High Ba-Sr adakitic charnockite suite from the Nagercoil Block,southern India:Vestiges of Paleoproterozoic arc and implications for Columbia to Gondwana

作     者：Pin Gao M.Santosh Cheng-Xue Yang Sanghoon Kwon Mu.Ramkumar Pin Gao;M.Santosh;Cheng-Xue Yang;Sanghoon Kwon;Mu.Ramkumar

作者机构：School of Earth Sciences and ResourcesChina University of Geosciences(Beijing)29 Xueyuan RoadBeijing 100083PR China Department of Earth SciencesUniversity of AdelaideAdelaideSA 5005Australia Department of Earth SciencesYonsei UniversitySeoul 03772Republic of Korea Department of GeologyPeriyar UniversitySalem 636011India 

出 版 物：《Geoscience Frontiers》 (地学前缘（英文版）)

年 卷 期：2021年第12卷第3期

页      面：577-596页

核心收录：

学科分类：070903[理学-古生物学与地层学(含：古人类学)] 0709[理学-地质学] 070901[理学-矿物学、岩石学、矿床学] 07[理学] 

基　　金：funded by Foreign Expert grants to M.Santosh from the China University of Geosciences Beijing,China partially supported by NRF 2017R1A6A1A07015374 and NRF 2019R1A2C1002211supervised by the Ministry of Science and ICT,Korea to Sanghoon Kwon funded the Fundamental Research Fund of Central Universities(Grant 2652019210)through CUGB,China 

主　　题：Charnockite Adakitic rocks High Ba-Sr granitoids Geochemistry and zircon geochronology Nagercoil block Columbia and Gondwana supercontinents 

摘      要：The Nagercoil block is the southernmost crustal segment of the Southern Granulite Terrane(SGT)in India and is mainly composed of charnockitic rocks and felsic gneisses(charnockite suite).In this study,we present petrologic,geochemical,zircon U-Pb,REE,and Hf isotopic studies on the charnockites and leucogneiss from the Nagercoil *** on field investigations and petrologic studies,the charnockites can be divided into garnet-bearing and garnet-absent anhydrous granulite facies rocks with *** charnockites and leucogneiss show transition from adakites to non-adakitic magmatic rocks,with enrichment in LREEs(light rare earth elements)and LILEs(large ion lithophile elements),and depletion in HREEs(heavy rare earth elements)and HFSEs(high field strength elements).Some of the charnockites and the leucogneiss show typical HSA(high silica adakite)characters,(high SiO_(2),Al_(2)O_(3),Ba-Sr,La/Yb,and Sr/Y).The HSA is considered to have formed from the interaction of slab derived melts and peridotitic mantle *** high Ba-Sr features were possibly inherited from subducted oceanic crust melting under high thermal gradient during *** magmas were underplated and subjected to fractional *** grains from the charnockite and leucogneiss show zoned magmatic cores surrounded by structureless metamorphic *** zircon grains from the charnockites show ages ranging from 1983±8.8 Ma to 2046±14 Ma,and the metamorphic domains show an age range of 502±14 Ma to 547±8.7 *** from the leucogneiss yielded magmatic and metamorphic ages of 1860±20 Ma and 575.6±8.8 *** charnockites and leucogneiss show two prominent age peaks at 1987 Ma and 568 *** REE data of the zircon grains show LREE depletion and HREE enrichment,with the metamorphic grains showing more depletion in *** Hf isotopic data of the magmatic cores of zircon grains from the charnockite yieldedε_(Hf)(t)values from-1.17 to 0.46 with T_(DM)and T_(DM)~C and age