Re-Os isotope systematics of Archean chromitites from the Chimalpahad Anorthosite Complex, south-east India: Implications for mantle extraction processes

doi:10.1016/j.oregeorev.2014.09.033

	Re-Os isotope systematics of Archean chromitites from the Chimalpahad Anorthosite Complex, south-east India: Implications for mantle extraction processes
	Rao, C. V. Dharma 1; Santosh, M.2,3; Tang, Yan-Jie 4
刊名	ORE GEOLOGY REVIEWS
	2015-03-01
卷号	65 页码:274-282
关键词	Re-Os geochemistry Chromitites Anorthosites Heterogeneous mantle source Tectonics
ISSN号	0169-1368
DOI	10.1016/j.oregeorev.2014.09.033
文献子类	Article
英文摘要	The Chimalpahad Anorthosite Complex, which contains layers of chromitites, is located within the Archean Peninsular Gneissic Complex in the SE Indian shield. Here we present Re-Os isotope systematics of the chromitites and associated websterites and anorthosites in tracing the petrogenetic history and heterogeneity of the source mantle. The average initial Os-187/Os-188 compositions of chromitites are 0.1045 with negative gamma Os values of -17.67, whereas the websterites and anorthosites have average initial Os-187/Os-188 compositions of 14.86 and 11.79 with positive gamma Os values of +467 and + 215, respectively. Mantle extraction ages (T-MA) of the chromites indicate depletion of primitive mantle beginning as early as similar to 3.5 Ga. The subchondritic signature of Os in the chromitite is comparable with those of the chromites from ultramafic intrusions in the Zimbabwe Craton interpreted to reflect sequential extraction from evolving Archean subcontinental lithospheric mantle. The younger (T-MA) ages of 2.77-1.41 Ga of the websterites and anorthosites indicate Proterozoic melt depletion or complex isotopic systematics resulting from overprinting of tectonic events. The geochemical data and Re-Os isotope systematics presented in this study suggest that the Chimalpahad Complex formed from protracted evolution of ultramafic-mafic magmas in a deep-seated chamber of a magmatic arc along the SE margin of the Indian plate. (C) 2014 Elsevier B.V. All rights reserved.
WOS关键词	ZIRCON U-PB ; SUBCONTINENTAL LITHOSPHERIC MANTLE ; MESOPROTEROZOIC ARC MAGMATISM ; RB-SR ISOTOPE ; BUSHVELD COMPLEX ; GHATS BELT ; PERIDOTITE XENOLITHS ; ABYSSAL PERIDOTITES ; OPHIOLITIC MELANGE ; LAYERED INTRUSION
WOS研究方向	Geology ; Mineralogy ; Mining & Mineral Processing
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000348084400016
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/86896]
专题	中国科学院地质与地球物理研究所
通讯作者	Rao, C. V. Dharma
作者单位	1.Govt India, Minist Hlth & Family Welf, New Delhi, India 2.China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China 3.Kochi Univ, Dept Interdisciplinaiy Sci, Fac Sci, Akebono, Kochi 7808520, Japan 4.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Rao, C. V. Dharma,Santosh, M.,Tang, Yan-Jie. Re-Os isotope systematics of Archean chromitites from the Chimalpahad Anorthosite Complex, south-east India: Implications for mantle extraction processes[J]. ORE GEOLOGY REVIEWS,2015,65:274-282.
APA	Rao, C. V. Dharma,Santosh, M.,&Tang, Yan-Jie.(2015).Re-Os isotope systematics of Archean chromitites from the Chimalpahad Anorthosite Complex, south-east India: Implications for mantle extraction processes.ORE GEOLOGY REVIEWS,65,274-282.
MLA	Rao, C. V. Dharma,et al."Re-Os isotope systematics of Archean chromitites from the Chimalpahad Anorthosite Complex, south-east India: Implications for mantle extraction processes".ORE GEOLOGY REVIEWS 65(2015):274-282.