柴达木盆地北部碰撞构造与盆地改造变形

COLLISIONAL STRUCTURES AND BASINAL DEFORMATION IN THE NORTH QAIDAM BASIN

印度板块与亚洲板块在渐新世和中、上新世发生碰撞及持续的榨挤作用 ,所产生的远程效应 ,使南祁连造山带的逆冲岩席向柴达木盆地北缘逆冲推覆。在柴达木北部中、新生代盆地发生了二个世代的改造变形。从赛什腾—尕丘前渊断陷带的叠瓦状冲断层与断弯褶皱构造组合 ,到昆特依斜坡坳陷带的犁式逆掩断层与断展褶皱组合 ,直至鄂博梁—伊北一带的滑脱断层与滑脱褶皱构造组合 。

As a result of the collision of Indian plate and Asian plate during the Oligocene and the Miocene Pliocene and the continuing squeezing, the thrust sheets of the South Qilan Orogenic Belt advanced to the northern margin of the Qaidam Basin. The Meso Cenozoic basin in the North Qaidam underwent two generations of deformation. It was characterized by progressive deformation from the imbricate thrust and fault folded structures in the Saishenteng Gaqiu Frontal Faulted Zone to the listric thrust fault and fault folded structures in the Kunteyi Slope Depression Zone, and then to the decollement fault and fold structures in the Eboliang Yibei area.