嘉峪关断裂晚第四纪新构造活动特征
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摘要
嘉峪关活动断裂位于嘉峪关市,是与河西走廊中3个斜向隆起之一的嘉峪关-文殊山隆起密切相关的活动断裂,也是祁连山北缘-河西走廊活动断裂体系的组成部分。该断裂走向320°,呈线状延伸;断裂切错前白垩系、白垩系、新近系和上更新统;在剖面上断裂表现为南西盘上升、北东盘下降,平面上表现为明显的右行走滑运动。晚更新世晚期~全新世存在5期明显的新构造活动,分别发生于距今稍大于4.3ka、稍大于12.9ka、20.0~23.2ka、35.5~45ka和稍大于58.1ka。断裂粘滑活动为主,并具明显古地震特点。
The Jiayuguan active fault is situated near Jiayuguan City.It is closely related to the Jiayuguan-Wenshushan uplift(which is one of the three uplifts in the Hexi Corridor: the Jiayuguan-Wenshushan uplift in the western part of the Hexi Corridor,Yumushan uplift in the central part of the Hexi Corridor and Dahuangshan uplift in the eastern part of the Hexi Corridor) and is also a component part of the northern Qilian marginal-Hexi Corridor active fault system.The fault strikes N320°W and extends linearly for 20 km.It cuts the pre-Cretaceous, Cretaceous,Neogene and upper Pleistocene.In section,the southwestern block of the fault moves up,while the northeastern block moves down;in plan,it is marked by apparent right-lateral strike-slip motion.Five phases of neotectonic movement took place along the Jiayuguan fault during the latest Pleistocene to Holocene,i.e.at 4.3-4.5,12.9-14.0,20.0-23.2,35.5-45 and 58.1 ka BP.The faulting was dominated by stick-slip movement and shows the distinctive characteristics of paleoearthquakes.
The Jiayuguan active fault is situated near Jiayuguan City.It is closely related to the Jiayuguan-Wenshushan uplift(which is one of the three uplifts in the Hexi Corridor: the Jiayuguan-Wenshushan uplift in the western part of the Hexi Corridor,Yumushan uplift in the central part of the Hexi Corridor and Dahuangshan uplift in the eastern part of the Hexi Corridor) and is also a component part of the northern Qilian marginal-Hexi Corridor active fault system.The fault strikes N320°W and extends linearly for 20 km.It cuts the pre-Cretaceous, Cretaceous,Neogene and upper Pleistocene.In section,the southwestern block of the fault moves up,while the northeastern block moves down;in plan,it is marked by apparent right-lateral strike-slip motion.Five phases of neotectonic movement took place along the Jiayuguan fault during the latest Pleistocene to Holocene,i.e.at 4.3-4.5,12.9-14.0,20.0-23.2,35.5-45 and 58.1 ka BP.The faulting was dominated by stick-slip movement and shows the distinctive characteristics of paleoearthquakes.
引文
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[2]向宏发,虢顺民.河西走廊玉门-嘉峪关地区活动断裂的初步研究[A].现代地壳运动研究(5).北京:地震出版社,1990,139~145.
[3]虢顺民,向宏发,黄昭,等.祁连山-河西走廊断裂带与地震.中法合作活断层对比研究[C].北京:地震出版社,1993,94~102.
[4]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):27~34.
[5]陈文彬,刘百篪,徐锡伟,等.祁连山西段玉门断裂晚第四纪活动特征及相关问题的讨论[J].西北地震学报,1999,21(4):389~394.
[6]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.
[7]陈柏林,王春宇,刘建民,等.新民堡车站断裂新构造活动特征[J].地球学报,2006,27(6):515~524.
[8]国家地震局地质研究所,国家地震局兰州地震研究所.祁连山-河西走廊活动断裂系[M].北京:地震出版社,1993.
[9]国家地震局阿尔金活动断裂课题组.阿尔金活动断裂带[M].北京:地震出版社,1992.
[10]陈柏林,刘建民,刘建生,等.高台车站断裂全新世活动特征[J].地质学报,2006,80(4):497~507.
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