青藏高原东北缘冷龙岭断裂全新世左旋滑动速率

doi:10.3969/j.issn.0253-4967.2017.02.005

地震地质 ›› 2017, Vol. 39 ›› Issue (2): 323-341.DOI: 10.3969/j.issn.0253-4967.2017.02.005

青藏高原东北缘冷龙岭断裂全新世左旋滑动速率

郭鹏¹, 韩竹军¹, 姜文亮^1,2, 毛泽斌^1,3

1. 中国地震局地质研究所, 活动构造与火山重点实验室, 北京 100029;
2. 中国地震局地壳应力研究所, 地壳动力学重点实验室, 北京 100085;
3. 中国地质大学(北京), 地球科学与资源学院, 北京 100083

收稿日期:2015-12-06 修回日期:2016-10-24 出版日期:2017-04-20 发布日期:2017-05-25
通讯作者: 韩竹军,男,研究员,E-mail:zjhan0904@163.com
作者简介:郭鹏,男,1989年生,2013年毕业于山东科技大学地质工程专业,获学士学位,现为中国地震局地质研究所在读硕士研究生,主要从事活动构造等方面的研究,电话:18813111575,E-mail:guopengpoli@163.com。
基金资助:
中国地震局地震行业科研专项（201408023）与中国地震局地壳应力研究所基本科研业务专项（ZDJ2015-16）共同资助

HOLOCENE LEFT-LATERAL SLIP RATE OF THE LENGLONGLING FAULT, NORTHEASTERN MARGIN OF THE TIBETAN PLATEAU

GUO Peng¹, HAN Zhu-jun¹, JIANG Wen-liang^1,2, MAO Ze-bin^1,3

1. Key Laboratory of Active Tectonics and Volcano, Institute of Geology, China Earthquake Administration, Beijing 100029, China;
2. Key Laboratory of Crustal Dynamics, Institute of Crustal Dynamics, China Earthquake Administration, Beijing 100085, China;
3. School of Earth Sciences and Resources, China University of Geosciences(Beijing), Beijing 100083, China

Received:2015-12-06 Revised:2016-10-24 Online:2017-04-20 Published:2017-05-25

摘要/Abstract

摘要： 冷龙岭断裂是青藏高原东北缘1条重要的左旋走滑断裂，断裂滑动速率对于青藏高原东北缘构造形变的动力学研究以及认识断裂的活动习性和地震危险性具有重要意义。但是，冷龙岭断裂的滑动速率仍然存在较大争议，被限定在3~24mm/a一个较为宽泛的范围内。文中以青海省门源县他里花沟上游走滑断裂断错地貌现象较为典型的牛头沟地区（37.440 2°N，102.094 0°E）和柴陇地区（37.447 3°N，102.063 0°E）作为研究对象，采用地基LiDAR获取的高分辨率DEM和高精度Google Earth卫星影像对断错地貌进行了位错演化模式分析和位错量的恢复测量，结合地貌面上开挖地层探坑和剥离新鲜地层剖面上的年代样品采集与测试，确定了断错地貌面的废弃年代。在牛头沟地区和柴陇地区得到的滑动速率分别为（6.4±0.7）mm/a和（6.6±0.3）mm/a，2个研究地区获得的结果存在较好的一致性。考虑到滑动速率的误差范围，认为冷龙岭断裂全新世以来的左旋滑动速率为（6.4±0.7）mm/a，该滑动速率介于前人采用地质方法获得的结果中间，也在InSAR得到的滑动速率4.2~8mm/a范围内，但比GPS速率（（4.0±1.0）mm/a）稍大。祁连-海原断裂带弧形分布的晚第四纪滑动速率在冷龙岭地区达到最大，青藏高原东北缘在该地区最强烈的隆升也从1个侧面证实了冷龙岭断裂在调节青藏高原相对于戈壁-阿拉善地块向E运动方面所处的重要地位。

关键词: 冷龙岭断裂, 滑动速率, 全新世, 青藏高原东北缘

Abstract: The Lenglongling Fault(LLLF) is a major active left-lateral strike-slip fault along the northeastern margin of the Tibetan plateau. Fault slip rate is of great significance for researching the dynamics of tectonic deformation in NE Tibetan plateau and understanding the activity and seismic risk of the fault. However, slip rate of the LLLF, which remains controversial, is limited within~3~24mm/a, a relatively broad range. Taking Niutougou site(37.440 2°N, 102.094 0°E)and Chailong site(37.447 3°N, 102.063 0°E) in the upstream of Talihua gully in Menyuan County, Qinghai Province as the research objects, where faulted landform is typical, we analyzed the displacement evolution model and measured the slip amounts by back-slip of the faulted landform using high-resolution DEM from Terrestrial LiDAR and high-precision satellite images of Google Earth, and by collecting and testing samples from stratigraphic pit excavated in the faulted landform surface and stripping fresh stratigraphic section, we determined the abandonment age of the surface. Holocene slip rate obtained from Niutougou site and Chailong site is(6.4±0.7)mm/a and(6.6±0.3)mm/a, respectively, which have a good consistency. Taking into account the error range of the slip rate, the left-lateral slip rate of the LLLF is(6.6±0.8)mm/a since Holocene, which is between the previons results from geological method, also within the slip rate range of 4.2~8mm/a from InSAR, but slightly larger than that from GPS((4.0±1.0)mm/a). Late Quaternary slip rate of Qilian-Haiyuan fault zone, which displays an arc-shape distribution, turns to be the largest in LLLF region. The most intensive uplift in the LLLF region of the NE Tibetan plateau confirms the important role of the LLLF in accommodating the eastward component of movement of Tibetan plateau relative to the Gobi-Ala Shan block from one side.

Key words: Lenglongling Fault, slip rate, Holocene, northeastern Tibetan plateau

中图分类号:

P315.2

郭鹏, 韩竹军, 姜文亮, 毛泽斌. 青藏高原东北缘冷龙岭断裂全新世左旋滑动速率[J]. 地震地质, 2017, 39(2): 323-341.

GUO Peng, HAN Zhu-jun, JIANG Wen-liang, MAO Ze-bin. HOLOCENE LEFT-LATERAL SLIP RATE OF THE LENGLONGLING FAULT, NORTHEASTERN MARGIN OF THE TIBETAN PLATEAU[J]. SEISMOLOGY AND GEOLOGY, 2017, 39(2): 323-341.

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青藏高原东北缘冷龙岭断裂全新世左旋滑动速率

HOLOCENE LEFT-LATERAL SLIP RATE OF THE LENGLONGLING FAULT, NORTHEASTERN MARGIN OF THE TIBETAN PLATEAU

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