北天山西段库松木楔克山山前断层新活动特征初探
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摘要
库松木楔克山山前断层是位于北天山西段再生造山带北缘一条重要的边界断层,是本次新发现和确定的一条活动断层。断层分为东、中、西三段:东段主要由4条断层斜列组合而成,单条断层长度为9~13 km,在晚更新世~全新世仍在强烈活动,晚更新世以来的垂直错动量为3~4 m,垂直活动速率为0.23~0.33 mm/a,全新世以来的垂直错动量为0.5~0.8 m;中段断层活动错断了中更新世至全新世地貌,形成多级断层陡坎和长约8~10 km的地震形变带,晚更新世以来垂直活动速率为0.5 mm/a;西段自晚更新以来无活动显示。
Kusongmuxieke mountain front fault is one of important border faults of the north fringe of rejuvenated orogenic belt in west segment of north Tianshan,it is found and determined in our research that it is an active fault.The fault can be divided into three segments.The east segment mainly consists of four en echelon faults with length of 9~13 km,and still moves intensively in Later Pleistocene and Holocene Epoch.Since Later Pleistocene,vertical slippage of single fault has been 3～4 m,vertical active rate is 0.23～0.33 mm/a,and vertical slippage of single fault is 0.5～0.8 m since Holocene Epoch.New movement of the middle segment dislocates different geomorphologic units which formed from Middle Pleistocene to Holocene Epoch,forms multilevel fault escarpments and a 8～10 km long earthquake deformation belt.Since Later Pleistocene the vertical active rate is 0.5 mm/a.The west segment has no movement since Later Pleistocene.
Kusongmuxieke mountain front fault is one of important border faults of the north fringe of rejuvenated orogenic belt in west segment of north Tianshan,it is found and determined in our research that it is an active fault.The fault can be divided into three segments.The east segment mainly consists of four en echelon faults with length of 9~13 km,and still moves intensively in Later Pleistocene and Holocene Epoch.Since Later Pleistocene,vertical slippage of single fault has been 3～4 m,vertical active rate is 0.23～0.33 mm/a,and vertical slippage of single fault is 0.5～0.8 m since Holocene Epoch.New movement of the middle segment dislocates different geomorphologic units which formed from Middle Pleistocene to Holocene Epoch,forms multilevel fault escarpments and a 8～10 km long earthquake deformation belt.Since Later Pleistocene the vertical active rate is 0.5 mm/a.The west segment has no movement since Later Pleistocene.
引文
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[17]邓起东、冯先岳、杨晓平,等.利用大型探槽研究新疆北天山玛纳斯和吐谷鲁逆断裂-褶皱带全新世古地震[A]∥活动断裂研究(3)[C].1994:1-17.
[2]Aurac J P,Tapponnier P.Bai M,et al.Active thrusting andfolding along the northern Tien Shan and late Cenozoic rota-tion of the Tarim relative to Dzungaria and Kazakhstan[J].Jour.Geophysics Review,1993,98:791-808.
[3]Handrix M S,Dum itru T A,Graham S A.Late Oligocene-early M iocene unroofing in the Chinese Tianshan:An earlyefect of the lndia-Asia collision[J].Geology,1994,22:487-490.
[4]Yin A.Nie S.Craig P,et a1.Late Cenozoic tectonic evolutionof the southern Chinese Tian Shah[J].Tectonics,l998,I7(1):1-27.
[5]Abdrakhmatov K A,Mazhanov S A,Hager B H,et a1.Rela-tively recent construction of the Tian shan inferred from GPSmeasurements of present-day crustal deform ation rates[J].Nature,1996,384:450-453.
[6]Mollnar P E,Brown P,Burchfiel B C,et al,Quaternary climatechange and the formation of river terraces across grouting anti-clines on the north flank of the Tialishan,China[J].Geology,1994,102:583-602.
[7]冯先岳,邓起东.石建邦等,天山南北缘活动构造及其演化[A]∥活动断裂研究(1)[C].北京:地震出版社,1991.
[8]张培震,邓起东,杨小平,等.天山的晚新生代构造变形及其地球动力学问题[J].中国地震,1996,12(2):127-140.
[9]杨晓平,冯先岳,等.北天山地区活动逆断裂-褶皱带构造与潜在震源区估计[J].地震地质,1998,20(3):193-200.
[10]Burchfiel BC,Brown E T,DENG Qi-dong,et al.Crustalshortening on the margins of Tian Shan,Xinjiang,China[J].Intern.Geol.,Review,1999,41:665-700.
[11]邓起东,冯先岳,张培震,等.天山活动构造[M].北京:地震出版社,2000.
[12]赵瑞斌,杨主恩,周伟新,等.天山南北两侧山前坳陷带中新生代构造特征与地震[J].地震地质,2000,22(3):295-304.
[13]沈军,赵瑞斌,李军,等.塔里木盆地西北缘河流阶地变形测量与地壳缩短速率[J].科学通报,2001,46(4):334-338.
[14]沈军,吴传勇,李军,等.库车坳陷活动构造的基本特征[J],地震地质,2006,28(2):269-278.
[15]吴传勇,沈军,陈建波,等.新疆南天山库车坳陷晚第四纪以来地壳缩短速率的初步研究[J],地震地质,2006,28(2):279-288.
[16]邓起东,冯先岳,尤惠川,等.新疆独山子-安集海活动逆断裂带晚第四纪活动特征及古地震[A]∥活动断裂研究(1)[C].1991:37-56.
[17]邓起东、冯先岳、杨晓平,等.利用大型探槽研究新疆北天山玛纳斯和吐谷鲁逆断裂-褶皱带全新世古地震[A]∥活动断裂研究(3)[C].1994:1-17.
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