A Late Cretaceous (ca. 90 Ma) kimberlite event in southern India: Implication for sub-continental lithospheric mantle evolution and diamond exploration

doi:10.1016/j.gr.2015.06.006

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	A Late Cretaceous (ca. 90 Ma) kimberlite event in southern India: Implication for sub-continental lithospheric mantle evolution and diamond exploration
	Rao, N. V. Chalapathi 1; Dongre, A.2; Wu, Fu-Yuan 3; Lehmann, B.4
刊名	GONDWANA RESEARCH
	2016-07-01
卷号	35 页码:378-389
关键词	Kimberlite Cretaceous Diamond Marion hot-spot Madagascar India
DOI	10.1016/j.gr.2015.06.006
文献子类	Article
英文摘要	We report groundmass perovskite U-Pb (SIMS) ages, perovskite Nd isotopic (LA-ICPMS) composition and bulk rock geochemical data of the Timmasamudram diamondiferous kimberlite cluster, Wajrakarur kimberlite field, in the Eastern Dharwar craton of southern India. The kimberlite pipes gave similar Mesoproterozoic ages of 1086 +/- 19 Ma (TK-1, microcrystic variant) and 1119 +/- 12 Ma (TK-3). However, a perovskite population sampled from the macrocrystic variant of TK-1 gave a much younger Late Cretaceous age of ca. 90 Ma. This macrocrystic kimberlite phase intrudes the Mesoproterozoic microcrystic phase and has a distinct bulk-rock geochemistry. The Nd-isotope composition of the similar to 1100 Ma perovskites in the cluster show depleted epsilon(Nd(T)) values of 2.1 +/- 0.6 to 6.7 +/- 0.3 whereas the similar to 90 Ma perovskites have enriched epsilon(Nd(T)) values of - 63 +/- 1.3. The depleted mantle (DM) model age of the Cretaceous perovskites is 12 Ga, whereas the DM model age of the Proterozoic perovskites is 1.2 to 1.5 Ga. Bulk-rock incompatible trace element ratios (La/Sm, Gd/Lu, La/Nb and Th/Nb) of all Timmasamudram kimberlites show strong affinity with those from the Cretaceous Group II kimberlites from the Bastar craton (India) and Kaapvaal craton (southern Africa). As the Late Cretaceous age of the younger perovskites from the TK-1 kimberlite is indistinguishable from that of the Marion hotspot-linked extrusive and intrusive igneous rocks from Madagascar and India, we infer that all may be part of a single Madagascar Large Igneous Province. Our finding constitutes the first report of Cretaceous kimberlite activity from southern India and has significant implications for its sub-continental lithospheric mantle evolution and diamond exploration programs. (C) 2015 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.
WOS关键词	PB AGE-DETERMINATION ; SITU U-PB ; STATIONARY MARION HOTSPOT ; LARGE IGNEOUS PROVINCES ; EASTERN DHARWAR CRATON ; ND ISOTOPIC ANALYSIS ; BREAK-UP ; FLOOD BASALTS ; MESOPROTEROZOIC KIMBERLITES ; PALEOMAGNETIC EVIDENCE
WOS研究方向	Geology
语种	英语
WOS记录号	WOS:000384702400025
资助机构	Department of Science and Technology, New Delhi(SR/FTP/ES-175/2010) ; Department of Science and Technology, New Delhi(SR/FTP/ES-175/2010) ; Alexander von Humboldt Foundation, Germany ; Alexander von Humboldt Foundation, Germany ; Department of Science and Technology, New Delhi(SR/FTP/ES-175/2010) ; Department of Science and Technology, New Delhi(SR/FTP/ES-175/2010) ; Alexander von Humboldt Foundation, Germany ; Alexander von Humboldt Foundation, Germany
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/53312]
专题	地质与地球物理研究所_岩石圈演化国家重点实验室
作者单位	1.Banaras Hindu Univ, Dept Geol, Ctr Adv Study, Varanasi 221005, Uttar Pradesh, India 2.Univ Johannesburg, Dept Geol, ZA-2006 Auckland Pk, South Africa 3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 4.Tech Univ Clausthal, Mineral Resources, D-38678 Clausthal Zellerfeld, Germany
推荐引用方式 GB/T 7714	Rao, N. V. Chalapathi,Dongre, A.,Wu, Fu-Yuan,et al. A Late Cretaceous (ca. 90 Ma) kimberlite event in southern India: Implication for sub-continental lithospheric mantle evolution and diamond exploration[J]. GONDWANA RESEARCH,2016,35:378-389.
APA	Rao, N. V. Chalapathi,Dongre, A.,Wu, Fu-Yuan,&Lehmann, B..(2016).A Late Cretaceous (ca. 90 Ma) kimberlite event in southern India: Implication for sub-continental lithospheric mantle evolution and diamond exploration.GONDWANA RESEARCH,35,378-389.
MLA	Rao, N. V. Chalapathi,et al."A Late Cretaceous (ca. 90 Ma) kimberlite event in southern India: Implication for sub-continental lithospheric mantle evolution and diamond exploration".GONDWANA RESEARCH 35(2016):378-389.