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Formation of similar to 2.5 Ga Sittampundi anorthosite complex in southern India: Implications to lower crustal stabilization of the Dharwar Craton

文献类型：期刊论文

作者He, Hai-Long3,4; Wang, Yu-Quan2,4; George, P. M.5; Sajeev, K.6; Guo, Jing-Hui2,4,7; Lai, Chun-Kit1; Zhai, Ming-Guo2,4,7,8
刊名PRECAMBRIAN RESEARCH
出版日期2021-03-01
卷号354页码:22
关键词Sittampundi anorthosite complex Dharwar Craton Magma underplating Lower crust Southern India Cratonization
ISSN号0301-9268
DOI10.1016/j.precamres.2020.106012
英文摘要Mantle-derived magmas at the base of the lower crust exerted a key control on late Archean cratonization in many continents. Since well-preserved, complete lower crustal section is rarely exposed, direct studies on the genetic link between mantle-derived magmas and cratonic lower crustal stabilization are inadequate. Cratonic lower crustal section is well-preserved in the southern margin of the Dharwar Craton (southern India), with a number of late Archean anorthositic-gabbroic complexes. Among these complexes, the Sittampundi anorthosite complex (SAC) consists of white- and dark-anorthosite (>60 vol%), gabbms, and ultramafic rocks. In this study, SIMS zircon U-Pb dating of the anorthosite revealed a minimum emplacement age of 2522 +/- 12 Ma, similar to the chromite Os model ages (2528-2563 Ma) of the anorthosite-hosted chromitite. In-situ plagioclase (Sr-87/Sr-86)(i) ratios (0.70079-0.70100) of the dark anorthosite and the chromite gamma(Os) (T) values (-0.2 to -0.4) of the chromitite suggest that the SAC was derived from a depleted mantle source. From the dark to white anorthosite, the (Sr-87/Sr-86); ratios increase while the An contents decrease, suggesting crustal assimilation occurred during fractionation. Similarly, the mantle-like zircon delta O-18 values and relatively-wide epsilon(Hf)(T) (-2.1 to +8.4) range of the SAC anorthosite suggest that the parental magma had assimilated the ancient mafic lower crust. Emplacement ages of the SAC and published ages of the mafic/felsic granulites and charnockites altogether indicate that the anorthosites were formed during the Dharwar cratonization, and that the mantle-derived magma underplating may have led to extensive lower crustal melting. We argued that during underplating, high-density olivine-pyroxene cumulates (from fractionation of the mantle-derived magma) and partial-melting residues (in the overlying lower crust) mostly sank back to the underlying mantle. In contrast, the lower-density plagioclase and minor amphibole remained in the lower crust to form anorthositic-gabbroic sills. The magmas underplating and subsequent lower-crustal melting have likely made the cratonic lower crust more refractory and buoyant, which facilitated cratonization.
资助项目National Natural Science Foundation of China[41902194] ; National Natural Science Foundation of China[41890834] ; National Natural Science Foundation of China[92062103] ; Chinese Academy of Sciences[XDB 18030205] ; Chinese Academy of Sciences[QYZDY-SSW-DQC017]
WOS研究方向Geology
语种英语
WOS记录号WOS:000615712000001
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 ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences
源URL[http://ir.iggcas.ac.cn/handle/132A11/100118]  
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Zhai, Ming-Guo
作者单位1.Univ Brunei Darussalam, Fac Sci, BE-1410 Gadong, Brunei
2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
3.Yunnan Univ, Sch Earth Sci, Kunming 650500, Yunnan, Peoples R China
4.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, 19 Beitucheng West Rd, Beijing 100029, Peoples R China
5.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China
6.Indian Inst Sci, Ctr Earth Sci, Bengaluru 560012, India
7.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
8.Univ Chinese Acad Sci, Key Lab Computat Geodynam, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 He, Hai-Long,Wang, Yu-Quan,George, P. M.,et al. Formation of similar to 2.5 Ga Sittampundi anorthosite complex in southern India: Implications to lower crustal stabilization of the Dharwar Craton[J]. PRECAMBRIAN RESEARCH,2021,354:22.
APA He, Hai-Long.,Wang, Yu-Quan.,George, P. M..,Sajeev, K..,Guo, Jing-Hui.,...&Zhai, Ming-Guo.(2021).Formation of similar to 2.5 Ga Sittampundi anorthosite complex in southern India: Implications to lower crustal stabilization of the Dharwar Craton.PRECAMBRIAN RESEARCH,354,22.
MLA He, Hai-Long,et al."Formation of similar to 2.5 Ga Sittampundi anorthosite complex in southern India: Implications to lower crustal stabilization of the Dharwar Craton".PRECAMBRIAN RESEARCH 354(2021):22.

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来源：地质与地球物理研究所

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