中文摘要：

喀喇昆仑断裂的变形特征、形成时代、构造演化以及它的构造意义一直存在着争议。在喀喇昆仑断裂东南段阿伊拉日居山地区，沿断裂出露具右旋剪切应变的糜棱岩和糜棱岩化片麻岩-花岗岩，显微构造研究表明其存在高温右旋剪切变形特征，并伴随淡色同构造花岗岩的产生，同构造结晶锆石所记录的U-Pb同位素年龄，暗示了喀喇昆仑断裂的形成时代在23-25Ma以前，其连续变形作用持续到-12／Via，之后伴随阿伊拉日居山的快速隆升以及噶尔盆地开始形成。综合分析表明喀喇昆仑断裂生长过程可能是由南东向北西扩展的过程，是印度板块与欧亚大陆持续碰撞的结果。断裂的累积位移量至少为280km，其长期平均滑移速率约为11mm／a。通过块体间运动学分析，表明在-23-25／Ma以后青藏高原物质以约16．2mm／a的速率向-N108°方向挤出。

英文摘要：

The deformation features, age, tectonic evolution and tectonic role of the Karakorum fault （KF） have long been controversial. In the Ayila Ri＇gyü area in the southeastem segment of the KF, dextral sheared mylonite and mylonitized gneiss-granite are exposed along the fault. Microstructural study indicates high-temperature, dextral shear features, accompanied by the generation of synkinematic leucogranite. The U-Pb ages recorded by synlcinematic crystalline zircons imply that：the KF formed at least before 23-25 Ma and its continuous deformation at least continued to -12 Ma, when the deformation was accompanied by rapid uplift of the Ayila Ri＇gyü Range and initiation of the Gar basin. Integrated analysis indicates that the growth process of the KF might be a process of northwest-directed propagation and the result of continuous India-Eurasia collision. The cumulative displacement amount is at least 280 km along the fauk, and an average long-term slip rate is -11 mm/a on the fault. Rigid block kinematic analysis suggests that material of the Qinghai-Tibet Plateau was extruded toward - 108°N at a rate of 16.2 mm/a after -23-25 Ma.