新疆阿克苏大石峡水电站附近活动断层的基本特征
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摘要
通过对大石峡水电站附近的多条活动断层研究表明:库车坳陷西段的乌什坳陷区内,主要发育有两排新隆起的活动褶皱,由北向南依次为沙依拉木背斜带和苏尔滚背斜带;区内的活动断层主要以NE向为主,其中较大的断层有阔克沙勒断层、迈丹—沙依拉木断层和库齐隐伏断层。研究区中对场地影响较大的断层为迈丹—沙依拉木断层和大石峡口山前断层,它们均表现为东西分段特性,断层整体活动程度西强东弱。库齐隐伏断层是一条晚更新世末期的活动断层,最新的活动时代为距今1.4万年左右。
By studying many active faults near big Shixia hydroelectric installation,we though that Wushi sunken area in west of Kuche develops mainly active pleat which two rows new upheaval.From north to south,it is in turn Samula and Suergun anticline zones.The active fault in the area is mainly by NE.In them,the bigger faults are the Kuokeshale fault,Maidan-Shayilamu fault and Kuqi underlying fault.In the research area,the bigger fault which influenced for site is Maidan-Shayilamu fault and the fault in front of mountain near big Shixia.They both display the partition characteristic from east to west.The whole active intensity of faults shows that the west is strong while the east is weak.It is consistent with the result which the predecessor got.That is,they thought that the whole active of Tianshan mountain structures is weak gradually from west to east.Kuqi underlying fault is a late epipleistocene last stage active fault.And the newest active time was about 14,000 years apart from now.
By studying many active faults near big Shixia hydroelectric installation,we though that Wushi sunken area in west of Kuche develops mainly active pleat which two rows new upheaval.From north to south,it is in turn Samula and Suergun anticline zones.The active fault in the area is mainly by NE.In them,the bigger faults are the Kuokeshale fault,Maidan-Shayilamu fault and Kuqi underlying fault.In the research area,the bigger fault which influenced for site is Maidan-Shayilamu fault and the fault in front of mountain near big Shixia.They both display the partition characteristic from east to west.The whole active intensity of faults shows that the west is strong while the east is weak.It is consistent with the result which the predecessor got.That is,they thought that the whole active of Tianshan mountain structures is weak gradually from west to east.Kuqi underlying fault is a late epipleistocene last stage active fault.And the newest active time was about 14,000 years apart from now.
引文
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[2]Allen M B,Vincent S J,wheeler P J.Late Cenozoic tectonics of the Kepingtage thrust zone:Interaction between Tien Shanand Tarim Basin,northwest China[J].Tectonics,1999,18:639-654.
[3]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.
[4]汪新,Aurelia Hubert-Ferrari,John Supper.晚更新世以来南天山阿克苏地区地壳缩短速率[J].地质科学,2001,36(2):195-202.
[5]杨晓平,周本刚,李军,等.新疆南天山亚肯背斜晚更新世以来的隆起和缩短[J].地震地质,2001,23(4):501-509.
[6]刘杰,曲国胜,童晓光,等.库车坳陷深部构造变形与地震关系浅析[J].地震地质,2004,26(2):236-247.
[7]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.
[8]新疆维吾尔自治区地震局乌什地震工作队.1987年1月24日乌什6.4级地震[J].内陆地震,1987,1(2):131-132.
[9]邓起东,冯先岳,张培霞,等.天山活动构造[M].北京:地震出版社,2000.
[10]Aurac J P,Tapponnier P,Bai M,et al.Active thrusting and folding along the northern Tien Shan and late Cenozoic rotationof the Tarim relative to Dzungaria and Kazakhstan Jour[J].Geophysics Review,1993,98:791-808.
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