Abstract: Among the Altun Tectonic system,there are thrust faults and thrusting components in the Altun strike-slip fault zone. Being similar to the Altun strike-slip fault zone,the thrust fault can be divided into three segments. They are the western segment,middle segment and eastern segment. The western segment is from Ayinaike to the debouchment of the Cheerchenhe River. There is thrusting component on the southern marginal fault of Altun and there are small thrust faults in piedmont in the western segment and evidences are discovered that show the latest terraces and alluvial fan being affected by thrust activity. The middle segment is from the debouchment of Cheerchenhe River to Lapeiquan. There are large-scale thrust faults in the northern margin of Altun Mountains,and there is evidence to show the younger surface of landform displaced by the thrust activity of the middle segment. The eastern segment is from Lapeiquan to Kuantanshan. There is thrusting component on the northern marginal fault of Altun,and thrust faults are developed on the northern margin of Altun Mountains and pediment alluvial fan. From the middle and late Pleistocene to present,the thrust rate on the middle and eastern segments of thrust fault is less than 2mm/a. Since 16ka BP,the thrust rate in Jianggalasayi on the west of the middle segment is 0.33mm/ a,the thrust rate in Milanqiao on the middle part of fault is 1.42mm/a since 32ka BP. The thrust rate of the middle part is bigger than that of the western part. The biggest thrust rate of the eastern segment is at Tuanjiexiang near to the middle part,being 1.81mm/a. From the middle part to the eastern or western part,the thrust rate becomes smaller. At Liuchengzi of the western part,the thrust rate is 0.57mm/a since 72.36ka BP. While at Hongliugou of the eastern part,the thrust rate is only 0.05mm/a since 8.99ka BP.

Key words: thrust rate, thrust scarp, Altun Tectonic system

摘要： 在阿尔金构造系中,阿尔金走滑断裂具有逆冲分量。文中将阿尔金构造系的逆冲活动分为西、中、东3段描述。西段从阿依耐克至车尔臣河河口,阿尔金南缘断裂具有逆冲活动迹象,在山前发育了规模较小的逆冲断层,有较新的地貌面被错动;中段从车尔臣河河口至拉配泉一带,在阿尔金山北缘发育大规模的逆冲断层,有较新的地貌面被错动;东段从拉配泉至宽滩山,逆冲断层有2种形式,此段阿尔金北缘断裂有逆冲分量,同时在阿尔金山北缘及山前冲洪积扇上发育逆冲断裂。自晚更新世中晚期以来,中段及东段逆冲速率<2mm/a。中段西部江尕拉萨依地区自16kaBP以来逆冲速率约为0.33mm/a,中部米兰桥一带自32kaBP以来的逆冲速率约为1.42mm/a。东段最大的逆冲速率在近中部的团结乡,自约5.31kaBP以来达到约1.81mm/a,向东西两端有减小的趋势,在西部柳城子自约72.36kaBP以来的逆冲速率为0.57mm/a,而东端的红柳沟自约8.99kaBP以来仅为0.05mm/a。团结乡地区约自19kaBP以来,逆冲活动有增强的趋势。

关键词: 逆冲速率, 逆断层陡坎, 阿尔金构造系