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

查看全文 作　　者：Nilanjana [1]Sorcar;Kumar Batuk [1]Joshi;Elson [2]POliveira;[1]JKTomson;[1]VNandakumar

机构地区：[1]ESSO–National Centre For Earth Science Studies,Thiruvananthapuram,Kerala,India;[2]Department of Geology,Institute of Geosciences,University of Campinas,Brazil

出　　处：《Geoscience Frontiers》索引2020年第11卷第2期,共15页

基　　金：funding from the Department of Science and Technology, Government of India(India) under the DST INSPIRE Faculty Scheme (Grant:DST/INSPIRE/04/2014/000221) 摘　　要：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 here.The 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 metamorphism.Melt reintegration models suggest that up to 35%granitic melt could have been produced during metamorphism at^950C.The 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 terrain.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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Characterization of partial melting events in garnet-cordierite gneiss from the Kerala Khondalite Belt,India

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