| 川西岷江松潘段第四纪与新构造运动特征分析 |
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| 引用本文： | 韩建恩,郭长宝,吴瑞安,任三绍,胥彪,杨志华.川西岷江松潘段第四纪与新构造运动特征分析[J].地质力学学报,2017,23(6):864-881. |
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| 作者姓名： | 韩建恩 郭长宝 吴瑞安 任三绍 胥彪 杨志华 |
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| 作者单位： | 中国地质科学院地质力学研究所, 北京 100081;国土资源部新构造运动与地质灾害重点实验室, 北京 100081,中国地质科学院地质力学研究所, 北京 100081;国土资源部新构造运动与地质灾害重点实验室, 北京 100081,中国地质科学院地质力学研究所, 北京 100081,中国地质科学院地质力学研究所, 北京 100081,中国地质科学院地质力学研究所, 北京 100081;中国地质大学(北京), 北京 100083,中国地质科学院地质力学研究所, 北京 100081 |
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| 基金项目： | 中国地质调查局项目（DD20160271,12120113038000,1212011087114）;中国地质科学院地质力学研究所基本科研业务费项（DZLXJK201710）;中国地质科学院基本科研业务费项目（YYWF201511） |
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| 摘 要： | 在已有调查研究的基础上,通过野外地质调查和剖面测量,重点分析了岷江松潘段的漳腊盆地、斗鸡台盆地地貌特征、第四纪沉积物类型、物质成分、空间分布等特征,并系统测量和研究了松潘段岷江干流及其支流的河流阶地特征。研究表明,新构造运动控制了松潘段第四纪盆地的形态和地貌演化过程,漳腊盆地和斗鸡台盆地形成于中新世末至上新世初,西侧控盆断裂为东倾正断层,东侧为西倾逆断层,盆地为断块发生西降东升的翘板式断块运动过程中形成的,称之为"翘板式箕状盆地"。松潘段岷江河谷地貌呈现出宽谷和窄谷交替出现的特点,岷江干流及其支流中发育多处湖相地层,沉积特征表现为堰塞湖。岷江上游松潘段最多发育6级阶地,以侵蚀阶地和堆积阶地为主,主要形成于中更新世晚期—全新世时期。阶地级数具有分段性特点,不同区段阶地阶面宽窄不一,受区内新构造活动控制明显。岷江上游新构造运动表现为南北条带性和东西向差异掀斜抬升的特点,红桥关以上整体为构造隆升区,至少具有3次构造隆升,岷江上游斗鸡台盆地构造隆升强度整体上大于漳腊盆地。在尕米寺地区可能发生了6次构造抬升,红桥关一带构造抬升明显要强于漳腊盆地。
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| 关 键 词： | 岷江上游 第四纪盆地 河流阶地 新构造运动 岷江断裂带 |
| 收稿时间： | 2017/3/10 0:00:00 |
CHARACTERISTICS ANALYSIS OF QUATERNARY AND NEOTECTONIC MOVEMENTS FROM SONGPAN SECTION, MINJIANG UPPER REACHES, WESTERN SICHUAN |
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| HAN Jian''en,GUO Changbao,WU Ruian,Ren Sanshao,XU Biao and Yang Zhihua.CHARACTERISTICS ANALYSIS OF QUATERNARY AND NEOTECTONIC MOVEMENTS FROM SONGPAN SECTION, MINJIANG UPPER REACHES, WESTERN SICHUAN[J].Journal of Geomechanics,2017,23(6):864-881. |
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| Authors: | HAN Jian'en GUO Changbao WU Ruian Ren Sanshao XU Biao and Yang Zhihua |
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| Institution: | Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China;Key Laboratory of Neotectonic Movement and Geohazard, Ministry of Land and Resourses, Beijing 100081, China,Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China;Key Laboratory of Neotectonic Movement and Geohazard, Ministry of Land and Resourses, Beijing 100081, China,Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China,Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China,Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China;China University of Geosciences, Beijing 100083, China and Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China |
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| Abstract: | The Songpan section of the Minjiang River mainly refers to the section from the source of the Minjiang River to Zhenjiangguan, which is located in the transition zone of the eastern margin of Qinghai-Tibetan Plateau and Sichuan Basin, belonging to the source area of the Minjiang River. With complex topography and geomorphology, strong neotectonic movements, development of Quaternary strata, various landform types, and frequently occurred and large magnitude earthquakes, the study area is an ideal for studing the tectonic movements of Minjiang River fault zone since the late Cenozoic era. Based on the previous research, through field geological survey and profile measurement, the study focuses on the geomorphological characteristics of Zhangla Basin and Doujitai Basin, the characteristics of Quaternary sediments like types, material composition and distribution, the river terrace features of the main stream and tributaries of the Minjiang River in Songpan section are systematically measured and studied. It shows that the neotectonic movements had a controlling influence on the evolution process of the topography and geomorphology of the Quaternary Basin in Songpan section; Zhangla Basin and Doujitai Basin formed during late Miocene and early Pliocene, with an east-inclined normal fault at the west basin-controlling fault and a west-inclined reverse fault at the east. The basins formed in the process of "seesaw type" block movements with east up and west down, and we named them the "seesaw type"dustpan-like basins.Broad valley and narrow valley are alternately distributed in the Songpan section of the Minjiang valley; many lacustrine strata developed in the main stream and its tributaries, with dammed lakes as the sedimentary feature.6 grade river terraces,which mainly are eroded terraces and accumulation terraces, formed during the late Pleistocene to Holocene epoch, are the main type in the Songjiang section of the upper reaches of the Minjiang River. The terrace series has the characteristics of segmentation, and the width of terraces are different in different areas, which are obviously controlled by neotectonic movements. The neotectonic movements in the upper reaches of the Minjiang River shows the characteristics that the movements in N-S direction lie in narrow belt while those in E-W direction are different in tilt-lift, which means the upper reaches of Hongqiaoguan is overall a tectonic uplift area, with at least 3 times of tectonic uplift; the tectonic uplift intensity in Doujitai Basin is stronger than that in Zhangla Basin. There might be 6 times of tectonic uplifts in Gami temple area, and the tectonic uplift intensity in Hongqiaoguan area is much stronger than that in Zhangla Basin. |
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| Keywords: | upper reaches of the Minjiang River Quaternary basin river terrace neotectonic movement Minjiang fault zone |
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