中文摘要：

通过对阿尔金断裂带西段莫勒切河河口附近卫星影像解译、野外调查测量及地貌面样品年龄测定,利用宽谷阶地、堆积阶地获取构造隆升速率、构造变形方式及加积速率,并结合区域气候资料探讨该区阶地发育对气候变化的响应。莫勒切河出山口发育4级阶地（T4,T3,T2,T1）,其中T4、T3为宽谷阶地,T2为堆积阶地,T1为堆积-切割阶地。T3,T2,T1阶地形成年龄为分别为（18.98±1.42）kaBP、（13.08±1.01）kaBP、（5.72±0.43）kaBP,3级阶地分别形成于冰盛期末期、新仙女木时期以及5kaBP左右的变冷变干气候环境。T3揭示自（18.98±1.42）kaBP至今莫勒切河出山口的平均抬升速率为（6.66±0.50）mm/a。T3、T2阶地的存在揭示（18.98±1.42）kaBP至（13.08±1.01）kaBP之间,研究区及其邻近地区存在一轮快速的构造抬升和快速加积事件,抬升速率〉20mm/a,加积速率〉10mm/a。构造抬升形式为从南向北的跨阿尔金断裂带的掀斜式抬升,是高原向北扩展的一种运动形式。T2阶地的堆积应该是此次快速构造抬升和15kaBP至12kaBP之间冰消气候共同作用的产物。

英文摘要：

Based on the interpretation of satellite image,field investigation and geomorphic survey and sample dating of surface,the strath terrace and fill terrace at the outlet of Moleqiehe River on the western segment of Altyn Tagh Fault zone（ATF）are used to study the tectonic uplift rate,uplift model and aggradation rate,and cooperated with data of the regional climate,the response to climate evolution of development of terrace are discussed.The previous studies of the terraces related with the Altyn Tagh Fault zone are mainly focused on the horizontal offset in order to obtain sinistral-slip rate,but few studies involve the uplift using terraces.As a structural zone with strike-thrust characteristic,the ATF is a boundary structure of the northern fringe of Qinghai-Tibet Plateau,and its thrusting and uplifting movement is of significance for controlling the uplift of the northern fringe of the Plateau.Therefore,the study of uplift of the ATF will be helpful for understanding the uplift model and mechanism and promoting the kinematic study of the northern fringe of the Plateau.The formation of strath terrace is closely related with tectogenetic movement,the landform age of the terrace represents the starting time of uplift.Based on the height and strath and landform age,the uplift rate can be calculated.The fill terrace is formed by climate forcing,the surface age represents the end time of one aggradation event.If the starting time of aggradation is obtained,the aggration rate can be calculated.There are four stream terraces at the outlet of Moleqiehe River（T4,T3,T2,and T1）.T4 and T3 are strath terraces,T2 is fill terrace,and T1 are fill-cut terraces.The landform ages of T3,T2,and T1 are 18.98±1.42kaBP,13.08±1.01kaBP,and 5.72±0.43kaBP,respectively.The existence of T3 reveals the uplift rate of 6.66±0.50mm/a since 18.98±1.42kaBP.The existence of T3 and T2 reveals the time of fast uplift movement and aggradation events between 18.98±1.42kaBP to 13.08±1.01kaBP,the uplift rate is bigger than 20mm/a and the ag