Early Paleozoic tectonic evolution of the Chinese South Tianshan Orogen:   constraints from SHRIMP zircon U-Pb geochronology and geochemistry of   basaltic and dioritic rocks from Xiate, NW China

doi:10.1007/s00531-007-0268-x

CORC > 北京大学 > 地球与空间科学学院

	Early Paleozoic tectonic evolution of the Chinese South Tianshan Orogen: constraints from SHRIMP zircon U-Pb geochronology and geochemistry of basaltic and dioritic rocks from Xiate, NW China
	Qian, Qing ; Gao, Jun ; Klemd, Reiner ; He, Guoqi ; Song, Biao ; Liu, Dunyi ; Xu, Ronghua
刊名	international journal of earth sciences
	2009
关键词	South Tianshan Early Paleozoic MORB Adakite SHRIMP geochronology Geochemistry MIDOCEAN RIDGE BASALTS LOWER CONTINENTAL-CRUST EAST PACIFIC RISE TIEN-SHAN NORTHWESTERN CHINA VOLCANIC-ROCKS CENTRAL-ASIA SUBDUCTED LITHOSPHERE OPHIOLITE COMPLEX AGE CONSTRAINTS
DOI	10.1007/s00531-007-0268-x
英文摘要	Traditionally the Chinese South Tianshan has been regarded as a late Paleozoic orogenic belt. However, little is known about the early Paleozoic tectonic architecture of the region. This paper presents the first evidence of Cambrian-Ordovician MORB-type basalts and adakitic diorites on the southern margin of the Yili plate in China. Basalts from Xiate in southwestern Tianshan show a typical transitional (T-) MORB and ferrobasalt composition, which indicate a formation at a propagating spreading ridge. The basalts give a weighted mean (206)Pb/(238)U crystallization age of 516.3 +/- A 7.4 Ma by SHRIMP U-Pb zircon dating and have experienced contact metamorphism due to the intrusion of a dioritic pluton. The dioritic pluton has a weighted mean (206)Pb/(238)U crystallization age of 470 +/- A 12 Ma and geochemical characteristics resembling that of adakitic rocks. The pluton is considered to have been formed by partial melting of garnet amphibolites from thickened lower crust in arc or continental collision settings. The basalts and diorites are considered to outline the eastern extension of the early Paleozoic suture zone, the Nikolaev Line, which stretches east-west for hundreds of kilometers between the Northern Tianshan and Central Tianshan terranes of Kyrgyzstan. Our findings substantiate that the Yili and Central Tianshan plates were separated by the early Paleozoic Terskey ocean. The Terskey ocean probably closed during the early stage of the late Ordovician (Lomize et al. in Geotectonics 31(6):463-482, 1997), resulting in the final amalgamation of the Yili and Central Tianshan plates. Consequently, an early Paleozoic suture zone is documented in the Chinese Tianshan region, which is most likely represented by the North Nalati fault.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000264482600005&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; Geosciences, Multidisciplinary; SCI(E); 97; ARTICLE; 3; 551-569; 98
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/246376]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Qian, Qing,Gao, Jun,Klemd, Reiner,et al. Early Paleozoic tectonic evolution of the Chinese South Tianshan Orogen: constraints from SHRIMP zircon U-Pb geochronology and geochemistry of basaltic and dioritic rocks from Xiate, NW China[J]. international journal of earth sciences,2009.
APA	Qian, Qing.,Gao, Jun.,Klemd, Reiner.,He, Guoqi.,Song, Biao.,...&Xu, Ronghua.(2009).Early Paleozoic tectonic evolution of the Chinese South Tianshan Orogen: constraints from SHRIMP zircon U-Pb geochronology and geochemistry of basaltic and dioritic rocks from Xiate, NW China.international journal of earth sciences.
MLA	Qian, Qing,et al."Early Paleozoic tectonic evolution of the Chinese South Tianshan Orogen: constraints from SHRIMP zircon U-Pb geochronology and geochemistry of basaltic and dioritic rocks from Xiate, NW China".international journal of earth sciences (2009).