A permian layered intrusive complex in the western tarim block, northwestern China: Product of a Ca. 275-ma mantle plume?

doi:10.1086/587726

	A permian layered intrusive complex in the western tarim block, northwestern China: Product of a Ca. 275-ma mantle plume?
	Zhang, Chuan-Lin 1,4; Li, Xian-Hua 2; Li, Zheng-Xiang 3; Ye, Hai-Min 4; Li, Chang-Nian 5
刊名	JOURNAL OF GEOLOGY
	2008-05-01
卷号	116 期号:3 页码:269-287
ISSN号	0022-1376
DOI	10.1086/587726
文献子类	Article
英文摘要	Zircon laser ablation inductively coupled plasma mass spectrometry U-Pb age and geochemical and Sr-Nd-Hf isotopic data are reported for the Bachu layered intrusive complex (BLIC) in the western Tarim Block and are used to assess the possible presence of a Permian large igneous province (LIP) in the region. The BLIC intrudes the Silurian-Devonian sedimentary rocks, and our U-Pb zircon dating gives a crystallization age of Ma. Rock types of the BLIC 274 +/- 2 include pyroxenite, diorite, syenite, and quartz syenite, with a wide range of SiO2 contents (38.6%-68.7%) and variably high alkalinity (Na2O + K2O = 1.5%-12.0%). They are enriched in Rb, Ba, Th, Nb, Ta, Zr, (Na2O + K2O = 1.5%-12.0% K2O/Na2O = 0.23-0.9) Hf, and light rare earth elements. Isotopically, they are characterized by positive whole-rock epsilon Nd(t) values (0.25-2.8, mostly above 2.0) and zircon epsilon Hf(t) values (5.8-8.9) and low initial Sr-87/Sr-86 ratios (0.7035-0.7045). These features suggest that the BLIC was likely formed by crystal cumulation and fractionation (with negligible crustal contamination) of alkali basalts derived from an ocean island basalt-like mantle source (i.e., the asthenospheric mantle) in an extensional regime. We suggest that these mid-Permian igneous rocks, in combination with the voluminous coeval basalts and intrusive rocks covering an total area of ca. 250,000 km(2) in the Tarim Block and surrounding regions, constitute an LIP (the "Bachu LIP") and that the BLIC could be the residue of a feeder for this LIP.
WOS关键词	U-PB GEOCHRONOLOGY ; BIMODAL VOLCANIC-ROCKS ; ASIAN OROGENIC BELT ; A-TYPE GRANITES ; TECTONIC IMPLICATIONS ; SOUTH CHINA ; NW CHINA ; GEOCHEMICAL CHARACTERISTICS ; ACCRETIONARY TECTONICS ; TIANSHAN MOUNTAINS
WOS研究方向	Geology
语种	英语
出版者	UNIV CHICAGO PRESS
WOS记录号	WOS:000255429100004
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/69506]
专题	中国科学院地质与地球物理研究所
通讯作者	Zhang, Chuan-Lin
作者单位	1.Chinese Acad Sci, Key Lab Isotope Geochronol & Geochem, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China 2.Chinese Acad Sci, State Key Lab Lithospher Evolut, Inst Geol & Geophys, Beijing 100029, Peoples R China 3.Curtin Univ Technol, Dept Appl Geol, Inst Geosci Res, Perth, WA 6845, Australia 4.Nanjing Inst Geol & Mineral Resources, Nanjing 210016, Peoples R China 5.China Univ Geosci, Dept Earth Sci, Wuhan 430074, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Chuan-Lin,Li, Xian-Hua,Li, Zheng-Xiang,et al. A permian layered intrusive complex in the western tarim block, northwestern China: Product of a Ca. 275-ma mantle plume?[J]. JOURNAL OF GEOLOGY,2008,116(3):269-287.
APA	Zhang, Chuan-Lin,Li, Xian-Hua,Li, Zheng-Xiang,Ye, Hai-Min,&Li, Chang-Nian.(2008).A permian layered intrusive complex in the western tarim block, northwestern China: Product of a Ca. 275-ma mantle plume?.JOURNAL OF GEOLOGY,116(3),269-287.
MLA	Zhang, Chuan-Lin,et al."A permian layered intrusive complex in the western tarim block, northwestern China: Product of a Ca. 275-ma mantle plume?".JOURNAL OF GEOLOGY 116.3(2008):269-287.