白毛伟1,,,
陈芝聪1,
柳伟波2,
席书娜3
1. 曲阜师范大学地理与旅游学院, 山东 日照 276826
2. 四川省地质矿产勘查开发局化探队, 四川 德阳 618000
3. 四川省煤田地质局一三七队地质遗迹研究院, 四川 成都 610000
基金项目: 国家自然科学基金项目（批准号：41072164）资助
详细信息
作者简介: 谢小平, 男, 51岁, 教授, 构造沉积学研究, E-mail:xp.xie@263.net
通讯作者: 白毛伟, E-mail:17863349965@163.com
中图分类号: P534.63;P542;P931.2收稿日期:2017-06-28
修回日期:2017-09-30
刊出日期:2018-01-30
Quaternary tectonic activity and tectono-geomorphic in the northeastern Longmen Mountains foreland faults zone
Xie Xiaoping1,,Bai Maowei1,,,
Chen Zhicong1,
Liu Weibo2,
Xi Shuna3
1. School of Geography and Tourism, Qufu Normal University, Rizhao 276826, Shandong
2. Geochemistry Exploration Brigade of Sichuan Bureau of Exploration and Development of Geology and Minerals Resources, Deyang 618000, Sichuan
3. Institute of Geological Relics, No. 137 Geological Team of Sichuan Coalfield Geological Bureau, Chengdu 610000, Sichuan
More Information
Corresponding author: Bai Maowei,E-mail:17863349965@163.com
MSC: P534.63;P542;P931.2--> Received Date: 28 June 2017
Revised Date: 30 September 2017
Publish Date: 30 January 2018
摘要
摘要:在Landsat遥感图像解译、ASTER GDEM数据处理、地形图分析、地质图分析和地貌剖面制作的基础之上，结合野外构造地貌考察与观测，对龙门山北东段山前区域内的构造地貌进行了定量、半定量分析，研究发现沿山前发育的水系及其演化、河道形态、河床高程、冲积扇展布均与大规模逆冲断裂有关，河流阶地不对称分布说明龙门山北东段山前断裂在扩展过程中存在着由北东向南西迁移的特征。通过宇宙核素成因埋藏年龄测试技术测定了古冲积扇的形成年龄，并利用古冲积扇的高程差异及扇根间距计算了龙门山北东段的第四纪活动速率，表明自1.73 Ma、0.54 Ma以来，龙门山北东段山前逆冲断裂的隆升速率分别为0.06 mm/a、0.09 mm/a；右旋走滑速率分别约为2.31 mm/a、1.48 mm/a。
关键词: 青藏高原东缘/
龙门山北东段/
构造地貌/
活动断裂/
第四纪
Abstract:There is a close relationship between the evolution of landforms and tectonic activities. In this paper, the authors selected north east sections of Longmen Mountains foreland faults at the eastern margin of the Tibetan Plateau as a place to study the morphotectonic features. Based on the Landsat ETM Satellite images, ASTER DEM data, topographic and geologic maps, the river channel and terraces sections by using GIS spatial analysis combined with field morphotectonics investigations and observations, the characteristics of Fujiang River alluvial fans in Wudu Basin of Jiangyou County can be quantitatively and semi-quantitatively studied based on the river channel elevations, dating data of samples, fluvial system characteristics, and distance between the fan root is measured and studied in the study area.
The results show that:(1)Typical tectonic geomorphologic features such as the drainage system, river channel, river bed elevation, alluvial fan root, large-scale thrust fault, asymmetric riverine terraces along the piedmont indicate that this thrust fault migrated from northeastern to southwestern. (2)Based on the elevation difference of alluvial fan data, cosmogenic nuclide burial ages data of alluvial fan and the distance between the fan root data, activity rates of the fault have been estimated:since 1.73 Ma and 0.54 Ma, in Early Pleistocene and Middle Pleistocene, the Longmen Mountains in north-eastern piedmont thrust fault uplift rates is about 0.06 mm/a and 0.09 mm/a respectively; the fault right-lateral strike-slip rates is about 2.31 mm/a and 1.48 mm/a respectively. (3)The Longmen Mountains in north-eastern piedmont fault right-lateral strike-slip rates are larger than that uplift rates since Late Pleistocene, indicate that the north east Longmen Mountains tectonic belt is given priority to the right-lateral strike-slips, and supplemented by thrust fault.
Key words:eastern margin of Qinghai-Tibet Plateau/
northeastern section of Longmen Mountains/
morphotectonics/
active fault/
Quaternary
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