| 涪江上游流域盆地地貌特征及构造指示意义 |
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| 引用本文： | 陈浩,杜华明,董廷旭,李勇.涪江上游流域盆地地貌特征及构造指示意义[J].第四纪研究,2020(1):148-156. |
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| 作者姓名： | 陈浩 杜华明 董廷旭 李勇 |
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| 作者单位： | 绵阳师范学院;成都理工大学 |
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| 基金项目： | 四川省科技厅科技计划项目(批准号:2019YJ0496);四川省教育厅自然科学基金项目(批准号:14ZB0265)共同资助。 |
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| 摘 要： | 对涪江上游流域盆地地貌特征及成因进行研究,有助于揭示青藏高原东缘晚新生代以来新构造活动的差异性。本文以ArcGIS水文分析模块为技术平台,在研究区域内系统提取涪江上游流域盆地地表水系网络和涪江干流东西两侧36个亚流域盆地,并对亚流域盆地面积、周长、水系总长度、水系分支比、流域盆地演化阶段进行统计分析,结果表明,涪江干流河道东西两侧典型地貌参数存在显著差异。通过对该区域构造运动、岩石抗侵蚀能力、降水特征等几方面因素与河流下切过程相关性的分析可知,降水条件和岩性差异并不是涪江上游亚流域盆地不对称发育的主要影响因素,该区域断裂活动导致的地形不对称分布格局及岩层破碎程度的差异是涪江上游流域地貌差异演化的主控因素。另外,涪江上游干流展布呈现出两个特征:涪江干流河道因雪山断裂、北川-映秀断裂、彭县-灌县断裂的右旋(或左旋)走滑作用而沿断裂发生同步弯曲;涪江干流河道在北川-映秀断裂北侧由西北-东南流向转变为近正南流向,究其原因,主要是龙门山断裂带3条主干断裂的区域性右旋走滑活动驱动该区域物质产生相应右旋运动,从而使长期处于断层右旋作用控制之下的涪江干流河道发生转向。
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| 关 键 词： | 涪江上游 流域盆地 地貌特征 新构造 |
GEOMORPHOLOGIC CHARACTERISTICS OF THE UPPER REACHES OF FUJIANG DRAINGE BASIN AND ITS STRUCTURAL IMPLICATIONS |
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| Chen Hao,Du Huaming,Dong Tingxu,Li Yong.GEOMORPHOLOGIC CHARACTERISTICS OF THE UPPER REACHES OF FUJIANG DRAINGE BASIN AND ITS STRUCTURAL IMPLICATIONS[J].Quaternary Sciences,2020(1):148-156. |
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| Authors: | Chen Hao Du Huaming Dong Tingxu Li Yong |
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| Institution: | (College of Resources and Environmental Engineering,Mianyang Teachers'College,Mianyang 621006,Sichuan;National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,Sichuan) |
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| Abstract: | Study on geomorphologic characteristics and forming reason of the upper reaches of the Fujiang River basin are conducive to revealing the regional difference of neotectonic movement on eastern margin of Tibetan Plateau since the Late Cenozoic.Hydrological analysis on the module of ArcGIS was applied to extract the Fujiang drainage networks and obtained 36 drainage sub-basins along the both sides of the river.Statistical analysis of the geomorphic parameters(e.g.areas,perimeters,total channel lengths,branching ratios,evolutional stages)of the sub-basins was also conducted based on this module.The results showed that there was a significant difference on the both sides of the main channel.The analysis on the correlation between river incision and controlling factors such as tectonic movement,rock types,precipitation characteristics shows that precipitation condition and lithology are not the main controlling factors of the development of sub-basins.It shaped a special geomorphic pattern in the upper reaches of Fujiang River basin,and the main controlling factors leading to the geomorphic evolution could be the asymmetrical distribution of terrain and the difference of degree of ore-rock fragmentation caused by the fault activity.In addition,the distribution of main stream of Fujiang River shows two characteristics:the main stream of Fujiang River is curved synchronously along the fault due to right-lateral(or left-lateral)strike-slip movement of Xueshan Fault and Beichuan-Yingxiu Fault and Pengxian-Guanxian Fault.The flow direction of main stream of Fujiang River changed from northwest-southeast to near south on the northern side of Beichuan-Yingxiu Fault.The main reason is that the regional dextral strike-slip activity of the three main faults in Longmenshan fault zone drives the corresponding dextral movement of the materials in this area,which causes the main stream of Fujiang River under the control of dextral action of the fault to change direction. |
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| Keywords: | the upper reaches of Fujiang drainge basin geomorphologic characteristics neotectonic |
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