Geochemistry, zircon U-Pb ages and tectonic settings of the Dahalajunshan volcanics and granitic intrusions from the Adengtao area in the Southeast Zhaosu, western Tianshan Mountains

	Geochemistry, zircon U-Pb ages and tectonic settings of the Dahalajunshan volcanics and granitic intrusions from the Adengtao area in the Southeast Zhaosu, western Tianshan Mountains
	Li JiLei 1,2; Qian Qing 1; Gao Jun 1; Su Wen 1; Zhang Xi 1,2; Liu Xin 1,2; Jiang Tuo 1,2
刊名	ACTA PETROLOGICA SINICA
	2010-10-01
卷号	26 期号:10 页码:2913-2924
关键词	Western Tianshan Dahalajunshan Formation Volcanic Rocks Granite Zircon U-pb Age Tectonic Setting
ISSN号	1000-0569
文献子类	Article
英文摘要	The volcanic rocks of the Dahalajunshan Formation from the Adengtao area (Southeast Zhaosu) in the Chinese western Tianshan Mountains are dominantly composed of basaltic andesites which are characterized by enrichment of large ion lithophile elements (LILE), strong depletion of high field strength elements such as Nb, Ta and Ti and highly fractionation of rare earth elements (REEs). These basaltic andesites are intruded by some K-feldspar granite and granite porphyry dykes. The K-feldspar granite dykes are metaluminous and have high Na2O + K2O, light rare earth elements (LREEs), Zr, Nb and Y contents, high FeOT/MgO and Ga/Al ratios, and both the granitoids are depleted in Ba, Sr, P, Ti and Eu. The granitoids (K-feldspar granite and granite porphyry) give Laser-ICPMS zircon U-Pb ages of 354. 2 +/- 2. 3Ma and 339.5 +/- 2. 3Ma respectively, indicating that the surrounding Dahalajunshan volcanics were formed no later than the earliest stage of the Early Carboniferous. It is proposed that the volcanic rocks of the Dahalajunshan Formation and the Early Carboniferous A-type granites from the Adengtao area in the Southeast Zhaosu were probably formed in a back-arc extensional environment of an active continental margin, based on a combined analysis of the field observations, regional tectonics, and the geochemistry and ages of the rocks.
WOS关键词	A-TYPE GRANITES ; LACHLAN FOLD BELT ; NW CHINA ; ISOTOPIC GEOCHEMISTRY ; NORTHWESTERN CHINA ; MARIANA TROUGH ; BASIN BASALTS ; I-TYPE ; ROCKS ; PETROGENESIS
WOS研究方向	Geology
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000284450800004
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/73410]
专题	中国科学院地质与地球物理研究所
通讯作者	Li JiLei
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Li JiLei,Qian Qing,Gao Jun,et al. Geochemistry, zircon U-Pb ages and tectonic settings of the Dahalajunshan volcanics and granitic intrusions from the Adengtao area in the Southeast Zhaosu, western Tianshan Mountains[J]. ACTA PETROLOGICA SINICA,2010,26(10):2913-2924.
APA	Li JiLei.,Qian Qing.,Gao Jun.,Su Wen.,Zhang Xi.,...&Jiang Tuo.(2010).Geochemistry, zircon U-Pb ages and tectonic settings of the Dahalajunshan volcanics and granitic intrusions from the Adengtao area in the Southeast Zhaosu, western Tianshan Mountains.ACTA PETROLOGICA SINICA,26(10),2913-2924.
MLA	Li JiLei,et al."Geochemistry, zircon U-Pb ages and tectonic settings of the Dahalajunshan volcanics and granitic intrusions from the Adengtao area in the Southeast Zhaosu, western Tianshan Mountains".ACTA PETROLOGICA SINICA 26.10(2010):2913-2924.