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Role of magma injection and mixing in the formation of chromitite in Archean anorthosites: Evidence from the Sittampundi Complex, southern India

文献类型：期刊论文

作者He, Hai-Long7; Wang, Yu-Quan1,7; Bao, Zhi-An6; George, P. M.6; Veni, S.5; Sajeev, K.5; Guo, Jing-Hui1,4,7; Zhai, Ming-Guo1,3,4,7; Lai, Chun-Kit2
刊名PRECAMBRIAN RESEARCH
出版日期2020-11-01
卷号350页码:17
关键词Neoarchean anorthosite Chromitite Sittampundi Complex Southern India Magma mixing
ISSN号0301-9268
DOI10.1016/j.precamres.2020.105914
英文摘要Chromitite occurs in many Archean anorthosite complexes. The Neoarchean Sittampundi Anorthosite Complex (SAC) in southern India is composed of mainly (amphibole-rich) anorthosite, minor gabbro, two pyroxene granulite, and many anorthosite-related chromitite layers and lenses. High-Mg-# orthopyroxene megacrysts are present in the chromitite but absent in the anorthosite. These megacrysts are disturbed and/or corroded by Cr-spinel and interstitial amphibole into fragment, but are still largely optically continuous. The absence of orthopyroxene in the anorthosite indicates that the mineral was formed in an earlier stage in the deep magma chamber(s), and then partially remelted when it was entered into the extant magma chamber. Two types of amphiboles are recognized based on textural and trace elemental features. Amphibole-1 in the chromitites is coarse-grained, and commonly surrounded by Cr-spinel and amphibole-2, which forms resorption texture along amphibole-1 rims. Chondrite-normalized REE patterns of the amphibole-1 in chromitite and that in anorthosite have similarly positive Eu* anomalies (1.53-3.04) and low total REE contents (Sigma REE = 2.90-4.42 ppm). This implies that amphibole-1 in the chromitite was captured from the anorthosite. Meanwhile, amphibole-2 is finegrained and occurs as interstitial infill among Cr-spinel, plagioclase, and amphibole-1. Amphibole-2 shows negative to weakly positive Eu anomalies (Eu/Eu* = 0.67-1.17), and slightly elevated total REE contents (Sigma FREE = 5.42-14.20 ppm). The resorption textures on orthopyroxene, amphibole-1, and plagioclase, and the close paragenetic relations between Cr-spinel and amphibole-2, suggest that Cr-spinel was saturated through the mixing of the anorthositic mush with a replenished, more primitive magma. The amphibole-2 REE patterns indicate that the injected magma had partially corroded the pre-existing plagioclase and amphibole-1, and mixed with the interstitial melt in the mush. Addition of Cr2O3 from the replenished magma and SiO2 from the anorthositic crystal mush had likely pushed the melt toward the Cr-spinel saturation and triggered chromitite formation. The high Al2O3 content of Cr-spinel is likely led by plagioclase remelting, which increased the Al3+ content in the mixed magma. Comparable Cr-spinel compositions of the Archean anorthosites worldwide suggest that their chromitites were possibly formed via similar magma injection and mixing processes.
WOS关键词CR-SPINEL SEAM ; ZIRCON U-PB ; ISUA GREENSTONE-BELT ; RUM LAYERED SUITE ; STILLWATER COMPLEX ; TAMIL-NADU ; CRUSTAL EVOLUTION ; WEST GREENLAND ; CUMULATE ASSIMILATION ; PODIFORM CHROMITITES
资助项目National Natural Science Foundation of China[41890834] ; National Natural Science Foundation of China[41902194] ; 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:000589423600026
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/132A11/99876]  
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 Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
2.Univ Brunei Darussalam, Fac Sci, BE-1410 Gadong, Brunei
3.Univ Chinese Acad Sci, Key Lab Computat Geodynam, Beijing 100049, Peoples R China
4.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
5.Indian Inst Sci, Ctr Earth Sci, Bengaluru 560012, India
6.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China
7.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, 19 Beitucheng West Rd, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 He, Hai-Long,Wang, Yu-Quan,Bao, Zhi-An,et al. Role of magma injection and mixing in the formation of chromitite in Archean anorthosites: Evidence from the Sittampundi Complex, southern India[J]. PRECAMBRIAN RESEARCH,2020,350:17.
APA He, Hai-Long.,Wang, Yu-Quan.,Bao, Zhi-An.,George, P. M..,Veni, S..,...&Lai, Chun-Kit.(2020).Role of magma injection and mixing in the formation of chromitite in Archean anorthosites: Evidence from the Sittampundi Complex, southern India.PRECAMBRIAN RESEARCH,350,17.
MLA He, Hai-Long,et al."Role of magma injection and mixing in the formation of chromitite in Archean anorthosites: Evidence from the Sittampundi Complex, southern India".PRECAMBRIAN RESEARCH 350(2020):17.

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来源：地质与地球物理研究所

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