Age, geochemistry and tectonic setting of Buqingshan ophiolites, North Qinghai-Tibet Plateau, China
文献类型：期刊论文
| 作者 | Bian, QT; Li, DH; Pospelov, I; Yin, LM; Li, HS; Zhao, DS; Chang, CF; Luo, XQ; Gao, SL; Astrakhantsev, O |
| 刊名 | JOURNAL OF ASIAN EARTH SCIENCES
 |
| 出版日期 | 2004-08-01 |
| 卷号 | 23期号:4页码:577-596 |
| 关键词 | ophiolite Tibetan plateau East Kunlun Shan |
| ISSN号 | 1367-9120 |
| DOI | 10.1016/j.jseaes.2003.09.003 |
| 文献子类 | Article |
| 英文摘要 | 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. |
| WOS关键词 | PB ; CONTAMINATION ; EVOLUTION ; DIAGRAM ; GENESIS ; ZIRCON |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000222808100010 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/79339]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 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. |
入库方式： OAI收割
来源：地质与地球物理研究所
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