Compositional characteristics of pyroxenes from Permian mafic-ultramafic complexes in Eastern Xinjiang, and their implications for petrogenesis and Ni-Cu mineralization

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 中国科学院矿产资源研究重点实验室

	Compositional characteristics of pyroxenes from Permian mafic-ultramafic complexes in Eastern Xinjiang, and their implications for petrogenesis and Ni-Cu mineralization
	Xue ShengChao 1,2; Qin KeZhang 1; Tang DongMei 1; Mao YaJing 1; Yao ZhuoSen 1,2
刊名	ACTA PETROLOGICA SINICA
	2015-08-01
卷号	31 期号:8 页码:2175-2192
关键词	Mafic-ultramafic complexes Orthopyroxene Clinopyroxene Parental magma Ni-Cu sulfide mineralization Eastern Xinjiang
文献子类	Article
英文摘要	Early Permian mafic-ultramafic complexes in Eastern Xinjiang are mainly distributed in the Jueluotage belt, Central Tianshan massif and Beishan area. The orthopyroxene in these complexes is mostly bronzite and minor hypersthene, and the clinopyroxene is composed of diopside, endiopside and augite. Systematic mineral mapping shows higher Fo and Ni contents of olivine in Beishan than that of Jueluotage belt and Central Tianshan. Fo in the range of 78 similar to 86 and Ni contents less than 1800 x 10(-6) in olivine are more favorable for Ni-Cu sulfide mineralization. The values of En in orthopyroxene and Wo in clinopyroxene also show north-southward increasing and relatively small range value contributes to ore-formation. The Al-IV/Al-VI of clinopyroxene suggests that the pressure is relatively low during fractional crystallization in Beishan, resulting in weaker mineralization than Jueluotage belt and Central Tianshan. The Jueluotage belt, Central Tianshan and Beishan show characteristics of non-alkaline parent magma series, and crystallized from tholeiitic magma. The parental magma of Pobei and Xiangshanzhong are characterized by enrichments in LREE, and depletion in Nb, Ta, Zr and Hf. These features suggest that a depleted mantle metasomatized by subducted slab-derived fluid or melt. The Alz vs. Ti of clinopyroxene implies stronger metasomatism caused by subduction in Jueluotage belt and Central Tianshan. The occurrence of Ti high-anomaly in clinopyroxene of Beishan mafic-ultramafic complexes and mineral temperature calculations show higher magma temperatures in Beishan, which implies that the magmatism has a close relationship with Tarim Permian mantle plume.
WOS关键词	ASIAN OROGENIC BELT ; ORE-FORMING PROCESSES ; NW CHINA IMPLICATIONS ; TRACE-ELEMENTS ; BEISHAN AREA ; SULFIDE DEPOSIT ; TARIM BASIN ; U-PB ; GEOCHEMICAL CHARACTERISTICS ; FRACTIONAL CRYSTALLIZATION
WOS研究方向	Geology
语种	英语
WOS记录号	WOS:000361075200005
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/62254]
专题	地质与地球物理研究所_中国科学院矿产资源研究重点实验室
作者单位	1.Chinese Acad Sci, Key Lab Mineral Resources, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Xue ShengChao,Qin KeZhang,Tang DongMei,et al. Compositional characteristics of pyroxenes from Permian mafic-ultramafic complexes in Eastern Xinjiang, and their implications for petrogenesis and Ni-Cu mineralization[J]. ACTA PETROLOGICA SINICA,2015,31(8):2175-2192.
APA	Xue ShengChao,Qin KeZhang,Tang DongMei,Mao YaJing,&Yao ZhuoSen.(2015).Compositional characteristics of pyroxenes from Permian mafic-ultramafic complexes in Eastern Xinjiang, and their implications for petrogenesis and Ni-Cu mineralization.ACTA PETROLOGICA SINICA,31(8),2175-2192.
MLA	Xue ShengChao,et al."Compositional characteristics of pyroxenes from Permian mafic-ultramafic complexes in Eastern Xinjiang, and their implications for petrogenesis and Ni-Cu mineralization".ACTA PETROLOGICA SINICA 31.8(2015):2175-2192.