气候变化领域集成服务门户(CCPortal): Discovery of Alaskan-style Tuerkubantao maficultramafic complex in NW-Junggar, NW China, and its significance

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	Discovery of Alaskan-style Tuerkubantao maficultramafic complex in NW-Junggar, NW China, and its significance
	Qin KeZhang; Guo ZhengLin; Tang DongMei; Li JinXiang; Guo XuJi; Dong LianHui
通讯作者	Qin, KZ (通讯作者)
发表日期	2018
ISSN	1000-0569
EISSN	2095-8927
起始页码	1897
结束页码	1913
卷号	34 期号:7
英文摘要	Northwestern margin of Junggar is located at the convergence of southwestern of Altai metallogenic belt and north of West Junggar, and in the binding district between Siberian plate and the Junggar plate, and is an important tectonic-magmatic-metallogenic province in northern Xinjiang. The Devonian Tuerkubantao mafic-ultramafic complex of Alaskan type was discovered in the Sawuer arc belt for the first time, accompanying by copper-nickel mineralization, which has significance on the prospecting of the regional and circum-Junggar arc belt. Tuerkubantao complex has the ring-shape characteristics, peridotite, gabbro, and hornblende gabbro occurs from inner to outer. Gabbro yields a zircon U-Pb concordia age of 394. 6 +/- 4. 9Ma, forming in the Early Devonian. Major and trace element characteristics indicate that the mafic-ultramafic complex was the product of differentiation of the same primary magma from the mantle source. High MgO and Cr abundance, Sr-Nd and Hf isotopic characteristics suggest that the magma source may be slightly depleted mantle, contaminated by the addition of subducted oceanic crust and by a small amount of crustal material in the process of ascend from mantle to upper crust. The rocks are characterized by enrichments in large-ion lithophile elements ( LILE: Rb, Ba, Sr) , more mobile highly incompatible lithophile elements (HILE) (U, Th) and relatively depletion in high field strength elements (HFSE : Nb, Ta, Zr, Hf, Ti, P) suggesting that the primary magma of Tuerkubantao mafic-ultramafic complex is arc magma in nature. However, it is significantly different from Xiangshan, Huangshan and Tulaergen magmatic Cu-Ni deposit in the eastern Tianshan, and Kalatongke in the eastern section of Irtysh metallogenic belt forming at the Early Permian post-orogenic extension setting, but is similar to Duke Island Complex hosting Cu-Ni mineralization in the southeastern Alaska. Based on these features, we confirm Tuerkubantao complex is the Alaskan-type formed in the arc setting. In addition, the inference supports previous view that the subduction of Junggar oceanic crust has been existed in the Sawuer region in the Early Devonian. This study has great significance for the regional Cu-Ni-PGE prospecting.
关键词	MAFIC-ULTRAMAFIC INTRUSION U-PB GEOCHRONOLOGY ASIAN OROGENIC BELT CU SULFIDE DEPOSIT SR-ND ISOTOPES WEST JUNGGAR GEOCHEMICAL CHARACTERISTICS TECTONIC EVOLUTION NORTHERN XINJIANG QINGHAI PROVINCE
英文关键词	Tuerkubantao complex; Petrofacies; Zircon U-Pb age; Alaskan-style; Sawuer arc; West Junggar; Cu-Ni-PGE mineralization
语种	英语
WOS研究方向	Geology
WOS类目	Geology
WOS记录号	WOS:000451724300005
来源期刊	ACTA PETROLOGICA SINICA
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259253
推荐引用方式 GB/T 7714	Qin KeZhang,Guo ZhengLin,Tang DongMei,et al. Discovery of Alaskan-style Tuerkubantao maficultramafic complex in NW-Junggar, NW China, and its significance[J]. 中国科学院青藏高原研究所,2018,34(7).
APA	Qin KeZhang,Guo ZhengLin,Tang DongMei,Li JinXiang,Guo XuJi,&Dong LianHui.(2018).Discovery of Alaskan-style Tuerkubantao maficultramafic complex in NW-Junggar, NW China, and its significance.ACTA PETROLOGICA SINICA,34(7).
MLA	Qin KeZhang,et al."Discovery of Alaskan-style Tuerkubantao maficultramafic complex in NW-Junggar, NW China, and its significance".ACTA PETROLOGICA SINICA 34.7(2018).