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Retentiveness of rare earth elements in garnet with implications for garnet Lu-Hf chronology J. Metamorph. Geol. (IF 3.4) Pub Date : 2024-03-13 Matthijs A. Smit, Johannes C. Vrijmoed, Erik E. Scherer, Klaus Mezger, Ellen Kooijman, Melanie Schmitt-Kielman, Lorraine Tual, Carl Guilmette, Lothar Ratschbacher
Incorporation of rare earth elements (REE) in garnet enables garnet chronology (Sm-Nd, Lu-Hf), and imparts a garnet-stable signature on cogenetic phases, which allows petrochronology and general petrogenetic tracing of garnet stability in minerals and melts. Constraints on the uptake and redistribution mechanisms, as well as on the diffusive behaviour of REE in garnet are required for allowing accurate
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Dehydration‐driven deformation of eclogite: Interplay between fluid discharge and rheology J. Metamorph. Geol. (IF 3.4) Pub Date : 2024-03-14 Michał Bukała, Károly Hidas, Iwona Klonowska, Christopher J. Barnes, Kathrin Fassmer, Jarosław Majka
Aqueous fluids released during dehydration of a subducting slab have a large effect on the rheology of the subduction interface. While high‐pressure experiments and natural‐case studies link deformation with critical dehydration reactions during eclogitization, the exact interplay between these processes remains ambiguous. To investigate fluid–rock interaction and associated deformation at high‐pressure
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Featured Cover J. Metamorph. Geol. (IF 3.4) Pub Date : 2024-03-13 Shun Guo, Anping Chen, Xirun Cai, Yi Chen, Pan Tang, Qiuli Li
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Issue Information J. Metamorph. Geol. (IF 3.4) Pub Date : 2024-03-13
No abstract is available for this article.
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The metamorphic footprint of western Laurentia preserved in subducted rocks from southern Australia J. Metamorph. Geol. (IF 3.4) Pub Date : 2024-03-12 Dillon A. Brown, Laura J. Morrissey, Martin Hand, Jacob A. Mulder, Benjamin Wade, Vitor Barrote
Polymetamorphic metapelitic rocks in central‐west Tasmania, southern Australia, contain high‐pressure mineral assemblages that formed during Cambrian‐aged subduction and relict garnet with published Lu–Hf ages of c. 1285–1240 Ma. These garnet ages, along with published detrital zircon data from throughout western Tasmania and western North America, have been used to propose the presence of Mesoproterozoic
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Mechanisms and durations of metamorphic garnet crystallization in the lower nappes of the Caledonian Kalak Nappe Complex, Arctic Norway J. Metamorph. Geol. (IF 3.4) Pub Date : 2024-03-12 Maria Thereza A. G. Yogi, Fred Gaidies, Olivier K. A. Heldwein, A. Hugh N. Rice
The 3D microstructure and compositional zoning of garnet populations in micaschists from the Kolvik and Bekkarfjord nappes indicate the quasi‐equilibration of their major components across the rock matrices during interface‐controlled, size‐independent garnet growth. There is microstructural evidence for foliation‐parallel, small‐scale resorption of garnet rims in the Kolvik Nappe, influencing the
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Metamorphic evolution and geological significance of Early Palaeozoic high‐pressure granulites from the East Kunlun (NW China) J. Metamorph. Geol. (IF 3.4) Pub Date : 2024-03-08 An‐Ping Chen, Hong‐Fu Zhang, Ming‐Jie Zhang, Xiao‐Qi Zhang
Granulites and eclogites are useful for revealing the thermal and tectonic evolution of orogens. Early Palaeozoic granulites and associated eclogites in the East Kunlun Orogenic Belt (EKOB) display contrasting metamorphic age. Such asynchronous granulite–eclogite associations have rarely been reported, and the geological significance of their existence remains to be further explored. In this study
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Ultrahigh thermal gradient granulites in the Narryer Terrane, Yilgarn Craton, Western Australia, provide a window into the composition and formation of Archean lower crust J. Metamorph. Geol. (IF 3.4) Pub Date : 2024-02-21 Naomi M. Tucker, Johannes Hammerli, Anthony I. S. Kemp, Matthew L. Rowe, Chris M. Gray, Heejin Jeon, Martin J. Whitehouse, Malcolm P. Roberts
Granulites from the Narryer Terrane in the northern Yilgarn Craton, Australia, record evidence for high to ultrahigh thermal gradients during the Meso–Neoarchean. U–Pb zircon ages reflect a complex history of high‐grade, prolonged and poly‐phase metamorphism, with evidence for several thermal pulses at ca. 2745–2725, ca. 2690–2660, and ca. 2650–2610 Ma. Forward phase equilibrium modeling on rocks with
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Deformation-induced graphitization and muscovite recrystallization in a ductile fault zone J. Metamorph. Geol. (IF 3.4) Pub Date : 2024-02-14 M. Rebecca Stokes, Aaron M. Jubb, Ryan J. McAleer, David L. Bish, Robert P. Wintsch
A suite of slate samples collected along a 2 km transect crossing the Lishan fault in central Taiwan were evaluated to assess the role of ductile deformation in natural graphitization at lower greenschist facies metamorphic conditions. The process of natural aromatization, or graphitization, of an organic precursor is well established as a thermally driven process; however, experimental studies have
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A buried gneiss dome in the northern Gawler Craton: The record of early Mesoproterozoic (ca. 1600–1560 Ma) extension in southern Proterozoic Australia J. Metamorph. Geol. (IF 3.4) Pub Date : 2024-02-13 Jie Yu, Martin Hand, Laura J. Morrissey, Justin L. Payne
Mabel Creek Ridge, in the northern Gawler Craton, is a granulite-facies domain recording early Mesoproterozoic metamorphism, flanked by less metamorphosed rocks and dissected by crustal-scale divergent structures. The nature of early Mesoproterozoic events is poorly understood due to the lack of basement outcrop. Calculated metamorphic phase diagrams and geochronology are used to decipher the tectonic
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Paleoproterozoic ultrahigh-temperature mafic granulites with a high-pressure prograde path from the Alxa Block: Implications on the tectonic evolution of the Khondalite Belt, North China Craton J. Metamorph. Geol. (IF 3.4) Pub Date : 2024-02-08 Lei Zou, Jing-Hui Guo, Li-Fei Zhang, Guang-Yu Huang, Shu-Juan Jiao, Zhong-Hua Tian, Da Wang, Ping-Hua Liu
Ultrahigh-temperature (UHT) granulites, a prominent feature of Paleoproterozoic orogenic belts, preserve a record of geodynamic processes during the Precambrian (Archean–Paleoproterozoic). Quantitative pressure–temperature–time (P–T–t) paths of these UHT granulites can constrain the tectonic processes and metamorphic evolution in such a tectonic regime. Here, UHT mafic granulites with a high-pressure
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Cold deep subduction of Indian continental crust and release of ultrahigh-pressure fluid during initial exhumation: Insights from coesite-bearing eclogite-vein systems in Kaghan Valley, Pakistan J. Metamorph. Geol. (IF 3.4) Pub Date : 2024-02-07 Shun Guo, Anping Chen, Xirun Cai, Yi Chen, Pan Tang, Qiuli Li
The ultrahigh-pressure (UHP) eclogites from the Kaghan Valley in Pakistan, which formed by the deep subduction of the Indian plate beneath the Asian plate in the Eocene, contain complex metamorphic vein systems (including both isolated veins and vein networks), with mineral assemblages of epidote + quartz + kyanite + phengite ± omphacite ± garnet. The investigations on the Kaghan UHP eclogite-vein
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Issue Information J. Metamorph. Geol. (IF 3.4) Pub Date : 2024-02-01
No abstract is available for this article.
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Paleoarchean metamorphism in the Acasta Gneiss Complex: Constraints from phase equilibrium modelling and in situ garnet Lu–Hf geochronology J. Metamorph. Geol. (IF 3.4) Pub Date : 2024-01-25 Jonas Kaempf, Tim E. Johnson, Chris Clark, Julian Alfing, Michael Brown, Pierre Lanari, Kai Rankenburg
The oldest known evolved (felsic) rocks on Earth (c. 4.03 Ga) are found in the Acasta Gneiss Complex (AGC) in north-western Canada and represent a fundamental keystone in unravelling the geological processes governing crustal growth and differentiation during the Hadean and early Archean. Although the timing of multiple episodes of magmatism, metamorphism and deformation in these tonalitic gneisses
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Influence of high-strain deformation on major element mobility in garnet: Nanoscale evidence from atom probe tomography J. Metamorph. Geol. (IF 3.4) Pub Date : 2024-01-25 Renelle Dubosq, Alfredo Camacho, Anna Rogowitz, Siyuan Zhang, Baptiste Gault
Garnet is a common rock-forming mineral that occurs in a variety of rock types and over a wide range of pressure (P)–temperature (T) conditions in the Earth's lithosphere. Because garnet is considered a high-strength mineral stable across an extensive range of conditions (1–25 GPa, <300–2000°C), it is generally accepted that garnets can retain their microstructures and chemical composition during deformation
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Eclogite with biotite porphyroblasts—Which conditions are responsible for their formation? An example from the northern Fleur-de-Lys Supergroup, Newfoundland, Canada J. Metamorph. Geol. (IF 3.4) Pub Date : 2024-01-22 Hans-Joachim Massonne
An eclogite from the Early Palaeozoic Fleur-de-Lys Supergroup in Newfoundland was studied because of its biotite porphyroblasts, which very rarely occur in this rock type. Thermodynamic modelling suggests that eclogitic biotite in common metabasite (former basalt–gabbro) is limited to (1) bulk-rock compositions, which are relatively rich in Fe2+ and K and poor in Fe3+, and (2) the low-pressure range
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An Iapetus origin for a layered eclogite complex in the northern Western Gneiss Region, Scandinavian Caledonides J. Metamorph. Geol. (IF 3.4) Pub Date : 2024-01-17 Charlotte Möller, Yue Cai, Hannes K. Brueckner, Kristoffer Szilas, Martin J. Whitehouse
The Western Gneiss Region (WGR) is a Precambrian basement domain in the Scandinavian Caledonides and one of the world's largest high- and ultrahigh-pressure terranes. The south–central WGR underwent regional eclogite facies metamorphism 415–400 Ma ago when Baltica subducted beneath Laurentia, during the Scandian orogeny. Eclogites in the WGR group into two traditional types: (1) Precambrian mafic intrusions
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Issue Information J. Metamorph. Geol. (IF 3.4) Pub Date : 2024-01-11
No abstract is available for this article.
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The inhibited response of accessory minerals during high-temperature reworking J. Metamorph. Geol. (IF 3.4) Pub Date : 2023-12-21 Samantha March, Martin Hand, Laura Morrissey, David Kelsey
U–Pb zircon and monazite geochronology are considered to be among the most efficient and reliable methods for constraining the timing of high-temperature (HT) metamorphic events. However, the reliability of these chronometers is coupled to their ability to participate in reactions. A case study examining the responsiveness of zircon and monazite has been conducted using granulite facies metapelitic
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Disruption of a high-pressure unit during exhumation: Example of the Cycladic Blueschist unit (Thera, Ios and Naxos islands, Greece) J. Metamorph. Geol. (IF 3.4) Pub Date : 2023-12-21 Alexandre Peillod, Clifford G. C. Patten, Kirsten Drüppel, Aratz Beranoaguirre, Armin Zeh, Dominik Gudelius, Simon Hector, Jarosław Majka, Barbara I. Kleine-Marshall, Andreas Karlson, Axel Gerdes, Jochen Kolb
Reconstructing the original geometry of a high-pressure tectonic unit is challenging but important to understand the mechanisms of mountain building. While a single nappe is subducted and exhumed, nappe-internal thrusts may disrupt it into several subunits. The Middle-CBU nappe of the Cycladic Blueschist Unit (Hellenide subduction orogen, Greece) shows evidence of such disruption along a Trans-Cycladic-Thrust
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Redistribution of heat-producing elements during melting of Archean crust J. Metamorph. Geol. (IF 3.4) Pub Date : 2023-12-11 Carson Kinney, Jillian Kendrick, Manuel Duguet, Chris Yakymchuk
Heat generated from the decay of K, Th, and U plays a fundamental role in the differentiation and stabilization of Earth's continental crust. This is particularly important in the construction of Archean cratons that form the nuclei of Earth's continents. The Kapuskasing uplift is a rare exposure of an Archean-age crustal cross-section that provides a snapshot of crustal melting, differentiation, and
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Assessing the importance of H2O content in the tectono-metamorphic evolution of shear zones: A case study from the Dora-Maira Massif (Western Alps) J. Metamorph. Geol. (IF 3.4) Pub Date : 2023-12-01 Sara Nerone, Alessandro Petroccia, Fabiola Caso, Davide Dana, Andrea Maffeis
Metamorphic reactions are commonly driven to completion within shear zones thanks to fluid circulation, making the re-equilibration of the mineral assemblage one of the dominant processes. Despite the important role of H2O in such processes, forward thermodynamic modelling calculations commonly assume either H2O-saturated conditions or only fluid loss during prograde evolution to peak conditions. These
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Issue Information J. Metamorph. Geol. (IF 3.4) Pub Date : 2023-11-02
No abstract is available for this article.
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The origin of calcite in calc-silicate rocks from the Kokchetav ultrahigh-pressure metamorphic complex J. Metamorph. Geol. (IF 3.4) Pub Date : 2023-11-01 Anastasia O. Mikhno, Anton F. Shatskiy, Andrey V. Korsakov, Yulia G. Vinogradova, Jasper Berndt, Stephan Klemme, Sergey V. Rashchenko
Understanding calcite genesis in ultrahigh-pressure crustal rocks is a key to the reconstruction of the evolution of ultrahigh-pressure metacarbonate rocks. Here, we present new data and a new model on the genesis and the P–T conditions of the formation of calcite found in the ultrahigh-pressure calc-silicate rocks from the Kokchetav massif. In the studied sample aragonite inclusions coexist with Type
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Constraints on the Palaeoproterozoic tectono-metamorphic evolution of the Lewisian Gneiss Complex, NW Scotland: Implications for Nuna assembly J. Metamorph. Geol. (IF 3.4) Pub Date : 2023-10-19 Silvia Volante, Annika Dziggel, Jesse B. Walters, Noreen J. Evans, Maximilian Herbst, Richard Albert Roper
Despite extensive investigation, the tectono-thermal evolution of the Archean crust in the Lewisian Gneiss Complex in NW Scotland (LGC) is debated. Most U–Pb zircon geochronological and metamorphic studies have focused on rocks from the central region of the mainland LGC, where granulite facies assemblages associated with the oldest (Badcallian) tectono-metamorphic event at c. 2.75 Ga are overprinted
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Eclogite thermobarometry: The consistency between conventional thermobarometry and forward phase-equilibrium modelling J. Metamorph. Geol. (IF 3.4) Pub Date : 2023-10-19 David Hernández-Uribe, Robert M. Holder, Juan D. Hernández-Montenegro
Eclogite thermobarometry is crucial for constraining the depths and temperatures to which oceanic and continental crust subduct. However, obtaining the pressure and temperature (P–T) conditions of eclogites is complex as they commonly display high-variance mineral assemblages, and the mineral compositions only vary slightly with P–T. In this contribution, we present a comparison between two independent
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Chromium in minerals as tracer of the polycyclic evolution of eclogite and related metabasite from the Pohorje Mountains, Slovenian Eastern Alps J. Metamorph. Geol. (IF 3.4) Pub Date : 2023-10-11 Botao Li, Hans-Joachim Massonne
Significantly different peak pressure–temperature (P–T) conditions (18–26 kbar and 630–760°C versus 29–37 kbar and 750–940°C) have previously been published for eclogite and related metabasites from the south-eastern flank of the Pohorje Mountains in Slovenia. These rocks can show a bimodal distribution of chromium in the rock-forming minerals, particularly garnet, the role of which in their metamorphic
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Polymetamorphism during the Grenvillian Orogeny in SE Ontario: Results from trace element mapping, in situ geochronology, and diffusion geospeedometry J. Metamorph. Geol. (IF 3.4) Pub Date : 2023-09-16 F. Gaidies, T. Mccarron, A. D. Simpson, R. M. Easton, S. Glorie, B. Putlitz, K. Trebus
The Flinton Group is a metasedimentary succession of the Grenville Province in SE Ontario, potentially allowing insight into the tectono-thermal evolution of continental crust during the Mesoproterozoic. At its Green Bay locality, Flinton Group metapelites of the staurolite zone contain abundant, post-kinematic garnet porphyroblasts. Whereas the larger garnet crystals are typically impinged, smaller
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Formation of low-pressure reaction textures during near-isothermal exhumation of hot orogenic crust (Bohemian Massif, Austria) J. Metamorph. Geol. (IF 3.4) Pub Date : 2023-09-14 Dominik Sorger, Christoph A. Hauzenberger, Fritz Finger, Manfred Linner, Etienne Skrzypek, Simon Schorn
Two types of aluminous paragneiss from the Loosdorf complex (Bohemian Massif, NE Austria) contain coarse-grained granulite assemblages and retrograde reaction textures that are investigated to constrain the post-peak history of the Gföhl unit in the southern Bohemian Massif. Both types have a peak assemblage garnet–biotite–sillimanite–plagioclase–K-feldspar–quartz–granitic melt ± kyanite ± ilmenite
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Origin of Erzgebirge ultrahigh-pressure garnetite: Formation from a basaltic protolith by serpentinization-assisted metasomatism? J. Metamorph. Geol. (IF 3.4) Pub Date : 2023-09-07 Esther Schmädicke, Thomas M. Will
Erzgebirge ultrahigh-pressure (UHP) garnet peridotite includes scarce layers of garnet pyroxenite, nodules of garnetite and, very rarely, of eclogite. Peridotite-hosted eclogite shows the same subalkali-basaltic bulk rock composition, mineral assemblage and peak conditions as gneiss-hosted eclogite present in the same UHP unit. Garnetite has considerably more Mg, moderately enhanced Ca and Fe and significantly
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Issue Information J. Metamorph. Geol. (IF 3.4) Pub Date : 2023-09-01
No abstract is available for this article.
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Long-lived high-grade metamorphism in southern India: Constraints from charnockites and sapphirine-bearing semipelitic granulites from the Madurai Block J. Metamorph. Geol. (IF 3.4) Pub Date : 2023-08-31 Ashish Kumar Tiwari, Tapabrato Sarkar, Sourav Karmakar, Nilanjana Sorcar, Sneha Mukherjee
The Granulite Terrane of Southern India is a collage of Mesoarchean–Neoproterozoic crustal blocks that underwent high-grade metamorphism associated with the final assembly of the Gondwana supercontinent during late Neoproterozoic–Cambrian. Here, we investigate the charnockites and associated sapphirine-bearing semipelitic granulites from the eastern part of the Madurai Block (MB). We present new petrographic
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Petrochronologic constraints on inverted metamorphism, terrane accretion, thrust stacking, and ductile flow in the Gneiss Dome belt, northern Appalachian orogen J. Metamorph. Geol. (IF 3.4) Pub Date : 2023-08-22 Ian W. Hillenbrand, Michael L. Williams, Emily M. Peterman, Michael J. Jercinovic, Craig W. Dietsch
Gneiss domes are an integral element of many orogenic belts and commonly provide tectonic windows into deep crustal levels. Gneiss domes in the New England segment of the Appalachian orogen have been classically associated with diapirism and fold interference, but alternative models involving ductile flow have been proposed. We evaluate these models in the Gneiss Dome belt of western New England with
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Issue Information J. Metamorph. Geol. (IF 3.4) Pub Date : 2023-08-01
No abstract is available for this article.
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A wealth of P–T–t information from metasediments in the HP–UHP terrane of the Pohorje Mountains, Slovenia, elucidates the evolution of the Eastern Alps J. Metamorph. Geol. (IF 3.4) Pub Date : 2023-07-26 Botao Li, Hans-Joachim Massonne, Xiaoping Yuan
Contrasting views exist in regard of the evolution of metamorphic rocks in the southeastern Pohorje Mountains (Mts), located in the southeastern Eastern Alps. Major debated points are whether micaschists have experienced ultrahigh-pressure metamorphism in the Late Cretaceous (Eo-Alpine) and whether they were continuously exhumed or experienced a multiple subduction–exhumation process from that time
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40Ar/39Ar dates controlled by white mica deformation and strain localization: Insights from comparing in situ laser ablation and single-grain fusion techniques J. Metamorph. Geol. (IF 3.4) Pub Date : 2023-07-26 Christopher J. Barnes, David A. Schneider, Jarosław Majka, Alfredo Camacho, Michał Bukała, Adam Włodek
In situ laser ablation and single-grain fusion 40Ar/39Ar geochronological techniques were directly compared using white mica from nine metasedimentary rocks from the Vaimok Lens of the Seve Nappe Complex (SNC) in the Scandinavian Caledonides. Seven of the rocks are from the eclogite-bearing Grapesvare nappe within the lens that is defined by D2 structures (S2 and F2), which were formed during exhumation
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Issue Information J. Metamorph. Geol. (IF 3.4) Pub Date : 2023-07-04
No abstract is available for this article.
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Pressure–temperature evolution of the basement and cover sequences on Ios, Greece: Evidence for subduction of the Hercynian basement J. Metamorph. Geol. (IF 3.4) Pub Date : 2023-06-27 Oliver M. Wolfe, Frank S. Spear, Jay B. Thomas, Eric M. Hasegawa, Grant T. Libby, John T. Cheney
High-pressure rocks from the island of Ios in the Greek Cyclades were examined to resolve the P–T conditions reached during subduction of the two distinct lithotectonic units that are separated by the South Cycladic Shear Zone (SCSZ)—the footwall complex composed of Hercynian basement gneisses, schists and amphibolites, and the hangingwall complex composed of blueschists and eclogites. A combination
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P–T–t conditions of Early Palaeozoic low-P high-T granulite facies metamorphism in the southern Truong Son Belt, Central Vietnam J. Metamorph. Geol. (IF 3.4) Pub Date : 2023-06-22 Nam Nguyen Duc, Ching-Hua Lo, Tadashi Usuki, Yoshiyuki Iizuka, Pham Binh
High-grade metamorphic rocks are widely exposed along the SE–NW- to E–W-trending shear zones in the Truong Son Belt, Central Vietnam, but few petrological studies have been conducted in this area. Herein, we report the occurrence of mylonitized granulites that crop out along the Dai Loc shear zone in the southernmost Truong Son Belt. Detailed petrographic analysis, geochemistry and P–T–t estimates
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Issue Information J. Metamorph. Geol. (IF 3.4) Pub Date : 2023-06-02
No abstract is available for this article.
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Consistent garnet Lu–Hf and Sm–Nd ages indicate short-lived high-pressure metamorphism and rapid subduction in oceanic subduction belt: An example from the Changning–Menglian orogenic belt, southeastern Tibetan Plateau J. Metamorph. Geol. (IF 3.4) Pub Date : 2023-05-26 Ying Zhou, Hao Cheng, Zhi-min Peng, Besim Dragovic, Yu-zhen Fu, Kai-Yang Du
The integration of garnet-based petrologic constraints with multimineral geochronologic data in eclogites and blueschists allows the timing and rate of subduction zone metamorphism to be constrained. We present a combined garnet Lu–Hf/Sm–Nd and zircon/rutile U–Pb geochronology study on three eclogites, a garnet-bearing blueschist, and a micaschist from the Changning–Menglian orogenic belt, a newly
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Growth of kyanite and Fe-Mg chloritoid in Fe2O3-rich high-pressure–low-temperature metapelites and metapsammites: A case study from the Massa Unit (Alpi Apuane, Italy) J. Metamorph. Geol. (IF 3.4) Pub Date : 2023-05-26 Samuele Papeschi, Federico Rossetti, Jesse B. Walters
Chloritoid and kyanite coexist in metapelites from the high-pressure/low-temperature Massa Unit in the Alpi Apuane metamorphic complex (Northern Apennines, Italy). The composition of chloritoid is extremely variable throughout the Massa Unit. Fe-chloritoid occurs in association with hematite-free, graphite-bearing schists, whereas strongly zoned Fe-Mg chloritoid is found with hematite and kyanite.
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Garnet growth and mineral geochronology constrains the diachronous Neoproterozoic convergent evolution of the southern Dom Feliciano Belt, Uruguay J. Metamorph. Geol. (IF 3.4) Pub Date : 2023-05-15 Jack James Percival, Jiří Konopásek, Pedro Oyhantçabal, Jiří Sláma, Robert Anczkiewicz
The Dom Feliciano Belt of southern Brazil and Uruguay represents part of a larger Neoproterozoic orogenic system formed during the amalgamation of Western Gondwana. The hinterland and foreland domains in parts of the belt preserve deformation structures and metamorphic assemblages that developed during early crustal thickening from c. 650 Ma. However, the metamorphic history of the southern foreland
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Complex geochronological record of an emblematic Variscan eclogite (Haut-Allier, French Massif Central) J. Metamorph. Geol. (IF 3.4) Pub Date : 2023-05-15 Luc de Hoÿm de Marien, Pavel Pitra, Marc Poujol, Nathan Cogné, Florence Cagnard, Benjamin Le Bayon
Two eclogite samples from the Haut-Allier record a prograde evolution from ~20 kbar, 650°C to 750°C, 22–23 kbar followed by heating up to 850–875°C and partial melting. Incipient decompression in high-pressure granulite facies conditions (19.5 kbar, 875°C) was followed by exhumation to high-temperature amphibolite facies conditions (<9 kbar, 750–850°C). Following a detailed geochemical, petrological
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Was cratonic Asia deeply subducted beneath the Pamir? Evidence from P–T conditions and tectonic affinities of Cenozoic Pamir crustal xenoliths J. Metamorph. Geol. (IF 3.4) Pub Date : 2023-05-01 Yi-Peng Li, Lin Ding, Alexander C. Robinson, De-Liang Liu, Jing Xie, Li-Yun Zhang, Chen-Yuan Zhao, Ya-Hui Yue, Yiduo Liu, Ilhomjon Oimuhammadzoda, Mustafo Gadoev, Negmat Rajabov
One of the most striking geological features of the Pamir is the south-dipping lithospheric slab beneath the orogen characterized by an intracontinental Wadati-Benioff zone. A widely accepted hypothesis over the past 40 years interprets the slab to represent southward subducted cratonic Asian continental lithosphere, which predicts significant cratonic Asia-sourced crustal materials (e.g., Tarim Basin)
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Archean ultrahigh temperature event in the northwestern Superior Province, Canada: Metamorphic evolution and tectonic implications of the Pikwitonei Granulite Domain J. Metamorph. Geol. (IF 3.4) Pub Date : 2023-04-16 Changqing Yin, Xiaoman Wang, Shoufa Lin, Chris G. Couëslan, Christian O. Böhm, Jiahui Qian, Jian Zhang, Yanfei Xia, Wenxuan Li
The Pikwitonei Granulite Domain (PGD), located in the northwestern Superior Province, is one of the largest Neoarchean high-grade metamorphic domains in the world, and is a key to understanding the Neoarchean crustal evolution of the Superior Province. Here we report results of a study on ultrahigh temperature (UHT) granulites with a sapphirine + quartz-bearing peak assemblage from the Sipiwesk Lake
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The origin and compositions of melt inclusions in an Al2SiO5-free paragneiss from the Namche Barwa Complex in the Eastern Himalayan Syntaxis J. Metamorph. Geol. (IF 3.4) Pub Date : 2023-04-12 Qiang Liu, Penglei Liu, Xin Li, Junfeng Zhang
Melt inclusions (MIs) in high-temperature metamorphic rocks provide a unique window into crustal anatexis in collisional orogenic belts and have been widely used to characterize compositions of anatectic melts as well as melting mechanisms. In this study, MIs hosted by peritectic garnet were for the first time identified in an Al2SiO5-free graywacke-type paragneiss from the Namche Barwa Complex, the
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Issue Information J. Metamorph. Geol. (IF 3.4) Pub Date : 2023-04-03
No abstract is available for this article.
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Late Neoproterozoic–Cambrian eclogites and high-pressure granulites in the Central Qilian terrane (China) record the earliest subduction of Proto-Tethyan Ocean in the eastern Tethysides J. Metamorph. Geol. (IF 3.4) Pub Date : 2023-03-17 Hao Wang, Wenjiao Xiao, Rui Li, Hongxu Chen, Zhou Tan, Qigui Mao
The Central Qilian terrane (CQT) of the northern Tibetan Plateau played a key role in the tectonic evolution of the Proto-Tethyan Ocean in the Tethysides, but its formation and tectonic attribution have been hotly debated. Here, we report the discovery of eclogites and HP mafic granulites in the Beidahe Complex of the western CQT. These occur as blocks of various sizes within a sequence of metavolcanic–sedimentary
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The temporal evolution of subduction initiation in the Samail ophiolite: High-precision U–Pb zircon petrochronology of the metamorphic sole J. Metamorph. Geol. (IF 3.4) Pub Date : 2023-03-10 Matthew Rioux, Joshua M. Garber, Michael Searle, James L. Crowley, Sally Stevens, Mark Schmitz, Andrew Kylander-Clark, Kayla Leal, Tyler Ambrose, Andrew J. Smye
High-precision dating of the metamorphic sole of ophiolites can provide insight into the tectonic evolution of ophiolites and subduction zone processes. To understand subduction initiation beneath a young, well-preserved and well-characterized ophiolite, we performed coupled zircon laser-ablation inductively coupled mass spectrometry trace element analyses and high-precision isotope dilution-thermal
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Pressure–temperature paths of tectonic blocks in mélange: Recording thermal evolution of a subduction channel at an initial stage of subduction J. Metamorph. Geol. (IF 3.4) Pub Date : 2023-03-09 Toru Takeshita, Takeshi Imayama, Mizuho Ando, Yuto Kimura, Marie Python
We investigated the tectonic evolution of amphibolite and blueschist tectonic blocks in the serpentinite- or pelite-matrix mélange, which are distributed at the highest structural level of the high-P/T type Kamuikotan metamorphic rocks in northern Japan. The tectonic blocks in this study area are divided into six rock types: garnet-epidote amphibolite, epidote amphibolite, amphibolite, plagioclase-poor
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Issue Information J. Metamorph. Geol. (IF 3.4) Pub Date : 2023-03-02
No abstract is available for this article.
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A rutile and titanite record of subduction fluids: Integrated oxygen isotope and trace element analyses in Franciscan high-pressure rocks J. Metamorph. Geol. (IF 3.4) Pub Date : 2023-02-27 F. Zeb Page, Craig D. Storey
In situ oxygen analysis of garnet in eclogite and related rocks is increasingly being used to probe the composition of subduction fluids. However, in many cases, these samples contain textural signs of both fluid flow and retrograde metamorphism, some of which may take place outside the garnet stability field. In order to test the connection between polymetamorphism and fluid infiltration, rutile rimmed
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To be or not to be Alpine: New petrological constraints on the metamorphism of the Chenaillet Ophiolite (Western Alps) J. Metamorph. Geol. (IF 3.4) Pub Date : 2023-02-26 Alberto Corno, Chiara Groppo, Alessandro Borghi, Pietro Mosca, Marco Gattiglio
The Chenaillet Ophiolite represents a very well-preserved portion of Ligurian-Piedmont ocean in the Western Alps. It is formed from an oceanic lithospheric succession comprising exhumed mantle, various mafic intrusives (i.e., gabbro sensu lato), and a world-renowned sequence of pillow basalts. Apart from scarce breccias closely related to oceanic lithosphere, no sedimentary cover is exposed. Historically
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Prograde zircon growth in migmatites J. Metamorph. Geol. (IF 3.4) Pub Date : 2023-02-23 Chris Yakymchuk
Empirical studies of zircon in migmatites document features compatible with growth during heating at suprasolidus conditions. However, numerical modelling of zircon behaviour suggests that suprasolidus zircon is expected to grow only during cooling and melt crystallization. Here, phase equilibrium modelling coupled with mineral–melt Zr partitioning is used in an attempt to reconcile the observations
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Carboniferous–Triassic tectonic and thermal evolution of the middle crust section of the Dervio–Olgiasca Zone (Southern Alps) J. Metamorph. Geol. (IF 3.4) Pub Date : 2023-02-23 Christophe Real, Kathrin Fassmer, Rodolfo Carosi, Nikolaus Froitzheim, Daniela Rubatto, Chiara Groppo, Carsten Münker, Simona Ferrando
A well-preserved remnant of the middle crust of the former Adriatic passive margin is exposed in the Southern Alps (Italy). The Dervio–Olgiasca Zone is located south of the Insubric Line along the northern part of Como Lake and, because of the lack of Alpine overprint, provides favourable conditions to investigate the pre-Alpine (rift-related) history. We reconstruct the P–T–t–d evolution of the Adria
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Cover Image J. Metamorph. Geol. (IF 3.4) Pub Date : 2023-02-02 Huining Wang, Fulai Liu, Zaibo Sun, Lei Ji, Jia Cai, Jianjiang Zhu, Kun Zhou, Wei Wang
The cover image is based on the Review Article Gabbroic eclogites formed during rapid and cold subduction of the Paleo-Tethys oceanic lithosphere in the Changning–Menglian orogenic belt, southeastern Tibetan plateau by Huining Wang et al., https://doi.org/10.1111/jmg.12694.
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Issue Information J. Metamorph. Geol. (IF 3.4) Pub Date : 2023-02-02
No abstract is available for this article.
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Incompatibility between serpentinization and epidote formation in the lower oceanic crust: Evidence from the Oman Drilling Project J. Metamorph. Geol. (IF 3.4) Pub Date : 2023-02-04 Toshio Nozaka, Yamato Tateishi
It is a general tendency that epidote, which is a typical greenschist facies mineral, is scarce in the lower oceanic crust, in spite of the widespread occurrence of the other minerals indicative of similar temperature conditions such as chlorite, actinolite, prehnite and serpentine. To find the cause of this, we carried out petrological analyses of lower crustal rocks of the Oman ophiolite sampled
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Kinetics and pulses of zircon growth in migmatites beneath a volcanic arc: An example from the high-T Ryoke Complex, southwest Japan J. Metamorph. Geol. (IF 3.4) Pub Date : 2023-01-20 Kazuhiro Miyazaki, Takeshi Ikeda, Hideki Iwano, Takafumi Hirata, Tohru Danhara
We present an analysis of kinetics and pulses of zircon growth in migmatites formed at middle to lower crustal depths beneath a volcanic arc. Migmatites in high-T metamorphic complexes at active continental margins, such as in the Ryoke Complex of southwest Japan, are thought to have been produced beneath volcanic arcs. Thermal models suggest that melt advection supplies the heat to form such high-T