Age, geochemistry and tectonic setting of Buqingshan ophiolites, North Qinghai-Tibet Plateau, China
Bian, QT; Li, DH; Pospelov, I; Yin, LM (尹磊明); Li, HS; Zhao, DS; Chang, CF; Luo, XQ; Gao, SL; Astrakhantsev, O
2004-08-01
发表期刊JOURNAL OF ASIAN EARTH SCIENCES
ISSN1367-9120
卷号23期号:4页码:577-596
摘要

The Buqingshan ophiolite complex is a sector of the A'nyemaqen ophiolite belt in the East Kunlun southern marginal suture zone in the northern part of the Qinghai-Tibet Plateau. The WNW-trending ophiolite complex consists of metaperidotite, gabbro, diabase, pillow basalt, massive basalt and pelagic sedimentary rocks including radiolarian chert. We have determined that Early Paleozoic and Early Carboniferous-Early Permian ophiolites are present in this ophiolite complex that were previously thought of Permian-Middle Triassic age. A zircon U-Pb age of 467.2 +/- 0.9 Ma for gabbro, and a Rb-Sr isochron age of 481 +/- 130 Ma for diabase and gabbro have been obtained from the Early Paleozoic ophiolite slice, and Middle-Late Ordovician acritarchs have been found in the melange matrix that envelopes the sliver. We interpret the first two ages to represent the formation age of the ophiolite. Granodiorite-tonalite plutons with a zircon U-Pb age of 402 +/- 24 Ma intrude the slice. Early Carboniferous-Early Permian radiolarians have been discovered in cherts and argillaceous cherts in the second ophiolite slice. Geochemistry indicates that metaperidotites in the first slice represent a depleted ocean lithosphere mantle. Most mafic rocks in the Early Paleozoic ophiolite are of N-MORB type with small amount of T-MORB, and they resulted from the magma from the depleted oceanic lithosphere mantle with little crustal contamination. The basalts in the Early Carboniferous-Early Permian ophiolite have similar characteristics to the mafic rocks and also show DUPAL anomaly and a mixed source of DMM and EM II. The original formation environments of the two-stage ophiolites are both mid-ocean ridges. These lines of evidence suggest that a mature Early Paleozoic Kunlun-Qilian-Qinling ocean basin and a mature Paleotethyan ocean basin once existed in the study area. (C) 2004 Elsevier Ltd. All rights reserved.

关键词Ophiolite Tibetan Plateau East Kunlun Shan
DOI10.1016/j.jseaes.2003.09.003
语种英语
关键词[WOS]Pb ; Contamination ; Evolution ; Diagram ; Genesis ; Zircon
WOS研究方向Geology
WOS类目Geosciences, Multidisciplinary
WOS记录号WOS:000222808100010
出版者PERGAMON-ELSEVIER SCIENCE LTD
文献类型期刊论文
条目标识符http://ir.nigpas.ac.cn/handle/332004/986
专题中国科学院南京地质古生物研究所
通讯作者Bian, QT
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Ctr Space Sci & Appl Res, Beijing 100717, Peoples R China
3.Russian Acad Sci, Inst Geol, Moscow 109017, Russia
4.Chinese Acad Sci, Nanjing Inst Geol & Paleontol, Nanjing 210008, Peoples R China
推荐引用方式
GB/T 7714
Bian, QT,Li, DH,Pospelov, I,et al. Age, geochemistry and tectonic setting of Buqingshan ophiolites, North Qinghai-Tibet Plateau, China[J]. JOURNAL OF ASIAN EARTH SCIENCES,2004,23(4):577-596.
APA Bian, QT.,Li, DH.,Pospelov, I.,Yin, LM .,Li, HS.,...&Chamov, N.(2004).Age, geochemistry and tectonic setting of Buqingshan ophiolites, North Qinghai-Tibet Plateau, China.JOURNAL OF ASIAN EARTH SCIENCES,23(4),577-596.
MLA Bian, QT,et al."Age, geochemistry and tectonic setting of Buqingshan ophiolites, North Qinghai-Tibet Plateau, China".JOURNAL OF ASIAN EARTH SCIENCES 23.4(2004):577-596.
条目包含的文件
文件名称/大小 文献类型 版本类型 开放类型 使用许可
11.pdf(864KB)期刊论文出版稿开放获取CC BY-NC-SA请求全文
个性服务
查看访问统计
谷歌学术
谷歌学术中相似的文章
[Bian, QT]的文章
[Li, DH]的文章
[Pospelov, I]的文章
百度学术
百度学术中相似的文章
[Bian, QT]的文章
[Li, DH]的文章
[Pospelov, I]的文章
必应学术
必应学术中相似的文章
[Bian, QT]的文章
[Li, DH]的文章
[Pospelov, I]的文章
相关权益政策
暂无数据
收藏/分享
所有评论 (0)
暂无评论
 

除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。