geology Review 48, no. 11 (November 2006): 978–95. http://dx.doi.org/10.2747/0020-6814.48.11.978.

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Zhang, Lifei, Zeming Zhang, Hans-Peter Schertl, and Chunjing Wei. "HP–UHP metamorphism and tectonic evolution of orogenic belts: introduction." Geological Society, London, Special Publications 474, no. 1 (2019): 1–4. http://dx.doi.org/10.1144/sp474.15.

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Dissertations / Theses on the topic "HP metamorphism"

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Vitale, Brovarone Alberto. "From rifting to orogen : structure of Alpine Corsica and inheritance of rifting-related architectures in HP terranes." Thesis, Montpellier 2, 2011. http://www.theses.fr/2011MON20029/document.

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La Corse Alpine offre une section complète du prisme orogénique alpin où la plupart des équivalents des unités décrites dans les Alpes Occidentales peuvent être trouvés sur une section de 40 km. Les minéraux d'haute pression sont exceptionnellement bien préservés, particulièrement la lawsonite, offrant un accès unique à la compréhension de zones de subduction. La Corse alpine est formée par une pile complexe d’unités métamorphiques d'origine continentale et océanique. Ces unités ont été interprétées soit comme des mélanges tectoniques complexes formés pendant la subduction alpine, soit comme les parties plus continues de lithosphère continentale et-ou océanique. Les rares estimations de condition PT sur des larges régions de la chaîne résultent en plusieurs incertitudes dans l'identification des limites séparant les unités qui ont subi des évolutions tectono-métamorphiques différentes et, par conséquent, dans la définition d'une architecture complète de la chaîne. Les données de terrain, structurelles et métamorphiques obtenues dans cette étude aux différentes échelles suggèrent que la chaîne de la Corse alpine est caractérisée par une forte conservation de structures pré-alpin, de la micro-échelle à l'échelle de la chaîne, malgré la déformation intense associée avec le métamorphisme, qui a localement donné les conditions du facies éclogitique et lawsonite. En détail, seulement neuf domaines tectono-métamorphiques homogènes ont été identifiés. Ces terrains peuvent être attribué aux domaines paléogéographiques différents qui ont subi des évolutions tectono-métamorphiques différentes. Malgré ça, les données géochronologiques fournies pendant cette étude indiquent que la Corse alpine résulte d'une évolution complexe, étant caractérisée par la signature claire tant de la tectonique alpine Eocène, à 35 Ma, que de la tectonique apennine, à 25 Ma. Les résultats fournis dans cette thèse contribuent non seulement à la compréhension des processus de subduction et de formation de montagnes, mais donnent aussi des contraintes importantes pour déchiffrer les systèmes Tethys-Alpes et Alpes-Apennine
Alpine Corsica offers a complete section through the Alpine orogenic wedge where most equivalent of the units described in the Western Alps may be found over a 40 km section. High-pressure mineral assemblages are exceptionally well preserved, especially lawsonite, offering a unique access to the understanding of deeply subducted terranes.Alpine Corsica consists of a complex stack of variably metamorphosed units of continental and Tethys-derived material. These units have been interpreted either as complex tectonic mixing formed during the Alpine subduction, or as more continuous portions of continental and/or oceanic lithosphere. The lack of detailed PT estimates over wide regions of the belt results in several uncertainties in identifying the boundaries separating units that experienced different tectono-metamorphic evolutions and, consequently, in the definition of an exhaustive architecture of the belt.Field, structural and metamorphic data collected in this study at different scales suggest that the Alpine Corsica belt is characterized by a high preservation of pre-Alpine sctructures, from the micro-scale up the scale of the belt, despite the intense deformation essociated with metamorphism, which locally reached lawsonite-eclogite metamorphism. In particular, only nine homogeneous tectono-metamorphic domains have been identified. These terranes can be referred to different paleogeographic domains that experienced different tectono-metamorphic evolutions.Despite that, geochronological data provided during this study indicate that Alpine Corsica results fro a complex polyphase evolution, being characterized by clear signature of both Alpine tectonics, at around 35 Ma, and Apennine tectonics, at around 25 Ma.Results provided in this paper contribute not only to the understanding of processes of subduction and mountain building, but also give important constraints for deciphering the Tethys-Alps and Alps-Apennine systems
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Krauss, Jason B. "High-pressure (HP), granulite-facies thrusting in a thick-skinned thrust system in the eastern Grenville Province, central Labrador /." Internet access available to MUN users only, 2002. http://collections.mun.ca/u?/theses,42716.

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Xiao, Yilin. "Fluid histories during HP and UHP metamorphism in Dabie Shan, China constraints from trace elements, fluid inclusions, and stable isotopes /." [S.l.] : [s.n.], 2000. http://webdoc.sub.gwdg.de/diss/2001/xiao/diss.pdf.

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Tan, Zhou. "P-T-deformation-time evolution of the Akeyasi HP/UHP complex (SW-Tianshan, China) and implications for subduction dynamics." Thesis, Sorbonne université, 2018. http://www.theses.fr/2018SORUS185/document.

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Cette étude vise à caractériser des fragments clés d’une interface de subduction fossile affleurant dans la Ceinture Métamorphique du Sud-Tianshan (Chine). Nous étudions les processus de subduction au travers de la profondeur critique de ~80 km, au-delà de laquelle la géophysique et les modèles prévoient un changement du couplage mécanique, et les roches océaniques ne sont normalement pas exhumées. Ce travail s’intéresse au Complexe Métamorphique Akeyazi (AMC), un épais empilement de roches métavolcanoclastiques enveloppant des écailles éclogitiques, exposé sur ~30 km dans la vallée de Kebuerte, et préservant de nombreuses reliques de coésites. L’étude structurale révèle que l’AMC est un dôme métamorphique consistant de plusieurs nappes cohérentes d’ampleur kilométrique avec des histoire P-T-t-d distinctes. 4 unités sur 6, i.e. UH (2.75 GPa/480-560°C), EB (2.1/505), MU (1.45/485) et GT (>0.7-1.0/470-520) ont été subduites à des profondeurs de ~85, 65, 45 et 30 km respectivement. La déformation rétrograde des unités, liée à leur exhumation, est caractérisée par des bandes de cisaillement top vers le Nord au faciès schiste bleu. Le pic d’enfouissement de ces unités a eu lieu à 320±1, 332±2, 359±2 et 280-310 Ma pour les unités UH, EB, MU et schiste vert, indiquant plusieurs courts épisodes de détachement de matériel de la plaque plongeante. L’évolution tectono-métamorphique de ~12 à 5-7°C/km au cours du temps peut refléter le refroidissement progressif de la subduction. La juxtaposition et l’exhumation à 1-3 mm/an de ces 4 unités à des profondeurs crustales a eu lieu autour de 290-300 Ma
This study attempts to characterize key fossil fragments of material equilibrated along subduction plate boundary, now exposed in Chinese SW-Tianshan Metamorphic Belt (STMB). We herein elucidate some subduction zone processes across a critical depth range of ~80km, beyond which geophysicist and modeler infer a change in mechanical coupling and oceanic rocks are usually not recovered. It focuses on an unusually thick pile of HP/UHP metavolcanoclastics, wrapping eclogite slices and preserving pervasive coesite relics, along a ~30km-long transect across the Akeyazi metamorphic complex (AMC) in the Kebuerte valley. Structural studies reveal the current geometry of the AMC is a metamorphic dome with evidence of internal nappe stacking and should be subdivided into several coherent, km-scale tectonic units with distinct P-T-time-deformation histories. At least 4 of 6 sub-units identified here, i.e., the UH (2.75 GPa/480-560°C), EB (2.1/505), MU (1.45/485) and GT units (>0.7-1.0/470-520) were subducted and buried to depths of ~85, 65, 45 and 30 km respectively. Deformation following EC/BS-EC peak burial is marked by pervasive BS facies exhumation-related shear senses with a top to North component. Radiometric constraints yield peak burial ages of 320±1, 332±2, 359±2 and 280-310 Ma, respectively, for the UH, EB, MU and GS facies units, indicating several short-lived detachment episodes of material from the downgoing plate. The tectono-metamorphic evolution from ~12 to 5-7°C/km with time may reflect progressive cooling of the subduction system. Juxtaposition & exhumation of those 4 units to mid-crustal depth, at rates on the order of 1-3 mm/yr, was accomplished around 290-300Ma
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Bessière, Eloïse. "Évolution géodynamique des zones internes des cordillères bétiques (Andalousie, Espagne) : Apports d'une étude pluridisciplinaire du complexe Alpujárride." Thesis, Orléans, 2019. http://www.theses.fr/2019ORLE3095.

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Les cordillères Bético-Rifaines sont situées en Méditerranée occidentale, où elles forment un arc étroit. Comparée à d’autres segments orogéniques, leur évolution géodynamique reste extrêmement discutée en raison d’une histoire tectono-métamorphique polyphasée depuis le rifting Mésozoïque, jusqu’à l’histoire alpine incluant subduction,collision et effondrement tardi-orogénique. Cette thèse s’est focalisée sur deux problématiques restant activement débattues et qui concernent le complexe Alpujárride, appartenant aux Zones Internes (ZI) des Cordillères Bétiques.Deux zones d’étude ont été ciblées, avec (i) les massifs péridotitiques affleurant à l’ouest et dont les modalités de mise en place restent énigmatiques et (ii) les unités tectoniques affleurant à l’est et dans lesquelles les paragenèses de haute pression-basse température (HP/BT) en lien avec l’épisode de subduction alpine, sont les mieux préservées mais dont les contraintes temporelles sont largement incertaines.Ce travail de recherche s’est attaché à utiliser une approche multi-échelles, depuis celle de l’affleurement jusqu’à celle de la région, et pluridisciplinaire, avec un travail de cartographie détaillée, des observations structurales et pétrographiques, de la thermométrie Raman et des datations 40Ar/39Ar. Nos résultats mettent en évidence(i) l’exhumation du massif péridotitique de Ronda dans un contexte d’hyper-amincissement de la croûte continentale résultant d’un épisode de rifting et (ii) la fin de l’épisode métamorphique de HP/BT vers 38 Ma avec l’initiation du retrait du panneau plongeant et l’ouverture d’un bassin d’arrière-arc, associée à un métamorphisme de haute température-basse pression (HT/BP). C’est dans ce contexte extensif que le complexe Alpujárride s’exhume après une phase majeure d’amincissement crustal. Cet épisode de métamorphisme de HT/BP prend fin avec la mise en place des ZI des Cordillères Bético-Rifaines sur les marges Ibérie et Afrique, vers 20 Ma
The Betic-Rif Cordillera, located in the western Mediterranean region, forms a narrow, arcuate orogenic belt. By comparison with other orogenic belts in the Mediterranean realm, its geodynamic evolution is higly controversial because of a long and complex tectono-metamorphic history, including the Mesozoic rifting and the Alpineorogenesis where subduction, collisional and post-orogenic extensional events are successively recorded. This Ph.D.thesis aims to address two major issues about the geodynamic evolution of the Alpujárride Complex, a group of metamorphic units that belong to the Internal Zones of the Betic Cordillera. Two study areas have been investigated with (i) the peridotitic massifs located in the western part of this complex whose mechanisms and timing of exhumation remain unclear and (ii) the tectonic units located further east that display well-preserved high pressure low temperature (HP/LT) mineral parageneses related to the Alpine subduction episode but with high uncertainties regarding the age of this metamorphic event.This work has been carried out by following a multi-scale and multi-disciplinary approach, from the outcrop- to the regional-scale, including detailed field mapping, structural measurements, petrographic observations, Ramanthermometry and 40Ar/39Ar dating. Our results evidence (i) the exhumation of the Ronda peridotite controlled by anhyper-extension event associated with a rifting stage and (ii) the end of the HP/LT peak conditions around 38 Ma,juste before the inception of the slab roll-back and back-arc opening associated with a high temperature-lowpressure (HT-LP) metamorphic overprint. The Alpujárride Complex is exhumed during this stage, while the crust ishigly stretched. This HT-LP metamorphic event ended with the thrusting of the Internal Zones of the Betic-RifCordillera onto the Iberian and African margins, around 20 Ma ago
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TEDESCHI, Mahyra. "Geodynamic evolution of the Southern Brasilia orogen, SE Brazil: new petrochronological insights from UHT and HP metamorphic rocks." reponame:Repositório Institucional da CPRM, 2018. http://rigeo.cprm.gov.br/jspui/handle/doc/19382.

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Albrecht, Nina [Verfasser], Gerhard [Akademischer Betreuer] [Gutachter] Wörner, and Andreas [Gutachter] Pack. "Metamorphic fluids at extreme pressure conditions and their significance for element transfer in subduction zones : A multidisciplinary study on metamorphic veins in UHP/HP eclogites from Dabieshan, China / Nina Albrecht ; Gutachter: Gerhard Wörner, Andreas Pack ; Betreuer: Gerhard Wörner." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2017. http://d-nb.info/1132717515/34.

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Schlöglová, Kateřina. "Zachování HP minerálů a textur ve světlých a mafických granulitech Rychlebských hor." Master's thesis, 2011. http://www.nusl.cz/ntk/nusl-312501.

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Diploma thesis - Kateřina Schlöglová - 2011 1/2 English abstract Granulites of the Rychleby Mts. represent relics of high-pressure eclogite-facies metamorphic rocks that are scattered in various crustal and mantle segments of the Variscan orogen in central Europe. These rocks may provide important insights into early stages of Variscan plate convergence and burial as well as exhumation mechanisms. We use mineral assemblages and chemistry to reconstruct the pressure-temperature paths, mechanisms of melting, and conditions of mineral preservation of high-pressure granulites, as well as whole- rock geochemistry to aid in interpretation of granulite precursors and their geodynamic setting. The mafic granulites consist of garnet, omphacite, two feldspars, and quartz with accessory rutile and zircon. The peak assemblage was partly replaced by pargasitic amphibole and biotite. Garnet grains are zoned from Grs36Py10Alm54 (core) to Grs20Py38Alm42 (rim), and host inclusions of phengite, omphacite, unmixed feldspars, kyanite, and rutile. Omphacite composition varies from Di44Hd14Jd42 (inclusions in garnet) through Di63Hd20Jd17 (porphyroblasts) and Di63Hd24Jd13 (symplectitic intergrowths with plagioclase). Reintegrated composition of the feldspar porphyroblasts is Or43Ab53An04. The felsic granulite variety is composed...
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Xiao, Yilin. "Fluid Histories During HP and UHP Metamorphism in Dabie Shan, China: Constraints from Trace Elements, Fluid Inclusions, and Stable Isotopes." Doctoral thesis, 2001. http://hdl.handle.net/11858/00-1735-0000-0006-B257-5.

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Xiao, Yilin [Verfasser]. "Fluid histories during HP and UHP metamorphism in Dabie Shan, China : constraints from trace elements, fluid inclusions, and stable isotopes / vorgelegt von Yilin Xiao." 2000. http://d-nb.info/961823224/34.

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Book chapters on the topic "HP metamorphism"

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Wiederkehr, Michael, Romain Bousquet, Stefan M. Schmid, and Alfons Berger. "From subduction to collision: thermal overprint of HP/LT meta-sediments in the north-eastern Lepontine Dome (Swiss Alps) and consequences regarding the tectono-metamorphic evolution of the Alpine orogenic wedge." In Orogenic Processes in the Alpine Collision Zone, S127—S155. Basel: Birkhäuser Basel, 2008. http://dx.doi.org/10.1007/978-3-7643-9950-4_8.

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Krogh, E. J., and D. A. Carswell. "HP and UHP eclogites and garnet peridotites in the Scandinavian Caledonides." In Ultrahigh Pressure Metamorphism, 244–98. Cambridge University Press, 1995. http://dx.doi.org/10.1017/cbo9780511573088.009.

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Yang, Jingsui, Zhiqin Xu, Paul T. Robinson, Jianxin Zhang, Zeming Zhang, Fulai Liu, and Cailai Wu. "HP–UHP Metamorphic Belts in the Eastern Tethyan Orogenic System in China." In Ultrahigh-Pressure Metamorphism, 459–99. Elsevier, 2011. http://dx.doi.org/10.1016/b978-0-12-385144-4.00014-x.

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Eide, E. A. "A model for the tectonic history of HP and UHPM regions in east central China." In Ultrahigh Pressure Metamorphism, 391–426. Cambridge University Press, 1995. http://dx.doi.org/10.1017/cbo9780511573088.012.

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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 &gt;2.8 GPa for coesite-bearing rocks, and &gt;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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Boniface, Nelson, and Tatsuki Tsujimori. "New tectonic model and division of the Ubendian-Usagaran Belt, Tanzania: A review and in-situ dating of eclogites." 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(08).

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ABSTRACT Records of high-pressure/low-temperature (HP-LT) metamorphic interfaces are not common in Precambrian orogens. It should be noted that the association of HP-LT metamorphic interfaces and strongly deformed ocean plate stratigraphy that form accretionary prisms between trenches and magmatic arcs are recognized as hallmark signatures of modern plate tectonics. In East Africa (Tanzania), the Paleoproterozoic Ubendian-Usagaran Belt records a HP-LT metamorphic interface that we consider as a centerpiece in reviewing the description of tectonic units of the Ubendian-Usagaran Belt and defining a new tectonic model. Our new U-Pb zircon age and the interpretations from existing data reveal an age between 1920 and 1890 Ma from the kyanite bearing eclogites. This establishment adds to the information of already known HP-LT metamorphic events at 2000 Ma, 1890–1860 Ma, and 590–520 Ma from the Ubendian-Usagaran Belt. Arc–back-arc signatures from eclogites imply that their mafic protoliths were probably eroded from arc basalt above a subduction zone and were channeled into a subduction zone as mélanges and got metamorphosed. The Ubendian-Usagaran events also record rifting, arc and back-arc magmatism, collisional, and hydrothermal events that preceded or followed HP-LT tectonic events. Our new tectonic subdivision of the Ubendian Belt is described as: (1) the western Ubendian Corridor, mainly composed of two Proterozoic suture zones (subduction at 2000, 1920–1890, Ma and 590–500 Ma) in the Ufipa and Nyika Terranes; (2) the central Ubendian Corridor, predominated by metamorphosed mafic-ultramafic rocks in the Ubende, Mbozi, and Upangwa Terranes that include the 1890–1860 Ma eclogites with mid-ocean ridge basalt affinity in the Ubende Terrane; and (3) the eastern Ubendian Corridor (the Katuma and Lupa Terranes), characterized by reworked Archean crust.
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Warburton, John. "The ophiolite-bearing Schistes lustrés nappe in Alpine Corsica: A model for the emplacement of ophiolites that have suffered HP/LT metamorphism." In Geological Society of America Memoirs, 313–32. Geological Society of America, 1986. http://dx.doi.org/10.1130/mem164-p313.

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Conference papers on the topic "HP metamorphism"

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Zhang, Lijuan, and Lifei Zhang. "Massive Production of Abiotic Methane during Subduction Zone HP-UHP Metamorphism in SW Tianshan, China." In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.3110.

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Aoki, Kazumasa, and Yoshiki Seo. "THREE DISTINCT METAMORPHIC UNITS IN THE CRETACEOUS SANBAGAWA HP BELT INFERRED FROM LA-ICP-MS ZIRCON U-PB DATING." In GSA Annual Meeting in Indianapolis, Indiana, USA - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018am-317553.

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Hamelin, Clémentine, Andrea R. Biedermann, Donna L. Whitney, and Christian Teyssier. "A NOVEL APPROACH FOR EXTRACTING EARLY, HIGHER-P RECORDS FROM ROCKS OVERPRINTED AT HP-LT CONDITIONS: INTEGRATING METAMORPHIC PETROLOGY AND MAGNETIC FABRICS OF AMPHIBOLITES EXHUMED IN A MIGMATITE DOME." In GSA Annual Meeting in Indianapolis, Indiana, USA - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018am-321150.

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