川西岷江松潘段第四纪与新构造运动特征分析

发布时间：2018-03-23 22:14

本文选题：岷江上游　切入点：第四纪盆地　出处：《地质力学学报》2017年06期

【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。
[Abstract]:On the basis of the existing investigation and research, through field geological survey and profile survey, the paper emphatically analyzes the geomorphological characteristics of Zhangla basin, Doujitai basin, Quaternary sediment type, material composition, spatial distribution and so on in the Songpan section of Minjiang River. The characteristics of the river terraces of the Minjiang River and its tributaries in the Songpan section are systematically measured and studied. The results show that the neotectonic movement controlled the evolution of the Quaternary basin in the Songpan section. The Zhangla basin and Doujitai basin were formed from the late Miocene to the early Pliocene. The faults in the west side of the basin were eastward normal faults, and the east side of the basin was the westward tilting thrust fault. The basin was formed during the movement of the uplift plate type fault block which declined from the west to the east and rose from the west to the east. The Minjiang River valley in Songpan section is characterized by alternating wide valley and narrow valley, and many lacustrine strata are developed in the main stream and its tributaries of Minjiang River. The sedimentary characteristics are Yansehu. The Songpan section in the upper reaches of Minjiang River develops 6 terraces at most, mainly erosion terraces and accumulation terraces, mainly formed in the late Middle Pleistocene and Holocene epoch. The terraces of different sections have different width and are obviously controlled by the neotectonic activities in the area. The neotectonic movement in the upper reaches of Minjiang River is characterized by north-south stripe and east-west differential tilting uplift, and the whole area above Hongqiao pass is a tectonic uplift area. There are at least three tectonic uplift, and the strength of tectonic uplift in Duojitai basin in the upper reaches of Minjiang River is higher than that in Zhangla basin on the whole. There may have been 6 tectonic uplift in Gamisi area, and the tectonic uplift in Hongqiao Guan area is obviously stronger than that in Zhangla basin.
【作者单位】：中国地质科学院地质力学研究所;国土资源部新构造运动与地质灾害重点实验室;中国地质大学(北京);
【基金】：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)
【分类号】：P534.63;P546

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