Origin of Permian gabbroic intrusions in the southern margin of the Altai Orogenic belt: A possible link to the Permian Tarim mantle plume?

doi:10.1016/j.lithos.2014.05.019

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	Origin of Permian gabbroic intrusions in the southern margin of the Altai Orogenic belt: A possible link to the Permian Tarim mantle plume?
	Zhang, Chuan-Lin 5; Zou, Hai-Bo ; Yao, Chun-Yan ; Dong, Yong-Guan
刊名	LITHOS
	2014
卷号	204 页码:112-124
关键词	Permian mafic-ultramafic intrusions The Altai orogenic belt Geochemistry Tectonic regime Ni-Cu sulfide mineralization
ISSN号	0024-4937
DOI	10.1016/j.lithos.2014.05.019
英文摘要	Zircon U-Pb dating and Hf isotopic compositions, whole-rock and mineral geochemistry, as well as field and petrographic observations, are reported for the Permian gabbroic intrusions in the southern margin of the Altai orogenic belt. Similar zircon ages (similar to 280 Ma) of these intrusions to that of the Permian Tarim mantle plume suggest a possible link to the Tarim plume. Olivine grains from the intrusions have Fo contents ranging from 69 to 81 and NiO from 0.05 to 0.21 wt.%, indicating the crystallization from evolved mafic magmas. Clinopyroxene grains from the intrusions have 0.3 to 1.5 wt.% TiO2 and display a rift- to arc-like affinity. The intrusions are tholeiitic and have slightly LREE-depleted to LREE-enriched chondrite-normalized rare earth element (REE) patterns. Zircons from the intrusions have epsilon(Hf)(t) values higher than + 8.0, whereas the whole-rock epsilon(Nd)(t) values range from + 2.7 to +7.0. Rocks from the intrusions have Nb/La of 0.2 to 0.8, consistent with the derivation from a depleted sub-lithospheric mantle with variable degrees of crustal contamination. The presence of primary hornblende and/or biotite in the rocks indicates metasomatism by slab-derived fluids/melts in the mantle source. We propose that upwelling of asthenospheric mantle in the Permian Tarim mantle plume along the Irtish suture zone, resulted in partial melting of the sub-continental lithospheric mantle. Based on a comparison between the Ni-Cu sulfide-bearing Kalatongke complex and un-mineralized intrusions, we suggest that Ni-Cu sulfide mineralized intrusions in the Altai orogenic belt are characterized by the enrichments of LREEs and LILEs and by the presence of primary water-bearing minerals. (C) 2014 Elsevier B.V. All rights reserved.
学科主题	火成岩岩石学
WOS关键词	LARGE IGNEOUS PROVINCE ; NW CHINA IMPLICATIONS ; MAFIC-ULTRAMAFIC INTRUSIONS ; PALEOZOIC TECTONIC EVOLUTION ; NI SULFIDE DEPOSITS ; A-TYPE GRANITES ; SLAB BREAK-OFF ; ZIRCON U-PB ; NORTHWEST CHINA ; FLOOD BASALTS
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000342260400011
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40321]
专题	中国地质调查局南京地质调查中心
作者单位	1.[Zhang, Chuan-Lin 2.Yao, Chun-Yan 3.Nanjing Inst Geol & Mineral Resources, Nanjing 210016, Peoples R China 4.Auburn Univ, Dept Geol & Geog, Auburn, AL 36849 USA 5.中国地质调查局南京地质调查中心
推荐引用方式 GB/T 7714	Zhang, Chuan-Lin,Zou, Hai-Bo,Yao, Chun-Yan,et al. Origin of Permian gabbroic intrusions in the southern margin of the Altai Orogenic belt: A possible link to the Permian Tarim mantle plume?[J]. LITHOS,2014,204:112-124.
APA	Zhang, Chuan-Lin,Zou, Hai-Bo,Yao, Chun-Yan,&Dong, Yong-Guan.(2014).Origin of Permian gabbroic intrusions in the southern margin of the Altai Orogenic belt: A possible link to the Permian Tarim mantle plume?.LITHOS,204,112-124.
MLA	Zhang, Chuan-Lin,et al."Origin of Permian gabbroic intrusions in the southern margin of the Altai Orogenic belt: A possible link to the Permian Tarim mantle plume?".LITHOS 204(2014):112-124.