NDLI: Forming age and tectono-petrogenises of the Jiugequan ophiolite in the North Qilian Mountain, NW China

Content Provider	Springer Nature Link
Author	Xia, XiaoHong Song, ShuGuang
Copyright Year	2010
Abstract	The Jiugequan ophiolite is one of the representative ophiolite fragments in the Early Paleozoic orogenic belt of the North Qilian Mountain. It has been drawn much attention and extensively studied in recent years. In this study, ion microprobe (SHRIMP) U-Pb dating was carried out for zircons from isotropic gabbro from the Jiugequan ophiolite. Eighteen analyses yield a relatively consistent apparent $^{206}$Pb/$^{238}$U ages from 480 to 508 Ma with a weighted mean age of 490±5 Ma (MSWD=1.06), which is believed to be the crystallization age of the gabbro and thus the forming age of the Jiugequan ophiolite. Major and trace element geochemical study indicates that the diabase-basalts from the Jiugequan ophiolite have N-MORB and E-MORB characteristics with some subduction-related signatures. The petrological, geochemical and chronological data enable us to conclude that the Jiugequan ophiolite is most likely to be formed at a spreading center of back-arc basin during the early Ordovician, while the ancient Qilian oceanic plate subducted northwards. The acquisition of forming age and determination of tectonic setting for Jiugequan ophiolite provide significant constraints on the evolution of intra-oceanic subduction system in the North Qilian orogenic belt during the Early Paleozoic era.
Starting Page	1899
Ending Page	1907
Page Count	9
File Format	PDF
ISSN	10016538
Journal	Chinese Science Bulletin
Volume Number	55
Issue Number	18
e-ISSN	18619541
Language	English
Publisher	SP Science China Press
Publisher Date	2010-06-13
Publisher Place	Heidelberg
Access Restriction	Subscribed
Subject Keyword	North Qilian Mountain Jiugequan ophiolite SHRIMP U-Pb dating spreading of back-arc basin Engineering Earth Sciences Chemistry/Food Science Physics Life Sciences Science
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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