中文摘要：

以高分辨率磁性地层学为基础。精确地厘定了柴达木盆地西北缘红三旱剖面上、下干柴沟组沉积地层的时代、沉积速率。揭示出36Ma前后柴达木盆地经历了一次短暂的构造活动引起的沉积速率增大，与60～40Ma期间印度板块与欧亚大陆碰撞造成阿尔金断裂再次强烈活化。促使柴达木盆地西北缘山脉形成紧密相关。综合分析沉积物的岩相学、砂岩成分、稳定同住素等与始新统-渐新统界线全球变冷事件的相关性，表明该地区的沉积物记录了始新统-渐新统界线全球变冷事件。

英文摘要：

The ages and sedimentation rates of the Xiaganchaigou and Shangganchaigou formations in the Hongsanhan section at the northwestern margin of the Qaidam basin were determined by high-resolution magnetostratigraphy. The results revealed that increased sedimentation rates occurred around 36 Ma due to the influence of a short tectonic movement in the Qaidam basin. India-Eurasia collision at 60 - 40 Ma resulted in strong reactivation of the Altyn Tagh fault, which was closely related to the formation of mountains at the northwestern margin of the Qaidam basin. The correlation between the Eocene-Oligocene boundary global cooling event and information of the detailed lithofacies, sandstone composition and stable isotopes of the sediments in this section suggests that the sediments in the area record this Eocene-Oligocene boundary global cooling event.