西昆仑—塔里木—天山岩石圈深地震探测综述

Summary of deep seismic probing of the lithospheric structure across the West Kunlun-Tarim-Tianshan

沿新疆地学断面走廊域实施了3种深地震探测方法:近垂直深地震反射剖面、宽角反射与折射深地震测深剖面和移动式宽频地震观测,揭露出西昆仑—塔里木—天山岩石圈的结构与横向变化,发现了塔里木大陆地块与青藏高原西北部西昆仑造山带碰撞的地震学证据,揭示出天山与塔里木、天山与准噶尔,以及昆仑山与塔里木之间的岩石圈尺度盆山耦合关系。阶段成果发表后引起国内外学者广泛注意,本文结合相关资料对这些新成果进行了系统综述,旨在对比研究青藏高原南北两缘不同的碰撞变形之深部过程。

Three kinds of deep seismic probing,near-vertical reflections ,refraction and wide-angle reflec-tions and broadband seismic observations ,have been carried out along the corridor of the Xinjiang geo-science transect.They have revealed the lithospheric structure and lateral variations across the West Kunlun orogen-Tarim block-Tianshan orogen.Seismic evidence of collision between the Tarim block and West Kunlun orogen on the northwestern Qinghai-Tibet plateau has been found and the basin-and-range cou-pling relationships between the Tarim basin and Tianshan,the Tianshan and Junggar basin,the West Kun-lun and Tarim basin at the lithospheric scale have been revealed too.Comparative study shows that the deep process of the collision and deformation on the northern margin of the Qinghai-Tibetan plateau is different from that on its southern margin.