Mesoproterozoic U-Pb ages, trace element and Sr-Nd isotopic composition of perovskite from kimberlites of the Eastern Dharwar craton, southern India: Distinct mantle sources and a widespread 1.1 Ga tectonomagmatic event
文献类型：期刊论文
| 作者 | Rao, N. V. Chalapathi1; Wu, Fu-Yuan2; Mitchell, R. H.3; Li, Qiu-Li2; Lehmann, B.4 |
| 刊名 | CHEMICAL GEOLOGY
 |
| 出版日期 | 2013-08-30 |
| 卷号 | 353页码:48-64 |
| 关键词 | U-pb Ages Sr-nd Isotopes Perovskite Kimberlite Eastern Dharwar Craton India |
| ISSN号 | 0009-2541 |
| DOI | 10.1016/j.chemgeo.2012.04.023 |
| 文献子类 | Article |
| 英文摘要 | We report new U-Pb ages of groundmass perovskite determined by secondary ion mass spectrometry, trace element, and Sr and Nd isotopic compositions for twelve kimberlites emplaced in three different fields from the Eastern Dharwar craton, southern India. Diamondiferous kimberlites from the Wajrakarur field gave ages ranging from 1099 +/- 12 Ma to 1129 +/- 12 Ma. The non-diamondiferous kimberlites from the Narayanpet field gave ages ranging from 1123 +/- 17 Ma to 1141 +/- 18 Ma. One kimberlite (Siddanpalle cluster) from the poorly-diamondiferous Raichur field has an indistinguishable age of 1093 +/- 18 Ma. Our data contribute to the evidence for a near-synchronous late Mesoproterozoic kimberlite emplacement event in the Eastern Dharwar craton at 1.1 Ga and increases the spatial extent of this tectonomagmatic event. The perovskite U-Pb ages of kimberlites determined in this study are similar to those of the diamondiferous Majhgawan and Bunder lamproites of the Bundelkhand craton (northern India) and Nuapada lamproites of Bastar craton, (central India), but are clearly much younger than the 1.5 Ga ages recently reported for some of the Krishna lamproites of the Eastern Dharwar Craton. Regardless of their contemporaneous ages, initial Sr-87/Sr-86 ratios of Narayanpet perovskites are notably higher (0.70302-0.70339) than those (0.70240-0.70255) from the Wajrakarur Field. Similarly, the epsilon(Nd)(t) of Narayanpet perovskite (+0.6 to +1.9) is relatively lower than that (+2 to +2.9) of the Wajrakarur perovskites and provides clear evidence for the involvement of distinct isotopic mantle sources for these different kimberlite fields. The Raichur kimberlite has an indistinguishable initial Sr-87/Sr-86 ratio (0.70305) and epsilon(Nd)(t) (+1.4) to the Narayanpet kimberlites. The perovskite depleted mantle model ages (T-DM) of the Wajrakarur and Narayanpet kimberlites range from 1.3 to 1.5 Ga and are inferred to be distant effects related to the break-up of the Columbia supercontinent and separation of the North China craton and Indian shield from the Laurentia continent. A variably-enriched metasomatised sub-continental lithospheric mantle overprinted by an asthenospheric signature within a short time-span can account for the distinct isotopic signals of kimberlites in different fields of the Eastern Dharwar Craton and their "transitional" petrological and geochemical characteristics compared to archetypal kimberlites. (c) 2012 Elsevier B.V. All rights reserved. |
| WOS关键词 | IONIZATION MASS-SPECTROMETRY ; WHOLE-ROCK GEOCHEMISTRY ; LARGE IGNEOUS PROVINCE ; LA-MC-ICPMS ; K-AR AGES ; ANDHRA-PRADESH ; RB-SR ; CUDDAPAH BASIN ; ANANTAPUR DISTRICT ; KOTAKONDA KIMBERLITE |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000324469400005 |
| 出版者 | ELSEVIER SCIENCE BV |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/86494]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Rao, N. V. Chalapathi |
| 作者单位 | 1.Banaras Hindu Univ, Ctr Adv Study Geol, Varanasi 221005, Uttar Pradesh, India 2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 3.Lakehead Univ, Dept Geol, Thunder Bay, ON P7B 5E1, Canada 4.Tech Univ Clausthal, D-38678 Clausthal Zellerfeld, Germany |
| 推荐引用方式 GB/T 7714 | Rao, N. V. Chalapathi,Wu, Fu-Yuan,Mitchell, R. H.,et al. Mesoproterozoic U-Pb ages, trace element and Sr-Nd isotopic composition of perovskite from kimberlites of the Eastern Dharwar craton, southern India: Distinct mantle sources and a widespread 1.1 Ga tectonomagmatic event[J]. CHEMICAL GEOLOGY,2013,353:48-64. |
| APA | Rao, N. V. Chalapathi,Wu, Fu-Yuan,Mitchell, R. H.,Li, Qiu-Li,&Lehmann, B..(2013).Mesoproterozoic U-Pb ages, trace element and Sr-Nd isotopic composition of perovskite from kimberlites of the Eastern Dharwar craton, southern India: Distinct mantle sources and a widespread 1.1 Ga tectonomagmatic event.CHEMICAL GEOLOGY,353,48-64. |
| MLA | Rao, N. V. Chalapathi,et al."Mesoproterozoic U-Pb ages, trace element and Sr-Nd isotopic composition of perovskite from kimberlites of the Eastern Dharwar craton, southern India: Distinct mantle sources and a widespread 1.1 Ga tectonomagmatic event".CHEMICAL GEOLOGY 353(2013):48-64. |
入库方式： OAI收割
来源：地质与地球物理研究所
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