阿尔金断裂花海段新生代变形特征及时间
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摘要
在地表地质调查并结合钻井资料分析的基础上,主要通过地震剖面的精细地质解释,对阿尔金断裂东段的构造变形特征进行了系统分析。认为阿尔金断裂经阿克塞至肃北向北东东方向延伸,既没有止于玉门市西北的宽台山,也没有延伸至金塔盆地,而是止于其间的花海盆地花探7井东侧。阿尔金断裂花海段的变形时间主要为渐新世晚期、上新世末期和晚更新世末,以后者最为强烈。与红柳峡段的对比说明变形强度自西向东逐渐减弱,变形方式主要为走滑兼逆冲,主要构造样式为半花状构造,并派生有一系列向南西西方向收敛的弧形断裂。
Based on the seismic profile interpretation as well as ground survey and well data, the paper presented structural deformation features of the eastern sector of Altun fault. It extended NEE-wards from Akesai to northern Gansu, and did not terminate in the Jinta Basin or the Kuantaishan mountains to the northwest of Yumen city. Actually, it ended at the east of the Well Huatan 7 in the Huahai Basin, a Meso-Cenozoic basin located between the Kuantaishan mountains and the Jinta Basin. The structural deformation of the eastern sector of Altun fault occurred mainly in three periods: Late Oligocene, end of Pliocene and end of Late Pleistocene, with the later being most violent one. Spacially, the deformation became weakened from the west to the east. The deformational mode might be strike-slipping with thrusting, which gave rise to a group of thrusts which made up an arcuate fracture system disappeared SWW-wards, with a main tectonic style being a half-flower structure in profile.
Based on the seismic profile interpretation as well as ground survey and well data, the paper presented structural deformation features of the eastern sector of Altun fault. It extended NEE-wards from Akesai to northern Gansu, and did not terminate in the Jinta Basin or the Kuantaishan mountains to the northwest of Yumen city. Actually, it ended at the east of the Well Huatan 7 in the Huahai Basin, a Meso-Cenozoic basin located between the Kuantaishan mountains and the Jinta Basin. The structural deformation of the eastern sector of Altun fault occurred mainly in three periods: Late Oligocene, end of Pliocene and end of Late Pleistocene, with the later being most violent one. Spacially, the deformation became weakened from the west to the east. The deformational mode might be strike-slipping with thrusting, which gave rise to a group of thrusts which made up an arcuate fracture system disappeared SWW-wards, with a main tectonic style being a half-flower structure in profile.
引文
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王燮培,费琦.1990.石油勘探构造分析.武汉:中国地质大学出版社.52—165.Wang Xiepei and Fei Qi.1990.Structural Analysis of Petroleum Exploration.Wuhan:China University of Geosciences Press.52—165.
徐锡伟,Tapponnier P,Van Der Woerd J,Ryerson F J,王峰,郑荣章,陈文彬,马文涛,于贵华,陈桂华.2003.阿尔金断裂带晚第四纪左旋走滑速率及其构造运动转换模式探讨.中国科学D辑,33(10):967—974.Xu Xiwei,Tapponnier P,Van Der Woerd J,Ryerson F J,Wang Feng,Zheng Rongzhang,Chen Wenbin,Ma Wentao,YuGuihua and Chen Guihua.2003.Sinistral strike slip rate of the Altyn Tagh fault since Late Quaternary and its movement tran-sition model.Science in China,Series D,33(10):967—974.
郑剑东.1991.阿尔金断裂的几何学研究.中国区域地质,(1):54—59.Zheng Jiandong.1991.Geometry of the Altun fracture zone.Regional Geology ofChina,(1):54—59.
Cowgill E,Yin A,Wang Xiaofeng and Zhang Qing.2000.Is the North Altyn Tagh fault part of a strike-slip duplex along theAltyn Tagh fault system?Geology,28(3):255—258.
Ding Guoyu,Chen Jie,Tian Qinjian,Shen Xuhui,Xing Chengqi and Wei Kaibo.2004.Active faults and magnitudes of left-lateral displacement along the northern margin of the Tibetan Plateau.Tectonophysics,380:243—260.
崔军文,唐哲民,邓晋福,岳永君,孟令顺,余钦范,李冀湘,赖绍聪,齐立,郭耕成,卢德源,朱红.1999.阿尔金断裂系.北京:地质出版社.99—153.Cui Junwen,Tang Zhemin,Deng Jinfu,Yue Yongjun,Meng Lingshun,Yu Qinfan,Li Jixiang,Lai Shaocong,Qi Li,GuoGengcheng,Lu Deyuan and Zhu Hong.1999.The Altun Fault Zone.Beijing:Geological Publ.House.99—153.
丁国瑜.1995.阿尔金活断层的古地震与分段.第四纪研究,(2):97—106.Ding Guoyu.1995.Paleoearthquakes along the Altun active fault and its segmentation.Quaternary Sciences,(2):97—106.
国家地震局阿尔金活动断裂带课题组.1992.阿尔金活动断裂带.北京:地震出版社.108—115.The Research Group of the Altun Fault Zone,State Seismological Bureau.1992.The Active Altun Fault Zone.Beijing:Seis-mological Press.108—115.
李百祥.1990.阿尔金断裂带东北段地球物理场特征分析——兼与李占奎同志商榷真正的阿尔金断裂.甘肃地质,(11):36—42.Li Baixiang.1990.Character analysis of geophysical field in northeast section of Aerjin fault zone——Discussion“real Aerjinfault”with comrade Li Zhankui.Gansu Geology,(11):36—42.
柳祖汉,吴根耀,杨孟达,郭泽清,温志峰.2006.柴达木盆地西部新生代沉积特征及其对阿尔金断裂走滑活动的响应.地质科学,41(2):344—354.Liu Zuhan,Wu Genyao,Yang Mengda,Guo Zeqing and Wen Zhifeng.2006.Sedimentary features of the Cenozoic in thewestern Qaidam Basin:response to strike-slippng of the Altun fault.Chinese Jour.Geol.,41(2):344—354.
王燮培,费琦.1990.石油勘探构造分析.武汉:中国地质大学出版社.52—165.Wang Xiepei and Fei Qi.1990.Structural Analysis of Petroleum Exploration.Wuhan:China University of Geosciences Press.52—165.
徐锡伟,Tapponnier P,Van Der Woerd J,Ryerson F J,王峰,郑荣章,陈文彬,马文涛,于贵华,陈桂华.2003.阿尔金断裂带晚第四纪左旋走滑速率及其构造运动转换模式探讨.中国科学D辑,33(10):967—974.Xu Xiwei,Tapponnier P,Van Der Woerd J,Ryerson F J,Wang Feng,Zheng Rongzhang,Chen Wenbin,Ma Wentao,YuGuihua and Chen Guihua.2003.Sinistral strike slip rate of the Altyn Tagh fault since Late Quaternary and its movement tran-sition model.Science in China,Series D,33(10):967—974.
郑剑东.1991.阿尔金断裂的几何学研究.中国区域地质,(1):54—59.Zheng Jiandong.1991.Geometry of the Altun fracture zone.Regional Geology ofChina,(1):54—59.
Cowgill E,Yin A,Wang Xiaofeng and Zhang Qing.2000.Is the North Altyn Tagh fault part of a strike-slip duplex along theAltyn Tagh fault system?Geology,28(3):255—258.
Ding Guoyu,Chen Jie,Tian Qinjian,Shen Xuhui,Xing Chengqi and Wei Kaibo.2004.Active faults and magnitudes of left-lateral displacement along the northern margin of the Tibetan Plateau.Tectonophysics,380:243—260.
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