Geochemistry and Sr-Nd-Pb Isotopic Composition of Mafic Rocks in the Western Part of Yarlung Zangbo Suture Zone: Evidence for Intra-Oceanic Supra-Subduction within the Neo-Tethys

详细信息   

• 责任者：Liu Fei (State Key Laboratory for Continental Tectonic and Dynamics ; Institute of Geology ; Chinese Academy of Geological Sciences ; Beijing 100037 ; China) ; Yang Jingsui
• 刊名：Geology in China
• 出版年：2013
• 卷期：40(3)
• 关键词：镁铁质岩 ; mafic rocks ; 青藏高原 ; Qinghai-Tibetan Plateau
• 页码：p.742-755
• 图表：7 illus., 2 tables, 74 refs.
• 分类号：0801
• issnNo：ISSN1000-3657
• isbnNo：CN11-1167/P

摘要

 
    

     Ophiolites that discontinuously crop out along the Yarlung-Zangbo suture zone(YZSZ) are remnants of Neo-Tethyan ocean lithosphere emplaced during subduction of the Indian plate beneath Eurasia. The Purang massif is one of the largest ophiolites in the western part of the suture with exposed area of about 650 km² and consists dominantly of harzburgites, minor Cpx-harzburgites and dunites as well as a series of uppermost crustal rocks(siliceous limestone, siliceous shale, chert, basaltic lavas, and pyroclastic rocks), without cumulate rocks and pillow lava. A comparison with other YZSZ ophiolites suggests that various intra-oceanic supra-subduction events within the Neo-Tethys began in different periods.