Multiple Accretionary Orogenesis and Episodic Growth of Continents: Insights from the Western Kunlun Range, Central Asia
Multiple Accretionary Orogenesis and Episodic Growth of Continents: Insights from the Western Kunlun Range, Central Asia
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DOI：
10.2747/0020-6814.45.4.303
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发表时间：
2003-04
影响因子：
2.6
通讯作者：
W. Xiao;Fanglin Han;B. Windley;C. Yuan;Hui Zhou;Jiliang Li
中科院分区：
文献类型：
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作者：
W. Xiao;Fanglin Han;B. Windley;C. Yuan;Hui Zhou;Jiliang Li
位于西藏西北部的西昆仑山记录了中亚地壳的扩张历史。早奥陶世，一个向南倾斜的洋内俯冲-增生杂岩增生到塔里木地块，形成晚奥陶世的安第斯型陆缘。该边缘在早志留世向南生长（现今坐标），在其南侧有一个增生杂岩，库地片麻岩-片岩杂岩与之相连。泥盆纪-石炭纪期间，碎屑沉积物继续充填弧前/弧内盆地的弧增生杂岩的顶部。在早石炭世至中石炭世，构造和岩浆的平静是由没有火山岩和深成岩在库迪地区，而俯冲仍然活跃在西部的范围内的Gaz地区附近的今天帕米尔结。晚石炭世-二叠纪-早中生代增生弧和前弧发育于安第斯型陆缘前缘，表明晚石炭世北倾俯冲作用重新开始。中侏罗世喀喇昆仑-北羌塘地块最终碰撞西昆仑造山拼贴，古特提斯闭合。西昆仑造山带的增生和发展为亚洲地壳生长提供了大量的物质。
The Western Kunlun Range in northwestern Tibet records a history of enlargement of the Central Asian crust. In the Early Ordovician a south-dipping intra-oceanic subduction-accretion complex was accreted to the Tarim block, forming an Andean-type margin in the Late Ordovician. This margin grew southward (present-day coordinates) in the Early Silurian, with an accretionary complex on its southern side against which the Kudi gneiss-schist complex was attached. Clastic sediments continued to infill forearc/intra-arc basins on the top of the arc-accretionary complexes during Devonian-Carboniferous time. In the Early to Mid-Carboniferous, tectonic and magmatic quiescence is indicated by an absence of volcanic and plutonic rocks in the Kudi area, whereas subduction was still active in the western part of the range in the Gaz area near the present-day Pamir syntaxis. A Late Carboniferous-Permian to Early Mesozoic accretionary arc and forearc developed in front of the Andean-type margin, indicating that north-dipping subduction was renewed in the Late Carboniferous. Final collision of the Karakoram-North Qiangtang block to the western Kunlun orogenic collage by the Mid-Jurassic resulted in closure of Paleo-Tethys. The accretion and development of the Western Kunlun orogen contributed huge quantities of material for the crustal growth of Asia.