【摘要】 通过深地震反射剖面,宽频天然深地震探测,广角折射、反射剖面,结合地表地质观察、岩石矿物和地球化学研究,以及弹性模拟计算等,对当前国际上流行的所谓高原北缘向南呈A型俯冲,南缘向北俯冲构成的青藏高原地壳加厚、隆升的“双俯冲”(two-sidedsubduction)模式提出质疑,认为高原北缘至少在西昆仑与塔里木(欧亚板块)之间不存在长距离的俯冲,在新生代以来的强劲挤压中,塔里木起到了一定的阻挡作用,在这里呈现南北向挤压应力场,因而青藏高原西北缘陆-陆碰撞造山、盆山的形成受到“南北双向挤压模式”所控制,也是造成青藏高原西北缘新生代期地壳加厚、隆升的重要动力因素更多还原

【Abstract】 Results from deep seismic reflection profiling,broadband deep seismic sounding and wide-angle reflection-refraction profiling,combined with surface geological observations ,petrological,mineralogical and geochemical studies and elastic model calculation,question the currently prevalent "two-sided subduction model"which suggests that the crustal thickening and uplift of the Qinghai-Tibet Plateau resulted from the southward A-subduction of the northern margin of the plateau and the northward subduction of its southern margin.The authors think that no long-distance subduction took place at least between the West Kunlun and Tarim(the Eurasian plate)on the northern margin of the plateau.Tarim only played a cer-tain role in resisting the pressure from the south since the Cenozoic and there a N-S compressional stress appeared.Therefore the continent-continent collisional orogeny and formation of the basin-and-range structure were controlled by the"oppositely directed N-S compression model",and the N-S compression in opposite directions is also an important dynamic factor for the crustal thickening and uplift on the northwestern margin of the plateau in the late Cenozoic.更多还原