Early Palaezoic grranitoid magmatism and tectonic evolution in North Qilian, NW China.

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	Early Palaezoic grranitoid magmatism and tectonic evolution in North Qilian, NW China.
	Wu, CL (Wu CaiLai); Xu, XY (Xu XueYi); Gao, QM (Gao QianMing); Li, XM (Li XiangMin); Lei, M (Lei Min); Gao, YH (Gao YuanHong); Frost, RB (Frost, Ronald B.); Wooden, JL (Wooden, Joseph L.)
刊名	ACTA PETROLOGICA SINICA
	2010
卷号	26 期号:4 页码:1027-1044
关键词	Granite Zircon SHRIMP dating Magmatism Tectonic evolution North Qilian
ISSN号	1000-0569
英文摘要	Zircon SHRIMP dating of granitoids from the middle segment of North Qilian showed that they are 512 Ma and 501 Ma for plagiogranite and quartz diorite from Kokoli, 508Ma for Yemazhui granite, and 424Ma for Jinfusi granite, respectively. Based on petrogeochemistry of granites and occurrence in tectonics, combined with the dating of other granites and regional geological data, we think that North Qilian oceanic plate was subducted southward under the Middle Qilian terrane, which caused two episodes of magmatism, one was forming Kokoli plagiogranite (512Ma), Yemazui granite (508Ma) and Kokoli quartz diorite (501 Ma), another forming Niuxinshan granite (477Ma). Lately, subduction polarity for the North Qilian basin changed from southward to northward because it was blocked by the deep subduction of Qaidam continental plate northward on the south of Qilian, which formed Minleyaogou granite (463Ma). After about 440 Ma, the Qilian Ocean was closed because of collision between Qaidam and Alax terrane, forming the North Qilian orogen. The post-collision granites such as Jinfusi granite (424Ma) and Niuxinshan quartz diorite (435Ma), and so on, were formed in the North Qilian Orogen where different blocks stretched and collapsed because of lithosphere delamination below the orogen.
学科主题	构造地质学
WOS关键词	GEOCHEMICAL CLASSIFICATION ; OCEANIC SUBDUCTION ; MOUNTAINS ; ROCKS ; AMPHIBOLITE ; ORIGIN ; MANTLE ; ND ; LITHOSPHERE ; ECLOGITE
WOS研究方向	Geology
语种	中文
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000277950600003
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39185]
专题	中国地质调查局
作者单位	Stanford Univ, Stanford, CA 94305 USA
推荐引用方式 GB/T 7714	Wu, CL ,Xu, XY ,Gao, QM ,et al. Early Palaezoic grranitoid magmatism and tectonic evolution in North Qilian, NW China.[J]. ACTA PETROLOGICA SINICA,2010,26(4):1027-1044.
APA	Wu, CL .,Xu, XY .,Gao, QM .,Li, XM .,Lei, M .,...&Wooden, JL .(2010).Early Palaezoic grranitoid magmatism and tectonic evolution in North Qilian, NW China..ACTA PETROLOGICA SINICA,26(4),1027-1044.
MLA	Wu, CL ,et al."Early Palaezoic grranitoid magmatism and tectonic evolution in North Qilian, NW China.".ACTA PETROLOGICA SINICA 26.4(2010):1027-1044.