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Zircon-monazite geochronology and P-T evolution of the Sargur Greenstone Belt: Implications for the end-Archean tectonics of the Dharwar Craton in southern India

文献类型：期刊论文

作者Zhao, Yan2; Zhai, Mingguo1,2,3; Zhang, Chengli2; Sun, Yong2; Gou, Longlong2; Lu, Junsheng2; Sajeev, K.4; George, P. M.2; Ao, Wenhao2; Hu, Yuhua2
刊名PRECAMBRIAN RESEARCH
出版日期2021-09-15
卷号364页码:23
ISSN号0301-9268
关键词Western Dharwar craton Sargur Greenstone belt End-Archean Amphibolite-facies metamorphism Collisional tectonic setting
DOI10.1016/j.precamres.2021.106384
英文摘要We report petrological and geochronological data for metamafic volcanics and metasediments from the Sargur Greenstone Belt, Western Dharwar Craton (WDC), southern India and discuss the end-Archean metamorphic P-T conditions of the Sargur Greenstone Belt, as well as geotectonic implications of the end-Archean metamorphism in the WDC. The LA-ICP MS zircon U-Pb dating yields a metamorphic age of 2500 +/- 20 Ma for the garnet-bearing amphibolite. The garnet-staurolite-kyanite mica schist sample has metamorphic zircon and monazite U-Pb ages of 2443 +/- 7 Ma and 2468 +/- 10 Ma, respectively, consistent with metamorphic zircon U-Pb ages of 2459 +/- 17 Ma and 2455 +/- 18 Ma yield by the amphibole-garnet schist samples. The peak mineral assemblage of the garnetbearing amphibolite is garnet + clinopyroxene + amphibole + plagioclase + quartz + rutile + ilmenite, and that of the metapelitic schist is garnet + staurolite + kyanite + biotite + muscovite + quartz + plagioclase. Phase equilibrium modelling, together with geothermobarometers yield P-T conditions of 7.9-8.9 kbar/681-769.C and 7.5-9.3 kbar/683-694 degrees C for the garnet-bearing amphibolite and garnet-staurolite-kyanite mica schist, respectively, corresponding to a medium geothermal gradient of 20-25 degrees C/km. These data indicate that the Sargur Greenstone Belt has experienced a typical Barrovian-type (amphibolite-facies) metamorphism at ca. 2.50-2.44 Ga. Combined with the previous studies, it is suggested that the Sargur Greenstone Belt was most likely to be formed during 3.35-3.12 Ga and was reworked through four episodes of magmatic-metamorphic events occurred at ca. 3.1 Ga, ca. 3.0 Ga, ca. 2.8-2.6 Ga and ca. 2.5-2.4 Ga. The prominent ca. 2.5-2.4 Ga regional metamorphism is the last stage of the Neoarchean tectono-thermal event in the WDC and thus most possibly indicate accretion-collision of different Archean blocks at ca. 2.5-2.4 Ga and lead to the final cratonization (stabilization) of the whole Dharwar Craton.
WOS关键词NORTH CHINA CRATON ; MINERAL EQUILIBRIA CALCULATIONS ; CHITRADURGA SCHIST BELT ; HIGH-GRADE METAMORPHISM ; U-PB ; CONTINENTAL GROWTH ; SUPRACRUSTAL ROCKS ; CRUSTAL EVOLUTION ; DETRITAL ZIRCON ; PALEOPROTEROZOIC TRANSITION
资助项目National Natural Science Foundations of China[41890831] ; National Natural Science Foundations of China[41802199] ; Natural Science Foundation of Shaanxi[2020JQ-587] ; State Key Laboratory of Continental Dynamics, Northwest University
WOS研究方向Geology
语种英语
出版者ELSEVIER
WOS记录号WOS:000695141600016
资助机构National Natural Science Foundations of China ; National Natural Science Foundations of China ; Natural Science Foundation of Shaanxi ; Natural Science Foundation of Shaanxi ; State Key Laboratory of Continental Dynamics, Northwest University ; State Key Laboratory of Continental Dynamics, Northwest University ; National Natural Science Foundations of China ; National Natural Science Foundations of China ; Natural Science Foundation of Shaanxi ; Natural Science Foundation of Shaanxi ; State Key Laboratory of Continental Dynamics, Northwest University ; State Key Laboratory of Continental Dynamics, Northwest University ; National Natural Science Foundations of China ; National Natural Science Foundations of China ; Natural Science Foundation of Shaanxi ; Natural Science Foundation of Shaanxi ; State Key Laboratory of Continental Dynamics, Northwest University ; State Key Laboratory of Continental Dynamics, Northwest University ; National Natural Science Foundations of China ; National Natural Science Foundations of China ; Natural Science Foundation of Shaanxi ; Natural Science Foundation of Shaanxi ; State Key Laboratory of Continental Dynamics, Northwest University ; State Key Laboratory of Continental Dynamics, Northwest University
源URL[http://ir.iggcas.ac.cn/handle/132A11/102663]  
专题地质与地球物理研究所_中国科学院矿产资源研究重点实验室
通讯作者Zhao, Yan
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
2.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China
3.Univ Chinese Acad Sci, Key Lab Computat Geodynam, Beijing 100049, Peoples R China
4.Indian Inst Sci, Ctr Earth Sci, Bengaluru 560012, India
推荐引用方式
GB/T 7714		 Zhao, Yan,Zhai, Mingguo,Zhang, Chengli,et al. Zircon-monazite geochronology and P-T evolution of the Sargur Greenstone Belt: Implications for the end-Archean tectonics of the Dharwar Craton in southern India[J]. PRECAMBRIAN RESEARCH,2021,364:23.
APA Zhao, Yan.,Zhai, Mingguo.,Zhang, Chengli.,Sun, Yong.,Gou, Longlong.,...&Xu, Xiaofei.(2021).Zircon-monazite geochronology and P-T evolution of the Sargur Greenstone Belt: Implications for the end-Archean tectonics of the Dharwar Craton in southern India.PRECAMBRIAN RESEARCH,364,23.
MLA Zhao, Yan,et al."Zircon-monazite geochronology and P-T evolution of the Sargur Greenstone Belt: Implications for the end-Archean tectonics of the Dharwar Craton in southern India".PRECAMBRIAN RESEARCH 364(2021):23.

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来源：地质与地球物理研究所

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