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HP-UHP metamorphism and tectonic evolution of orogenic belts (2019)

Zhang, Lifei [HerausgeberIn] ; Zhang, Zeming [HerausgeberIn] ; Schertl, Hans-Peter [HerausgeberIn] ; [et al.]

London : The Geological Society

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Call number: 9/M 07.0421(474)

In: Geological Society Special Publication

Description / Table of Contents: Abstract High pressure (HP) and ultrahigh pressure (UHP) metamorphic rocks play a key role in understanding the tectonic evolution of orogenic belts. They have typically experienced complex changes during subduction and exhumation processes arising from recrystallization, deformation, fluid–rock interactions and even partial melting, and may therefore carry valuable records of evolving geodynamic systems in an orogenic belt. This special publication addresses the current work on HP–UHP metamorphism and its relation to the tectonic evolution of orogenic belts. This special publication contains fifteen papers covering the important orogenic belts of the Himalaya, Dabie–Sulu, Tian Shan, North Qaidam and others that have been grouped into three parts: (I) new developments in the determination of metamorphic pressure–temperature (PT) conditions and their timing, (II) overview papers of well-known HP–UHP metamorphic belts and (III) research papers for some newly discovered HP–UHP belts.

Type of Medium: Monograph available for loan

Pages: vi, 362 Seiten , Illustrationen

ISBN: 978-1-78620-399-1

Series Statement: Geological Society Special Publication 474

URL: https://sp.lyellcollection.org/content/474/1/47

Language: English

Location: Reading room

Branch Library: GFZ Library

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HP–UHP Metamorphism and Tectonic Evolution of Orogenic Belts (2019)

Geological Society (London, U.K.) ; Zhang, Lifei ; Zhang, Zeming ; [et al.]

London : The Geological Society

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Keywords: high pressure ; ultrahigh pressure ; metamorphic rocks ; tectonic evolution ; orogenic belts ; Himalaya ; Tianshan ; China ; Tibet

Description / Table of Contents: Introduction --- HP–UHP metamorphism and tectonic evolution of orogenic belts: introduction / Lifei Zhang, Zeming Zhang, Hans-Peter Schertl and Chunjing Wei / Geological Society, London, Special Publications, 474, 1-4, 2 January 2019, https://doi.org/10.1144/SP474.15 --- New developments in the determination of metamorphic P–T conditions and their timing --- Tso Morari coesite eclogite: pseudosection predictions v. the preserved record and implications for tectonometamorphic models / Patrick J. O'Brien / Geological Society, London, Special Publications, 474, 5-24, 19 December 2018, https://doi.org/10.1144/SP474.16 --- Phase relations in metabasic rocks: constraints from the results of experiments, phase modelling and ACF analysis / C. J. Wei and Z. Z. Duan / Geological Society, London, Special Publications, 474, 25-45, 11 May 2018, https://doi.org/10.1144/SP474.10 --- Garnet Lu–Hf and Sm–Nd geochronology: a time capsule of the metamorphic evolution of orogenic belts / Hao Cheng / Geological Society, London, Special Publications, 474, 47-67, 11 May 2018, https://doi.org/10.1144/SP474.7 --- The validity of Ti-in-zircon thermometry in low temperature eclogites / Meng Lin, Guibin Zhang, Shuguang Song, Huijuan Li and Lijuan Zhang / Geological Society, London, Special Publications, 474, 69-87, 14 September 2018, https://doi.org/10.1144/SP474.13 --- Overview papers of well-known HP–UHP metamorphic belts --- Ultrahigh-pressure metamorphic rocks in the Dabie–Sulu orogenic belt: compositional inheritance and metamorphic modification / Yong-Fei Zheng, Zi-Fu Zhao and Ren-Xu Chen / Geological Society, London, Special Publications, 474, 89-132, 15 May 2018, https://doi.org/10.1144/SP474.9 --- Ultrahigh pressure metamorphism and tectonic evolution of southwestern Tianshan orogenic belt, China: a comprehensive review / Lifei Zhang, Yang Wang, Lijuan Zhang and Zeng Lü / Geological Society, London, Special Publications, 474, 133-152, 25 September 2018, https://doi.org/10.1144/SP474.12 --- Two contrasting accretion v. collision orogenies: insights from Early Paleozoic polyphase metamorphism in the Altun–Qilian–North Qaidam orogenic system, NW China / Jianxin Zhang, Chris Mattinson, Shengyao Yu, Yunshuai Li, Xingxing Yu, Xiaohong Mao, Zenglong Lu and Yingbao Peng / Geological Society, London, Special Publications, 474, 153-181, 18 May 2018, https://doi.org/10.1144/SP474.8 --- Geochronological enigma of the HP–UHP rocks in the Himalayan orogen / Hafiz Ur Rehman / Geological Society, London, Special Publications, 474, 183-207, 23 October 2018, https://doi.org/10.1144/SP474.14 --- The metamorphic evolution and tectonic significance of the Sumdo HP–UHP metamorphic terrane, central-south Lhasa Block, Tibet / Cong Zhang, Thomas Bader, Herman van Roermund, Jingsui Yang, Tingting Shen, Tian Qiu and Peng Li / Geological Society, London, Special Publications, 474, 209-229, 22 March 2018, https://doi.org/10.1144/SP474.4 --- Research papers for some newly discovered and/or less well understood HP–UHP belts --- Petrography, mineralogy and geochemistry of jadeite-rich artefacts from the Playa Grande excavation site, northern Hispaniola: evaluation of local provenance from the Río San Juan Complex / Hans-Peter Schertl, Walter V. Maresch, Sebastiaan Knippenberg, Andreas Hertwig, Adolfo López Belando, Reniel Rodríguez Ramos, Laura Speich and Corinne L. Hofman / Geological Society, London, Special Publications, 474, 231-253, 12 March 2018, https://doi.org/10.1144/SP474.3 --- Eclogites from the Marun-Keu Complex, Polar Urals, Russia: a record of hot subduction and sub-isothermal exhumation / Y. Y. Liu, A. L. Perchuk and P. Philippot / Geological Society, London, Special Publications, 474, 255-274, 22 March 2018, https://doi.org/10.1144/SP474.6 --- Two epochs of eclogite metamorphism link ‘cold’ oceanic subduction and ‘hot’ continental subduction, the North Qaidam UHP belt, NW China / Shuguang Song, Yaoling Niu, Guibin Zhang and Lifei Zhang / Geological Society, London, Special Publications, 474, 275-289, 22 March 2018, https://doi.org/10.1144/SP474.2 --- Early Cenozoic thickening and reworking of the eastern Gangdese arc, south Tibet: constraints from the Oligocene granitoids / Huixia Ding and Zeming Zhang / Geological Society, London, Special Publications, 474, 291-308, 16 May 2018, https://doi.org/10.1144/SP474.5 --- Thermal structure of the Dabie eclogite-bearing terrane revealed from the results of Ti-in-zircon thermometry / Jingbo Liu, Lingmin Zhang, Nanfei Cheng, Yijie Gao and Liewen Xie / Geological Society, London, Special Publications, 474, 309-330, 12 March 2018, https://doi.org/10.1144/SP474.1 --- Constraining the age of high-pressure metamorphism of paragneisses from the Eastern Himalayan Syntaxis using zircon petrochronology and phase equilibria / Zuolin Tian, Zeming Zhang and Xin Dong / Geological Society, London, Special Publications, 474, 331-352, 8 June 2018, https://doi.org/10.1144/SP474.11

Pages: Online-Ressource (VI, 362 Seiten) , Illustrationen, Diagramme, Karten

ISBN: 9781786204196

URL: https://sp.lyellcollection.org/content/474/1

Language: English

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Fluid-mediated modification of garnet interiors under ultrahigh-pressure conditions (2005)

Perchuk, Alexei L. ; Burchard, Michael ; Maresch, Walter V. ; [et al.]

Oxford, UK : Blackwell Science Ltd

Terra nova 17 (2005), S. 0

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ISSN: 1365-3121

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Geosciences

Notes: We report the results of a novel experimental study on eclogitic garnets with abundant inclusions of clinozoisite, quartz and rutile subjected to temperatures (T) of 800–1100 °C and a pressure (P) of 4 GPa, representative of ultrahigh-pressure (UHP) metamorphic terranes such as the Kokchetav massif, Saxonian Erzgebirge, etc. The experiments reveal extremely rapid recrystallization and partial melting of garnet interiors controlled by fluids liberated from the breakdown of the hydrous mineral inclusions. The traditional assumption that inclusions of minerals and primary fluid inclusions should be representative of the peak or even earlier metamorphic history cannot be strictly applied in this case. We argue that inclusions in UHP garnets may mirror P–T conditions postdating growth of the host crystal or even P–T conditions never actually experienced by the rock itself. The above modification of garnet interiors produces a typical patchy microstructure that occurs in natural eclogitic garnet from the diamond-bearing UHP Kokchetav massif.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1365-3121.2005.00647.x

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New occurrences of jadeitite, jadeite quartzite and jadeite-lawsonite quartzite in the Dominican Republic, Hispaniola: petrological and geochronological overview (2012)

Schertl, Hans-Peter ; Maresch, Walter V. ; Stanek, Klaus P. ; Hertwig, Andreas ; Krebs, Martin ; Baese, Rauno ; Sergeev, Sergey S.

Schweizerbart

In: European Journal of Mineralogy 24: 199-216.

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Publication Date: 2012-03-01

Description: New occurrences of jadeitite and jadeite-rich rocks have been discovered in the Rio San Juan Complex (RSJC) of the northern Dominican Republic in serpentinite mélanges associated with a former intra-oceanic subduction zone. Allochthonous blocks in lag deposits developed on the mélange outcrops or boulders in river beds are common. A very unusual feature for the RSJC is the occurrence of concordant layers and discordant veins of cm to dm thickness in blocks of jadeite±lawsonite- or omphacite-garnet-bearing blueschist of the mélange. Two suites of jadeite-rich rocks can be recognized. The first is represented by quartz-free jadeitite s.str. (〉90 vol% jadeite) found so far only as blocks and boulders. The second suite comprises quartz-bearing jadeitite s.str. grading into jadeitite quartzite (JQ), jadeite-lawsonite quartzite (JLQ) and jadeite-free lawsonite quartzite (LQ). The second suite is found both as blocks and boulders as well as layers and veins in blueschist blocks. One single occurrence of a cross-cutting omphacitite vein in blueschist has also been observed. Additional important phases so far found in both suites are omphacite, phengite, glaucophane, epidote, albite, calcite, titanite and zircon. Apatite and pumpellyite have only been identified in quartz-free jadeitite s.str.; almandine-rich garnet has so far been observed only in JLQ. The two suites of jadeite-bearing rocks occur in various shades of green, are fine- to coarse-grained, and usually equigranular. Mineral distribution is commonly homogeneous, but may be patchy in JLQ, giving this rock type a distinctly mottled appearance. Cathodoluminescence (CL) images show oscillatory zoning patterns in jadeite, zircon, apatite and calcite; this is evidence for crystallization from an aqueous fluid under open-system conditions. Zircons separated from a sample of quartz-free jadeitite s.str. contain primary inclusions of high-pressure matrix minerals such as jadeite and omphacite, indicating coeval zircon growth. The cores of the zircons yield ages of 114.9 ± 2.9 Ma, thus defining a crystallization age close to the initiation of subduction in the Rio San Juan Complex, when “warm” geotherms of ˜15°/km prevailed. These ages are in contrast with the crystallization ages of the blueschists hosting the second, quartz-bearing suite of jadeite-rich rocks. These range from 80 to 62 Ma, towards the end of subduction-zone activity at ˜55 Ma and “cool” geotherms of 8–9 °C/km. For the younger quartz-bearing suite, the combination of phengite compositions with the available P-T-t paths of the host blueschists suggests crystallization temperatures of ˜ 350 to ˜ 500 °C at minimum pressures of 15–16 kbar. The P-T conditions for the older quartz-free suite are more difficult to constrain, but the combination of phengite compositions with the prevailing geotherms in the young and warm subduction zone suggest minimum conditions of at least 500 °C and 11 kbar. However, temperatures and pressures as high as 600 °C and 15 kbar, as documented for jadeitites of similar age in the same subduction zone exposed in neighbouring eastern Cuba, are possible. Jadeitites and jadeite-rich rocks of the RSJC are thus interpreted to have crystallized over a time-span of = 60 Myr at initial temperatures of at least 500 °C, later evolving down to 350 °C in a single, thermally self-organizing, cooling subduction zone. The P-T conditions suggested for the younger quartz-bearing suite correlate well with those of jadeitite formation in Guatemala south of the Motagua Fault Zone, the only other occurrence world-wide where jadeitite with both lawsonite and quartz appears to be common. Further evidence is needed to corroborate that the older quartz-free suite represents another example of rare high-temperature jadeitite as documented in Cuba.

Print ISSN: 0935-1221

Electronic ISSN: 1617-4011

Topics: Geosciences

Published by Schweizerbart

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Multiple growth mechanisms of jadeite in Cuban metabasite (2012)

Maresch, Walter V. ; Grevel, Christiane ; Stanek, Klaus Peter ; Schertl, Hans-Peter ; Carpenter, Michael A.

Schweizerbart

In: European Journal of Mineralogy 24: 217-235.

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Publication Date: 2012-03-01

Description: Samples of rocks reported in the literature to be jadeite jade from the subduction-zone complex of the Escambray Massif in central Cuba have been studied by optical and transmission electron microscopy, electron microprobe and hot-cathode cathodoluminescence (CL) microscopy. Although these rocks are indeed rich in jadeite, the bulk rock composition generally conforms to MORB, with Na2O enriched by 〉 3 wt% and CaO depleted by 〉2 wt%. Al2O3 contents are unchanged. These changes are attributed to early pre-subduction spilitization of the ocean-floor protolith. Relics of magmatic augite preserving an ophitic texture are common. Disequilibrium textures are the rule. Extensively recrystallized rocks show fine, felty intergrowths of predominantly Al-rich glaucophane and jadeite, the latter with rims and patches of omphacite. TEM observations indicate extensive replacement of pyroxene by amphibole. Glaucophane developed rims of magnesiokatophorite and edenite. Chlorite and epidote are also present. Late development of actinolite, chlorite, epidote and albite is observed. Quartz is present. Less recrystallized samples with numerous large (〉1.5 mm) grains of augite show several types of sodic and sodic-calcic clinopyroxene development: (1) Topotactic replacement of magmatic pyroxene by jadeite and omphacite along a broad front encroaching upon the augite grain from the rock matrix. Jadeite dominates where presumably plagioclase was formerly present. Omphacite dominates where augite is internally replaced along cleavage and fractures. Late chlorite, taramite and ferropargasite replace these pseudomorphs. (2) Former plagioclase laths of the ophitic fabric are replaced by jadeite together with lesser omphacite in epitactic relationship with the enclosing augite. Former plagioclase-augite grain boundaries remain preserved. Late pumpellyite is associated with the omphacite. (3) Jadeite + omphacite + pumpellyite + chlorite with irregular grain boundaries dominate in the rock matrix between the augite relics, with idiomorphic crystals of epidote scattered throughout and in chlorite–epidote clusters. Pumpellyite is interpreted to be a late retrograde product. Quartz is present. (4) Jadeite + omphacite + chlorite assemblages, in which monomineralic sheaf-like jadeite aggregates are common, fill very thin (500–1500 µm) fractures criss-crossing the sample, including ophitic augite remnants. Cathodoluminescence microscopy shows that jadeite in the veins is distinctly different from CL in the other types of jadeite, showing features like oscillatory growth zoning indicative of crystallization from a fluid. Generally omphacite develops irregularly along jadeite rims, but recrystallization may lead to pairs with straight grain boundaries suggestive of phase equilibration. Comparison with published solvus relationships suggests temperatures of 425–500 °C. This unusual occurrence of different types of jadeite in a metabasic rock suggests two contrasting sources. The first – in the rock matrix, as topotactic alteration of igneous pyroxene and as plagioclase replacement epitactically growing on augite – can be explained as due to local domain equilibration in a rapidly subducted “spilitized” gabbroic rock. The second, in very thin fracture fillings, conforms to an origin as a crystallization product from a pervasive fluid. Conceivably, “pooling” of the fluids flowing through the fractures in larger cavities could lead to larger masses of jadeitite. These have not yet been conclusively documented in the Escambray Massif.

Print ISSN: 0935-1221

Electronic ISSN: 1617-4011

Topics: Geosciences