• 责任者：Li Jianfeng (Guangzhou Institute of Geochemistry ; CAS ; Guangzhou 510640 ; China) ; Xia Bin
• 刊名：Geotectonica et Metallogenia
• 出版年：2009
• 卷期：33(2)
• 关键词：蛇绿岩 ; ophiolite ; 铀—铅计时 ; U-Pb dating ; 辉长岩 ; gabbros ; 西藏 ; Tibet
• 页码：p.294-298
• 图表：3 illus., 1 table, 19 refs.
• 分类号：1300
• issnNo：ISSN1001-1552
• isbnNo：CN44-1595/P

ass=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left>ang=EN-US style="FONT-SIZE: 14pt">ace="Times New Roman">///In this paper, zircon SHRIMP U-Pb technique was applied to the gabbro in Qunrang ophiolite, west of the Yanglung Tangbo suture zone. A ²⁰⁶Pb/²³⁸U mean age 125.6ascii-font-family: ’Times New Roman’; mso-hansi-font-family: ’Times New Roman’">±ang=EN-US style="FONT-SIZE: 14pt">ace="Times New Roman">0.88 Ma (2ascii-font-family: ’Times New Roman’; mso-hansi-font-family: ’Times New Roman’">σang=EN-US style="FONT-SIZE: 14pt">ace="Times New Roman">, MSWD=1.9) was obtained, which is the crystallization time of the gabbro. Compared with the former reported ophiolite ages in the Yanglung Tangbo suture zone (122.3ascii-font-family: ’Times New Roman’; mso-hansi-font-family: ’Times New Roman’">±ang=EN-US style="FONT-SIZE: 14pt">ace="Times New Roman">2.4 Ma for Xiugang=EN-US style="FONT-SIZE: 14pt">ace="Times New Roman">ugabu ophiolite in the western part, 126ascii-font-family: ’Times New Roman’; mso-hansi-font-family: ’Times New Roman’">±ang=EN-US style="FONT-SIZE: 14pt">ace="Times New Roman">1.5 Ma for the Dazhuka ophioilte and 123ascii-font-family: ’Times New Roman’; mso-hansi-font-family: ’Times New Roman’">±ang=EN-US style="FONT-SIZE: 14pt">ace="Times New Roman">1.8 Ma for the Jiding ophiolite in the middle part, while 162.9ascii-font-family: ’Times New Roman’; mso-hansi-font-family: ’Times New Roman’">±ang=EN-US style="FONT-SIZE: 14pt">ace="Times New Roman">2.8 Ma for Luobusha ophiolite in the eastern part), this age suggests that the extension time of Tethys oceanic basin in Qunrang region was consistent with the formation time of the Dazhuq and Tiding oceanic basin in the middle part, which indicates that the development of the oceanic basin was isochronous both in the middle part and the western part while was later than the development of oceanic basin in the eastern part of the Yanglung Tangbo Suture zone. From the geochronology data, the authors can deduce that the open time of the eastern tethys basin was characterized by the east earlier and the west later.amespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />