Nature of primitive magmas of Early Permian basalts in Tuha basin, Xinjiang: Constraints from melt inclusions

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

	Nature of primitive magmas of Early Permian basalts in Tuha basin, Xinjiang: Constraints from melt inclusions
	Tang DongMei 1; Qin KeZhang 1,2; Xue ShengChao 1,2; Mao YaJing 1; Tian Ye 1; Liu YongSheng 3; Mao Qian 4
刊名	ACTA PETROLOGICA SINICA
	2017
卷号	33 期号:2 页码:339-353
关键词	Early Permian Basalt Tuha Basin Melt Inclusion Parental Magma
ISSN号	1000-0569
文献子类	Article
英文摘要	The Permian basalts in the eastern Tianshan, NE Xinjiang, mostly distribute along the ENE fault in this area. The Ar-Ar age of the basalts in the Tuha basin is 298Ma. This confirms that the Tuha basalt is coeval with former basalts and sulfide-bearing mafic-ultramafic intrusion in the Tianshan region. The Tuha basalts have similar compositional features to island arc tholeiites and continental arc basalts, LREE enrichment and negative Nb and Ta anomaly, and are probably related with mantle metasomatized by subduction slab. The Tuha basalts have fresh olivine and plagioclase phenocrysts and in olivine phenocrysts which occurred many melt inclusions (MI). The opaque material in the melt inclusion are magnetite, suggest high Fe and oxygen fugacity when the formation of melt inclusions. The contents of melt inclusions show two types of high and low MgO. Furthermore, MI with high MgO content has low SiO2, trace elements and REE abundance; maybe indicate the characteristics of high partial melting and low degree evolution of mantle. The high MgO melt show depleted of Nb and Ta and the N-MORB type trace element and REE normalized patterns, reveal the melt had been metasomatized by subducted slab-derived fluid or melt. The low Th and Ta abundances, weaker Nb and Ta negative anomaly of MI, relative to Tuha basalts, implied the weaker metasomatism and less segregation. The Cu contents (12.4x10(-6)similar to 299x10(-6)) of the melt inclusions are similar with the basaltic magma, while the Ni contents (236x10(--6)similar to 697x10(-6)) of them are higher than the high Mg komatiitic and oceanic ridge basalts. A small number of sulfide segregation in deeper and more depleted of Cu than Ni due to higher partition coefficient of Cu can explain the decoupling of Cu and Ni content in the melt. Ni contents in parental magma are relatively higher than Cu may be the key factor which controls the total Ni/Cu ratios of sulfide ores is greater than 1.0 in Eastern Tianshan mafic-ultramafic intrusion related magmatic sulfide deposits.
WOS关键词	ASIAN OROGENIC BELT ; MAFIC-ULTRAMAFIC COMPLEXES ; PLATINUM-GROUP ELEMENTS ; NW CHINA ; EASTERN XINJIANG ; NORTHWEST CHINA ; TRACE-ELEMENTS ; MANTLE PLUME ; ICP-MS ; BEARING
WOS研究方向	Geology
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000397326900003
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/53057]
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
通讯作者	Tang DongMei
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China 4.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Tang DongMei,Qin KeZhang,Xue ShengChao,et al. Nature of primitive magmas of Early Permian basalts in Tuha basin, Xinjiang: Constraints from melt inclusions[J]. ACTA PETROLOGICA SINICA,2017,33(2):339-353.
APA	Tang DongMei.,Qin KeZhang.,Xue ShengChao.,Mao YaJing.,Tian Ye.,...&Mao Qian.(2017).Nature of primitive magmas of Early Permian basalts in Tuha basin, Xinjiang: Constraints from melt inclusions.ACTA PETROLOGICA SINICA,33(2),339-353.
MLA	Tang DongMei,et al."Nature of primitive magmas of Early Permian basalts in Tuha basin, Xinjiang: Constraints from melt inclusions".ACTA PETROLOGICA SINICA 33.2(2017):339-353.