中文摘要：

天山造山带新生代剥露过程一直受到普遍关注。对沿横穿天山的乌鲁木齐-库尔勒公路胜利达坂以南段采集的基岩样品进行了详细的磷灰石裂变径迹分析。热史模拟结果显示,该段天山的新生代剥露历史分为两个阶段,即古近纪期间的缓慢剥露阶段和中新世以来的快速剥露阶段,其剥露速率分别为〈30m/Ma和70~160m/Ma。综合分析前人在东天山、北天山以及南天山等天山不同区域取得的低温热年代学数据,我们认为,新生代天山造山带可能经历了4次快速剥露过程,分别开始于新生代早期（67~65Ma）、始新世中期（约 40±5Ma）、渐新世末-中新世中期（约 20±5Ma）以及中新世中晚期（约 10±2Ma）。这4次快速剥露过程分别发生于造山带的某一或某些区域,表明新生代天山地区的剥露过程存在明显的空间差异性。从整个天山造山带来看,渐新世末-中新世中期开始的快速剥露影响范围可能最广,是新生代天山地区一次重要的剥露作用过程。

英文摘要：

In response to the India-Asia collision during Cenozoic times,the Tian Shan range has been tectonically reactivated and intensely uplifted.Many previous studies have focused on the history of uplift and exhumation of the Tian Shan during the Cenozoic based on low-temperature thermochronology,magnetostratigraphy and syntectonic deposits,sedimentology,and rock magnetism.However,the divergent opinions still exist.Here we also employ apatite fission-track analysis on rock samples from a transect along the Vrümqi-Korla road crossing the eastern part of the Tian Shan in order to better understand the spatial difference in the exhumation history of the Tian Shan range.In the field,we selected sixteen rock samples（WK1~WK16）along the Road.The samples WK6~WK10 and WK12~WK15 were performed for all the analytical procedures of apatite fission track,which were mainly from the segment of the Road south of Shenglidaban.The other samples（WK1~WK5,WK11,and WK16）were not further analyzed due to the following reasons：（1）there are not enough apatite grains for sample preparation,or（2）there is any suitable apatite grains for fission track statistics.In the lab,we obtained the AFT data such as confined track length,Dpar（diameter of etched spontaneous fission tracks measured parallel to the crystallographic C-axis）,track angle to the crystallographic C-axis.Our fission-track data show that confined track length ranges from 12.8~14.1μm with standard deviation of 1.41~1.75μm,and that Dpar is 1.57μm to 2.03μm.AFT ages span 90~50Ma except for sample WK6 with the age of ca.158Ma.The positive correlation exists between these AFT age data and the corresponding elevations.The thermal modeling results show that the sampled part of the Tian Shan range has experienced two stages of exhumation during Cenozoic times,i.e. ,slow exhumation before ca.20±5Ma followed by subsequent rapid exhumation,with the exhumation rates of ca.10~30m/Ma and ca.70~160m/Ma,respectively.Together with the previous low-temperature thermochronolo