酒泉盆地北侧金塔南山北缘断裂西段全新世活动特征
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摘要
金塔南山北缘断裂是酒泉盆地北侧的一条重要的活动断裂,断裂西起梧桐墩西北,向东经长山、瓜勾山、鸳鸯池水库、大口子山到红墩以西,长约60km,走向近东西,倾向北或南,倾角60°～80°。断裂活动方式以挤压逆冲为主,兼有左旋走滑特征。通过对现场断错地貌的调查和探槽开挖,发现金塔南山北缘断裂西段晚第四纪活动强烈,并有古地震发生。
Jintananshan north-margin fault is an important active fault at the north of Jiuquan Basin.The fault starts from the northwest of Wutongdun in the west,then passes through Changshan,Guagoushan,Yuanyangchishuiku,Dakouzi,and ends in the east of Hongdun.The main trending is near EW with length 60 km,dip is south or north,and the dip angle is 60~80 degree.The active manner of the fault is mainly thrust with left-lateral strike-slip features.According to field geomorphic investigation and trench excavation,we found strong active evidence at the west segment of the Jintananshan north-margin fault.Paleo-earthquakes have also be found there.
Jintananshan north-margin fault is an important active fault at the north of Jiuquan Basin.The fault starts from the northwest of Wutongdun in the west,then passes through Changshan,Guagoushan,Yuanyangchishuiku,Dakouzi,and ends in the east of Hongdun.The main trending is near EW with length 60 km,dip is south or north,and the dip angle is 60~80 degree.The active manner of the fault is mainly thrust with left-lateral strike-slip features.According to field geomorphic investigation and trench excavation,we found strong active evidence at the west segment of the Jintananshan north-margin fault.Paleo-earthquakes have also be found there.
引文
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[2]Hetzel R,Tao M,Niedermann S,et al.Implications of the fault scaling law for the growth of to-pography:Mountain ranges in the broken foreland of NE Tibet[J].Terra Nova,2004,16:157-162.
[3]Hetzel R,Mingxin Tao,Stephen Stokes,et al.Late Pleistocene//Holocene slip rate of the Zhangyethrust(Qilian Shan,China)and implications for the active growth of the northeastern Tibetan Plat-eau[J].TECTONICS,2004,23:6 006-6 023.
[4]陈柏林,王春宇,崔玲玲.河西走廊西段南北向左行逆冲活动断裂的发现及其意义[J].地质学报,2009,83(7):937-945.
[5]何文贵,雷中生,袁道阳,等.1785年玉门惠回堡地震的震灾特点与发震构造[J].西北地震学报,2010,32(1):47-53.
[6]何文贵,赵广堃,马尔曼,等.2002年甘肃玉门5.9级地震的地质背景研究[J].地震研究,2004,27(4):363-368.
[7]何文贵,袁道阳,王爱国,等.嘉峪关断层中段的新活动特征[J].中国地震,2010,26(3):296-303.
[8]陈柏林,刘建民,刘建生,等.阴洼山断裂全新世活动特征与年代学研究[J].地震地质,2005,27(2):243-251.
[9]闵伟,张培震,何文贵,等.酒西盆地断层活动特征及古地震研究[J].地震地质,2002,24(1):35-43.
[10]王金荣,翟新伟,王廷印,等.甘肃金塔南山构造变形及其地质意义[J].兰州大学学报,2002,38(1):122-126.
[11]郑文俊.河西走廊及其邻区活动构造图像及构造变形模式[D].北京:中国地震局地质研究所,2009.
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