榆木山北缘断裂现今构造活动特征及其对青藏高原北东扩展的构造地貌响应
发布时间：2019-06-26 15:05
【摘要】：榆木山北缘断裂位于祁连山逆冲断裂带中部,是榆木山隆起与河西走廊之间的分界断裂。探究榆木山北缘断裂的构造活动,有助于进一步了解祁连山向N的扩展过程以及青藏高原向NE方向推挤的机制。文中主要从断层滑动速率、古地震活动习性和构造变形3个方面总结了榆木山地区近20多年以来的研究成果。通过遥感影像解译、野外地质调查、断错位移测量及地貌面年龄测定等方法和手段,估算了榆木山北缘断裂典型位错点的逆冲滑动速率为(0.55±0.15)mm/a;左旋滑动速率为(0.95±0.11)mm/a。认为前人提出的"骆驼城陡坎"并非断层活动的产物,而是古代引水工程或水利灌溉工程的遗迹,也就是说它不是公元180年表氏地震的地表破裂。通过DEM剖面所反映的山体形态,结合断裂各项特征,认为榆木山隆起是祁连山向N推挤的结果,断裂活动目前仍集中在榆木山北侧,山体的形态受断层扩展控制,山脉的扩展是1个垂向和侧向的过程,晚新生代以来榆木山持续隆升。
[Abstract]:The northern margin of Yumushan fault is located in the middle of Qilian Mountain thrust fault zone and is a boundary fault between Yumushan uplift and Hexi corridor. To explore the tectonic activity of the fault in the northern margin of Yumushan is helpful to further understand the extension process of the Qilian Mountains to N and the mechanism of the Qinghai-Xizang Plateau pushing in the direction of NE. In this paper, the research results in Yumushan area in recent 20 years are summarized from three aspects: fault slip rate, paleoseismic activity habits and structural deformation. By means of remote sensing image interpretation, field geological survey, fault dislocation displacement survey and geomorphological surface age determination, the thrust slip rate of typical dislocation points in the northern margin of Yumushan fault is estimated to be (0.55 卤0.15) mm/a; and (0.95 卤0.11) mm/a.. It is considered that the "camel city steep ridge" proposed by predecessors is not the product of fault activity, but the relic of ancient water diversion project or water conservancy and irrigation project, that is to say, it is not the surface rupture of the 180 AD Bei earthquake. Through the shape of mountain body reflected in DEM section and the characteristics of faults, it is considered that the Yumushan uplift is the result of N push and extrusion in Qilian Mountains, and the fault activity is still concentrated on the north side of Yumushan Mountains. The shape of the mountain body is controlled by fault expansion. The mountain range expansion is a vertical and lateral process. Yumushan uplift has continued to rise since the late Cenozoic.
【作者单位】： 中国地震局地质研究所地震动力学国家重点实验室;中山大学地球科学与工程学院广东省地球动力作用与地质灾害重点实验室;中国科学院地球环境研究所;牛津大学地球科学系;中国地震局兰州地震研究所;
【基金】：国家自然科学基金(41590861,41372220,41172194) 公益性行业科研专项经费项目(201408023)共同资助
【分类号】：P315.2
本文编号：2506273
[Abstract]:The northern margin of Yumushan fault is located in the middle of Qilian Mountain thrust fault zone and is a boundary fault between Yumushan uplift and Hexi corridor. To explore the tectonic activity of the fault in the northern margin of Yumushan is helpful to further understand the extension process of the Qilian Mountains to N and the mechanism of the Qinghai-Xizang Plateau pushing in the direction of NE. In this paper, the research results in Yumushan area in recent 20 years are summarized from three aspects: fault slip rate, paleoseismic activity habits and structural deformation. By means of remote sensing image interpretation, field geological survey, fault dislocation displacement survey and geomorphological surface age determination, the thrust slip rate of typical dislocation points in the northern margin of Yumushan fault is estimated to be (0.55 卤0.15) mm/a; and (0.95 卤0.11) mm/a.. It is considered that the "camel city steep ridge" proposed by predecessors is not the product of fault activity, but the relic of ancient water diversion project or water conservancy and irrigation project, that is to say, it is not the surface rupture of the 180 AD Bei earthquake. Through the shape of mountain body reflected in DEM section and the characteristics of faults, it is considered that the Yumushan uplift is the result of N push and extrusion in Qilian Mountains, and the fault activity is still concentrated on the north side of Yumushan Mountains. The shape of the mountain body is controlled by fault expansion. The mountain range expansion is a vertical and lateral process. Yumushan uplift has continued to rise since the late Cenozoic.
【作者单位】： 中国地震局地质研究所地震动力学国家重点实验室;中山大学地球科学与工程学院广东省地球动力作用与地质灾害重点实验室;中国科学院地球环境研究所;牛津大学地球科学系;中国地震局兰州地震研究所;
【基金】：国家自然科学基金(41590861,41372220,41172194) 公益性行业科研专项经费项目(201408023)共同资助
【分类号】：P315.2
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