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甘肃张掖长石梯沟—西流水河断层晚第四纪以来的活动特征

Activity features of the changshitigouxi(?)iushuihe fault since late quaternary
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摘要 一、前言长石梯沟—西流水河断层(以下简称长—西断层)位于甘肃省张掖盆地西南80余公里,榆树山活动断层之南,同属祁连山北缘断裂的组成部分。长—西断层北西起黄羊大沟,向南东经长石梯沟、黑河、西流水河、黑石头沟、大野口水库到柳谷城南消失,在黑石头沟附近断层呈右阶错列,航、卫片上线性影像清晰。断层走向N40°~45°W,倾向NE,倾角65°;在大野口水库断裂走向N40°W,倾向SW,倾角50°。 New results of field investigations show that the Changshitigou-Xiliushuihe fault is an active reverse fault in late Quaternary.The fault can be divided into two segments in the light of its strikes,active ages and natures.The Heishitougou to Dayekougou segment in the southeast is dominated by left lateral strike-slip displacement since late Pleistocene,while the Huangyangdagou to Heishitougou segment in the northwest are characterized by thrust movement since later Pleistocene to Holocene.The average slip rate of the Huangyangdagou to Heishitougou segment in the northwest is 1.6mm/a in late Pleistocene,1.8 to1.9mm/a in Holocene,and the average vertical slip rate is 0.31mm/a in late Pleistocene and Holocene.The average slip rate in the Heishitougou to Dayekougou segment in the southeast is 1.7mm/a,and the vertical slip rate is 0.2mm/a in late Pleistocene.The activity of the southeast segment in Holocene is not obvious.
作者 侯治华 马保起 舒赛兵 付瑶 HouZhihua;MaBaoqi;ShuSaibin;FuYao(Institute of Crystal Dynamics,CSB,Bejing,100085;Xiaogushan Water and Electric Co.Ltd.,Zhangyic,Gangsu province,73400)
出处 《地壳构造与地壳应力文集》 2004年第1期38-46,共9页 Bulletin of the Institute of Crustal Dynamics
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