中新生代库车-南天山盆山系统隆升历史的裂变径迹证据

Mesozoic and Cenozoic uplifting history of the Kuqa-South Tianshan Basin-Mountain System from the evidence of apatite fission track analysis

通过对库车河剖面中新生界砂岩中碎屑磷灰石裂变径迹分析测试，得出磷灰石样品可分为3组，分别反映库车盆地边缘或其物源区天山的剥露冷却。对测试数据分析和热史模拟表明，南天山及库车盆地在中新生代经历了3次主要隆升事件，且山盆隆升时间上具有差异性的特点。从142Ma南天山开始隆升，使天山地区从准平原化状态开始盆山分异；96～75Ma为晚白垩世开始的盆地与天山共同经历的区域性隆升；54～30Ma为天山与盆地边缘差异隆升阶段，是盆山边界处盆地基底向天山方向的阶梯式抬升所导致的。

A fission track analysis of apatite samples from Cenozoic sandstone near the Kuqa River shows that these samples can be divided into 3 groups, which display the exhumation and cooling of the margin of the Kuqa Basin or the Tianshan Mountains. Based on experimental data and thermal history modeling, it is concluded that the South Tianshan and Kuqa Basin experienced three major uplifting events. The South Tianshan began to uplift at 142 Ma, causing differentiation between the basin and the mountain. The uplifting in 96--75 Ma was a regional event, during which the basin margin and the Tianshan uplifted together. The Tianshan and Kuqa Basin underwent differential uplifting during 54--30 Ma, resulting from ladder-like uplift of basin and mountain.