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Nature of charnockite and Closepet granite in the Dharwar Craton: Implications for the architecture of the Archean crust

文献类型：期刊论文

作者Peng, Peng1,4,5; Qin, Zhaoyuan4,5; Sun, Fengbo4,5; Zhou, Xiaotong4,5; Guo, Jinghui1,4,5; Zhai, Mingguo1,4,5; Ernst, Richard E.2,3
刊名PRECAMBRIAN RESEARCH
出版日期2019-11-01
卷号334页码:15
关键词Archean Crustal architecture Dharwar Craton Charnockite Closepet granite Granulite terrane
ISSN号0301-9268
DOI10.1016/j.precamres.2019.105478
英文摘要The architecture of the Archean crust is crucial in understanding the geodynamics of cratonization. The Dharwar Craton in the Indian peninsula is well known for its continuous change of metamorphic grades from granulite facies in the south to amphibolite facies in the middle and greenschist facies in the north. Here the genetic relationship of different units is re-analyzed to decipher the crustal architecture of the craton. The major lithologic unit - the granitoids can be subdivided into TTG, charnockite, Closepet granite and anatectic granites/migmatites. The charnockite near Salem has two types of occurrence: one is massive, garnet-free and plutonic, crystallized at similar to 2560 Ma, and the other is gneissic, garnet-bearing and incipient, metamorphosed at similar to 2490 Ma. Both types are compositionally close to tonalite-granodiorite, and generally show positive Eu-anomalies. A large proportion of zircons of both types show positive epsilon Hf-t values (varying from -3 to + 9), indicating a relatively juvenile parent ( < 2800 Ma). The garnet-bearing charnockite was probably transformed in situ from the lower crust at granulite facies; whereas the garnet-free charnockite represents exotic magmas originated from the lower crust. The Closepet granite is potassium-rich and high in Mg#, and shows negative Eu-anomalies. It was emplaced at 2520-2510 Ma (simultaneous with the garnet-bearing charnockite), and the igneous zircons show negative epsilon Hf-t values ( - 9 to + 1). It likely originated from relatively ancient ( > 2900 Ma) crust at medium-pressure (in the middle crustal level) with significant mantle contribution. The genetic relationship of different units, the spatial age difference of greenstone belts and the spatial variation of metamorphic grade in the Dharwar craton suggest a trinity of Archean crustal architecture ('sandwich' structure), with 2700-2500 Madominated uppercrust, 3400-2900 Ma-dominated middle crust, and similar to 2560 to 2500 Ma anatectic lower crust. This 'sandwich' structure possibly indicates vertical growth of the crust in the Archean. The whole craton was tilted at similar to 2500 Ma with the southern end uplifted the most by an intra-cratonic process, and then it was shaped by later orogenic events resulting in the formation of the dominantly N-S trending structures in the basement.
WOS关键词EASTERN GHATS BELT ; SOUTHERN GRANULITE TERRANE ; KERALA KHONDALITE BELT ; U/PB ZIRCON AGES ; U-PB ; CONTINENTAL-CRUST ; SM-ND ; RB-SR ; INCIPIENT CHARNOCKITES ; SCHIST BELT
资助项目National Natural Science Foundation of China[41890833] ; National Natural Science Foundation of China[41772192] ; Key Research Project of CAS Frontier Research Project Scientific[QYZDB-SSW-DQC04281712250] ; Key Research Project of CAS Frontier Research Project Scientific[XDB18030205]
WOS研究方向Geology
语种英语
WOS记录号WOS:000496875000013
出版者ELSEVIER
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Project of CAS Frontier Research Project Scientific ; Key Research Project of CAS Frontier Research Project Scientific ; Key Research Project of CAS Frontier Research Project Scientific ; Key Research Project of CAS Frontier Research Project Scientific ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Project of CAS Frontier Research Project Scientific ; Key Research Project of CAS Frontier Research Project Scientific ; Key Research Project of CAS Frontier Research Project Scientific ; Key Research Project of CAS Frontier Research Project Scientific ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Project of CAS Frontier Research Project Scientific ; Key Research Project of CAS Frontier Research Project Scientific ; Key Research Project of CAS Frontier Research Project Scientific ; Key Research Project of CAS Frontier Research Project Scientific ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Project of CAS Frontier Research Project Scientific ; Key Research Project of CAS Frontier Research Project Scientific ; Key Research Project of CAS Frontier Research Project Scientific ; Key Research Project of CAS Frontier Research Project Scientific
源URL[http://ir.iggcas.ac.cn/handle/132A11/95720]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Peng, Peng
作者单位1.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
2.Tomsk State Univ, Fac Geol & Geog, Tomsk 634050, Russia
3.Carleton Univ, Dept Earth Sci, Ottawa, ON K1S 5B6, Canada
4.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
5.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Peng, Peng,Qin, Zhaoyuan,Sun, Fengbo,et al. Nature of charnockite and Closepet granite in the Dharwar Craton: Implications for the architecture of the Archean crust[J]. PRECAMBRIAN RESEARCH,2019,334:15.
APA Peng, Peng.,Qin, Zhaoyuan.,Sun, Fengbo.,Zhou, Xiaotong.,Guo, Jinghui.,...&Ernst, Richard E..(2019).Nature of charnockite and Closepet granite in the Dharwar Craton: Implications for the architecture of the Archean crust.PRECAMBRIAN RESEARCH,334,15.
MLA Peng, Peng,et al."Nature of charnockite and Closepet granite in the Dharwar Craton: Implications for the architecture of the Archean crust".PRECAMBRIAN RESEARCH 334(2019):15.

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来源：地质与地球物理研究所

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