Assembly of the Lhasa and Qiangtang terranes in central Tibet by divergent double subduction
Assembly of the Lhasa and Qiangtang terranes in central Tibet by divergent double subduction
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西藏中部拉萨地体和羌塘地体的发散性双俯冲组装
DOI：
10.1016/j.lithos.2015.06.023
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发表时间：
2016-02
期刊：
影响因子：
3.5
通讯作者：
Li-Quan Wang
中科院分区：
文献类型：
--
作者：
Di-Cheng Zhu;Shi-Min Li;Peter A. Cawood;Qing Wang;Zhi-Dan Zhao;Sheng-Ao Liu;Li-Quan Wang
西藏中部拉萨-羌塘碰撞带（包括班公缝合带以及拉萨和羌塘地体的邻近区域）的岩石地层、岩浆和变质数据的整合表明，通过发散的双面俯冲拼合。该碰撞带的特点是不存在早白垩世高级变质岩，并且存在广泛的岩浆作用，并且在大约 100 处地幔贡献增强。 120–110 Ma。在羌塘地体西部的才玛—多布扎—绒玛—康琼—安多岩浆带和拉萨地体北部的阿龙措—盐湖—大果—班戈—达如措岩浆带中发现了两条侏罗纪—白垩纪岩浆弧。这两条岩浆弧分别反映了班公洋岩石圈向北和向南的俯冲。现有的多学科数据一致认为，班公海可能在晚侏罗世至早白垩世（最有可能约 140-130 Ma）期间通过弧与弧“软”碰撞而不是大陆与大陆“硬”碰撞而闭合。与拉萨地体下方汇聚相关的俯冲带后退可能导致拉萨地体裂谷并与冈瓦纳大陆北缘分离，导致其在亚洲内增生。
Integration of lithostratigraphic, magmatic, and metamorphic data from the Lhasa–Qiangtang collision zone in central Tibet (including the Bangong suture zone and adjacent regions of the Lhasa and Qiangtang terranes) indicates assembly through divergent double sided subduction. This collision zone is characterized by the absence of Early Cretaceous high-grade metamorphic rocks and the presence of extensive magmatism with enhanced mantle contributions at ca. 120–110 Ma. Two Jurassic–Cretaceous magmatic arcs are identified from the Caima–Duobuza–Rongma–Kangqiong–Amdo magmatic belt in the western Qiangtang Terrane and from the Along Tso–Yanhu–Daguo–Baingoin–Daru Tso magmatic belt in the northern Lhasa Terrane. These two magmatic arcs reflect northward and southward subduction of the Bangong Ocean lithosphere, respectively. Available multidisciplinary data reconcile that the Bangong Ocean may have closed during the Late Jurassic–Early Cretaceous (most likely ca. 140–130 Ma) through arc–arc “soft” collision rather than continent–continent “hard” collision. Subduction zone retreat associated with convergence beneath the Lhasa Terrane may have driven its rifting and separation from the northern margin of Gondwana leading to its accretion within Asia.
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影响因子：
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