LATE QUATERARY NEOTECTONIC MOVEMENT OF THE JIAYUGUAN FAULT
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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。Abstract: 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 JiayuguanWenshushan 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.
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Key words:
- neotectonic movement /
- late Quaterary /
- right-lateral strike-slip motion /
- Jiayuguan fault /
- Gansu
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图 1 嘉峪关断裂区域构造略图
Kz-新生界; Mz-中生界; AnM-前中生界; Mg-花岗岩; F1-阿尔金断裂带; F2-1-嘉峪关断裂; F2-2-文殊山断裂; F3-佛洞庙-红崖子断裂
Figure 1. Regional structural map of the Jiayuguan fault
图 2 嘉峪关断裂地质图(据1/20万地质图编制)
Qh-全新统; Qp3-上更新统; Qp2-中更新统; Qp1-下更新统; K1-下白垩统; Mg-花岗岩; AnK-前白垩系; 1-地质界线; 2-地层不整合界线; 3-逆冲断层; 4-其他及推测断层
Figure 2. Geological map of the Jiayuguan fault
图 3 嘉峪关活动断裂剖面图(XQ058)
Qh-全新统; Qp3(2)-上更新统上部; Qp3(1)-上更新统下部; N1-中新统; 1-黄土夹砂砾; 2-混乱断层楔堆积; 3-坡积砂砾夹再生红泥; 4-中粗砾石层; 5-泥岩夹砂岩; 6-断层; 7-热释光年龄和样品位置
Figure 3. Section of middle segment of Jiayuguan active fault
图 4 嘉峪关断裂剖面图(A-XQ73;B-XQ74)
Qh-全新统; Qp3(2)-上更新统上部; N1-中新统; 1-黄土夹砂砾; 2-中粗砾石层; 3-泥岩夹砂岩; 4-断层破碎带; 5-正断层; 6-节理裂隙带; 7-热释光年龄和样位
Figure 4. Section of the segment of Jiayuguan active fault
图 5 嘉峪关断裂北段剖面图(A-XQ122;B-XQ123)
Qp3(2)-上更新统上部; N1-中新统; 1-冲洪积碎石片层; 2-中细砂层; 3-中粗砾石层; 4-辉长岩; 5-正断层; 6-热释光年龄和样位
Figure 5. Section of northern segment of Jiayuguan active fault
图 6 嘉峪关断裂切错小冲沟素描图
Figure 6. Offset gully at Southern-middle segment of Jiayuguan active fault
表 1 嘉峪关断裂两侧地质地貌特征对比表
Table 1. Geological and geomorphologic comparison between two side of the Jiayuguan active fault
表 2 嘉峪关-文殊山断裂热释光年龄测试结果表
Table 2. Thermo-luminescence dating result of the samples from the Jiayuguan-Wenshushan fault
表 3 嘉峪关断裂新构造活动年龄数据分段统计表
Table 3. Statistical analysis of the neo-tectonic active age of the Jiayuguan active fault
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