Tectonic juxtaposition of crust and continental growth during orogenesis: Example from the Rengali Province, eastern India

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英文篇名：Tectonic juxtaposition of crust and continental growth during orogenesis: Example from the Rengali Province, eastern India 作者：Sankar ; Bose ; Susmita ; Guha ; Gautam ; Ghosh ; Kaushik ; Das ; Joydip ; Mukhopadhyay 英文作者：Sankar Bose;Susmita Guha;Gautam Ghosh;Kaushik Das;Joydip Mukhopadhyay;Department of Geology, Presidency University;Department of Earth and Planetary Systems Science, Hiroshima University;PPM Research Group, Department of Geology, University of Johannesburg; 英文关键词：Singhbhum craton;;Rengali Province;;Granulite enclave;;Tectonic juxtaposition 中文刊名：GSFT 英文刊名：地学前缘(英文版) 机构：Department of Geology, Presidency University;Department of Earth and Planetary Systems Science, Hiroshima University;PPM Research Group, Department of Geology, University of Johannesburg; 出版日期：2015-07-15 出版单位：Geoscience Frontiers 年：2015 期：v.6 基金：financial support from CSIR;; India through a major research scheme(No.24(0312)/10/EMR-II);; UGC-CAS facility and the DSTFIST facility of the Department of Geology,Presidency University 语种：英文; 页：GSFT201504006 页数：19 CN：04 ISSN：11-5920/P 分类号：65-83

摘要

The southern boundary of the Singhbhum Craton witnessed multiple orogenies that juxtaposed thin slice of granulite suite of the Rengali Province against the low-grade granite-greenstone belt of the craton along the EeW trending Sukinda Thrust.The strong southerly dipping mylonitic foliation within the granulites along with the prominent down-dip mineral lineation,suggest a northerly-verging thrusting.Mylonitized charnockite at the contact zone contains enclaves of mafic and ultramafic granulite,whereas granitoid gneiss contains enclaves of pelitic granulite.Mafic granulite enclaves preserve an early(S1M)foliation that formed during D1Mdeformation.This rock,along with the host charnockite,were intensely deformed by the D2Mthrusting event and resulting S2Mfoliation development in both rock suites.Geothermobarometric and pseudosection analyses show that the garnet-clinopyroxene-plagioclaseorthopyroxene-ilmenite-quartz assemblage in mafic granulite was stabilized at high-pressure and temperature conditions(10 12 kbar,860 C)and was overprinted by a fine-grained assemblage of clinopyroxene-plagioclase hornblende that developed during decompression(down to 5.5e7.5 kbar).Matrix hornblende shows incipient breakdown to garnet-clinopyroxene-quartz intergrowth due to a granulite facies reworking.A contrasting P-T history is preserved in the pelitic granulite.The peak assemblage garnet-orthopyroxene-cordierite-quartz-rutile was stabilized at w6.0 kbar,730 C which resulted from heating of the mid crust magma during the D2Mthrusting.The contrasting P-T histories could result from the tectonic juxtaposition of lower-and mid-crustal section during the D2Mevent.Evidences of an early orogenic imprint within the mafic granulite imply involvement of deep continental crust during southward growth of the Singhbhum Craton.
        The southern boundary of the Singhbhum Craton witnessed multiple orogenies that juxtaposed thin slice of granulite suite of the Rengali Province against the low-grade granite-greenstone belt of the craton along the EeW trending Sukinda Thrust. The strong southerly dipping mylonitic foliation within the granulites along with the prominent down-dip mineral lineation, suggest a northerly-verging thrusting.Mylonitized charnockite at the contact zone contains enclaves of mafic and ultramafic granulite, whereas granitoid gneiss contains enclaves of pelitic granulite. Mafic granulite enclaves preserve an early(S1M)foliation that formed during D1 Mdeformation. This rock, along with the host charnockite, were intensely deformed by the D2 Mthrusting event and resulting S2 Mfoliation development in both rock suites.Geothermobarometric and pseudosection analyses show that the garnet-clinopyroxene-plagioclaseorthopyroxene-ilmenite-quartz assemblage in mafic granulite was stabilized at high-pressure and temperature conditions(10 12 kbar, 860 C) and was overprinted by a fine-grained assemblage of clinopyroxene-plagioclase hornblende that developed during decompression(down to 5.5e7.5 kbar).Matrix hornblende shows incipient breakdown to garnet-clinopyroxene-quartz intergrowth due to a granulite facies reworking. A contrasting P-T history is preserved in the pelitic granulite. The peak assemblage garnet-orthopyroxene-cordierite-quartz-rutile was stabilized at w6.0 kbar, 730 C which resulted from heating of the mid crust magma during the D2 Mthrusting. The contrasting P-T histories could result from the tectonic juxtaposition of lower- and mid-crustal section during the D2 Mevent.Evidences of an early orogenic imprint within the mafic granulite imply involvement of deep continental crust during southward growth of the Singhbhum Craton.

引文

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    showing intergrown quartz(Qtz).(c)BSE image showing vermicular intergrowth of garnet and quartz(Grt t Qtz)as overgrowth on porphyroblastic garnet(Grt)grain in pelitic granulite sample RNG 61B.Note the presence of monazite(Mnz)grain within the intergrowth.(d)Randomly oriented sillimanite(Sil)and biotite(Bt)grains within garnet(Grt)porphyroblasts in pelitic granulite sample RNG 61B.(e)Photomicrograph showing thin film of alkali feldspar(Kfs)developing between quartz(Qtz)and plagioclase(Pl)grains in the leucosome layer of sample RNG 61B.Also note the presence of biotite(Bt)selvage surrounding the leucosome.(f)Photomicrograph showing coarse garnet(Grt)and cordierite(Crd)forming granoblastic assemblage.A foliation is present in the matric which is composed of biotite t sillimanite(Bt t Sil).(g)BSE image of orthopyroxene megacryst in ultramafic granulite sample JK 35 showing exsolved plagioclase(Pl)along prominent crystallographic orientation.The plagioclase collar separates the megacryst from the matrix.(h)Megacrystic orthopyroxene(Opx)surrounded by finer recrystallized aggregate of clinopyroxene t orthopyroxene hornblende(Cpx t Opx Hbl)in the same ultramafic granulite.Note the presence of plagioclase(Pl)surrounding the megacryst.