Geochronology and geochemistry of the Middle Proterozoic Aoyougou;ophiolite in the North Qilian Mountains, northwestern China

	Geochronology and geochemistry of the Middle Proterozoic Aoyougou;ophiolite in the North Qilian Mountains, northwestern China
	Zhang, ZC 5; Mao, JW ; Zuo, GC ; Yang, JM ; Robinson, PT
刊名	ACTA GEOLOGICA SINICA-ENGLISH EDITION
	2001
卷号	75 期号:1 页码:41-50
关键词	Proterozoic ophiolite geochronology geochemistry North Qilian Mountains
ISSN号	1000-9515
英文摘要	The Aoyougou ophiolite lies in an early Palaeozoic orogenic belt of the western North Qilian Mountains, near the Aoyougou valley in Gansu Province, northwestern China. It consists of serpentinite, a cumulate sequence of gabbro and diorite, pillow and massive lavas, diabase and chert. Ages of 1840 +/-2 Ma, 1783 +/-2 Ma and 1784 +/-2 Ma on three zircons from diabase, indicate an early Middle Proterozoic age. The diabases and basalts show light rare-earth element enrichment and have relatively high TiO(2) contents, characteristic of ocean island basalts. All of the lavas have low MgO, Cr, Ni contents and Mg numbers indicating a more evolved character. They are believed to have been derived from a more mafic parental magma by fractionation of olivine, Cr-spinel and minor plagioclase. Based on the lava geochemistry and regional geology, the Aoyougou ophiolite was probably believed to have formed at a spreading centre in a small marginal basin. Subduction of the newly formed oceanic lithosphere in the Middle Proterozoic produced a trench-are-basin system, which is preserved in the North Qilian Mountains.
学科主题	火成岩岩石学
WOS研究方向	Geology
语种	英语
出版者	WILEY-BLACKWELL
WOS记录号	WOS:000168021700005
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/37473]
专题	中国地质科学院地质研究所
作者单位	1.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China. 2.Chinese Acad Biol Sci, Inst Mineral Deposits, Beijing 100037, Peoples R China. 3.Gansu Bur Geol & Mineral Resources, Inst Geol, Lanzhou 730000, Peoples R China. 4.Dalhousie Univ, Ctr Marine Geol, Halifax, NS B3H 3J5, Canada. 5.中国地质科学院地质研究所
推荐引用方式 GB/T 7714	Zhang, ZC,Mao, JW,Zuo, GC,et al. Geochronology and geochemistry of the Middle Proterozoic Aoyougou;ophiolite in the North Qilian Mountains, northwestern China[J]. ACTA GEOLOGICA SINICA-ENGLISH EDITION,2001,75(1):41-50.
APA	Zhang, ZC,Mao, JW,Zuo, GC,Yang, JM,&Robinson, PT.(2001).Geochronology and geochemistry of the Middle Proterozoic Aoyougou;ophiolite in the North Qilian Mountains, northwestern China.ACTA GEOLOGICA SINICA-ENGLISH EDITION,75(1),41-50.
MLA	Zhang, ZC,et al."Geochronology and geochemistry of the Middle Proterozoic Aoyougou;ophiolite in the North Qilian Mountains, northwestern China".ACTA GEOLOGICA SINICA-ENGLISH EDITION 75.1(2001):41-50.