论文部分内容阅读
利用中法合作布设在藏南 51个临时地震台记录的数据进行的层析反演结果表明 :印度板块整体仅俯冲到特提斯喜马拉雅之下 ,在嘎拉附近俯冲角度变陡并向下延伸到 150km ,然后逐渐变平 ,俯冲前沿限制在雅鲁藏布江缝合线以南 .对应康马、冈底斯岩体以及羊八井_当雄裂谷下方的岩石圈中部表现为低速特征 ,它们可能是高温和局部熔融的反映 .该结果有力说明自印度板块和欧亚板块碰撞后 ,陆_陆俯冲仅发生在雅鲁藏布江缝合线以南的喜马拉雅地体之下 ,高原腹地的地壳缩短和增厚是通过陆内变形完成的
The tomographic inversion using the data recorded by the 51 temporary seismostats deployed by China-France cooperation shows that the Indian plate as a whole only subducted beneath the Tethyan Himalayas, and the subduction angle steep and downward extended near Gala To 150km and then gradually flatten out and the subduction frontier is confined to the south of the Yarlung Zangbo suture.The central lithosphere corresponding to the Kangma and Gangdese plutons and the Yangbajing-Dangxiong rift shows low-speed characteristics, which may be high temperature And local melting.The results strongly suggest that after the collision between Indian plate and Eurasian plate, the continental-continental subduction occurred only under the Himalayan terrane south of the Brahmaputra suture, and the crustal shortening and thickening in the hinterland of the plateau were controlled by the continental Within the deformation is completed