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Hydro-uvarovite from Mantle Peridotites of Naga Hills Ophiolite: A Mineral Tracer for Neo-Tethyan Mantle Wedge Metasomatism

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Acta Geologica Sinica(English Edition) 2024年第4期98卷 867-877页

作者： Anisha VERENCAR Abhishek SAHA nilanjana sorcar Sohini GANGULY Pankaj KUMAR Atul Kumar SINGH CSIR-National Institute of Oceanography Dona PaulaGoa 403004India School of Earth Ocean and Atmospheric SciencesGoa UniversityTaleigao PlateauGoa 403206India National Centre for Earth Science Studies ThiruvananthapuramKeralaIndia Inter University Accelerator Centre(IUAC) New Delhi 110067India North-Eastern Hill University ShillongMeghalaya 793022India

Hydrous Cr-bearing uvarovite garnets are rare in natural occurrences and belong to the ugrandite series and exist in binary solid solutions with grossular and andradite garnets. Here, we report the occurrence of hydrous uvarovite garnet having Cr_(2)O_(3) upto 19.66 wt% and CaO of 32.12–35.14 wt% in the serpentinized mantle peridotites of Naga Hills Ophiolite(NHO), India. They occur in association with low-Cr diopsides. They are enriched in LILE(Ba, Sr), LREEs, with fractionating LREE-MREE [avg.(La/Sm)_(N) = 2.16] with flat MREE/HREE patterns [avg.(Sm/Yb)_(N) = 0.95]. Raman spectra indicate the presence of hydroxyl(OH^(–)) peaks from 3500 to 3700 cm^(-1). Relative abundances in fluid mobile elements and their close association with clinopyroxenes are suggestive of the formation of uvarovite garnets through low temperature metasomatic alteration of low-Cr diopsides by hydrothermal slab fluids. The high LREE concentration and absence of Eu anomaly in the garnet further attest to alkaline nature of the transporting slab dehydrated fluid rather the involvement of low-p H solution. The chemical characteristics of the hydroxyl bearing uvarovite hosted by the mantle peridotite of NHO deviate from the classical features of uvarovite garnet, and their origin is attributed to the fluid-induced metasomatism of the sub arc mantle wedge in a suprasubduction zone regime.

关键词： uvarovite hydroxyl metasomatic alteration low-Cr diopsides serpentinization mantle peridotite

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Characterization of partial melting events in garnet-cordierite gneiss from the Kerala Khondalite Belt,India

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Geoscience Frontiers 2020年第2期11卷 597-611页

作者： nilanjana sorcar Kumar Batuk Joshi Elson POliveira JKTomson VNandakumar ESSO–National Centre For Earth Science Studies ThiruvananthapuramKeralaIndia Department of Geology Institute of GeosciencesUniversity of CampinasBrazil

Phase equilibria modelling coupled with U–Pb zircon and monazite ages of garnet–cordierite gneiss from Vallikodu Kottayam in the Kerala Khondalite Belt,southern India are presented *** results suggest that the area attained peak P–T conditions of^900C at 7.5–8 kbar,followed by decompression to 3.5–5 kbar and cooling to 450–480C,preserving signatures of the partial melting event in the field of high to ultra-high temperature *** reintegration models suggest that up to 35%granitic melt could have been produced during metamorphism at^950*** U–Pb age data from zircons(~1.0–~0.7 Ga)and chemical ages from monazites(~540 Ma and^941 Ma)reflect a complex tectonometamorphic evolution of the ***^941 Ma age reported from these monazites indicate a Tonian ultra-high temperature event,linked to juvenile magmatism/deformation episodes reported from the Southern Granulite Terrane and associated fragments in Rodinia,which were subsequently overprinted by the Cambrian(~540 Ma)tectonothermal episode.

关键词： Kerala khondalite belt(KKB) Garnet-cordierite gneiss Partial melting Pseudosection Monazite-zircon geochronology

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Corrigendum to“Characterization of partial melting events in garnet-cordierite gneiss from the Kerala Khondalite Belt,India”[***.11(2020),597-611]

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Geoscience Frontiers 2021年第2期12卷 693-694页

作者： nilanjana sorcar Kumar Batuk Joshi Elson P. Oliveira J.K. Tomson V. Nandakumar ESSO–National Centre For Earth Science Studies Thiruvananthapuram Kerala India Department of Geology Institute of Geosciences University of Campinas Brazil

The sample location in our paper(sorcar et al.,2020)was incorrectly marked in Fig.1,although the GPS location was reported *** corrected sample location of garnet-cordierite gneiss is shown in *** sample location falls within the Achankovil Shear Zone(ASZ)and not in the Trivandrum Block as stated in our ***,the Tonian ultrahigh-temperature(UHT)metamorphic event reported in our paper is applicable to ASZ,and not for the Trivandrum *** related discussion on Gondwana correlation in our paper may be viewed and read in that context.

关键词： garnet gneiss metamorphic

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