格仁错断裂带流域地貌特征及其构造指示意义
发布时间：2019-06-18 19:55
【摘要】：依据谷歌地球提供的影像(Landsat和GeoEye)和野外工作,在ArcGIS平台上利用数字高程模型(ASTER GDEM数据)提取了格仁错断裂带153个亚流域盆地的基本参数,作了面积-高程积分。统计结果显示,南北2盘流域盆地的规模(面积、河网分级)差异显著,南盘流域盆地起伏、坡度、面积-高程积分(HI)值均略大于北盘,积分曲线总体呈"南凸北凹"的形态特征;在断裂走向上,盆地起伏、平均坡度、HI值皆呈"东南高、西北低"的趋势,积分曲线由西向东具有变凸的态势。通过分析流域岩性与降雨条件,发现它们对以上地貌参数的影响有限。因此,流域盆地差异地貌特征反映并验证了格仁错断裂晚新生代南盘相对于北盘抬升,并且其南侧申扎-定结裂谷可能强化了该差异抬升运动。同时,可能指示冈底斯-念青唐古拉山晚新生代早期隆升为流域盆地提供了向N掀斜的先存地貌面,后期该山体和申扎-定结裂谷的快速隆升进一步促成南北2盘流域不对称的发育。
[Abstract]:According to the images provided by Google Earth (Landsat and GeoEye) and field work, the basic parameters of 153 subbasin basins in Geren fault zone are extracted by using digital elevation model (ASTER GDEM data on ArcGIS platform, and the area-elevation integral is made. The statistical results show that there are significant differences in the scale (area, river network classification) between the north and south basins. The (HI) values of basin undulation, slope and area-elevation integral in the south basin are slightly larger than those in the north basin, and the integral curve shows the morphological characteristics of "south convex north depression". In the fault strike, the basin undulation, average slope and HI value all show the trend of "southeast high, northwest low", and the integral curve has a convex trend from west to east. By analyzing the lithology and rainfall conditions of the basin, it is found that they have limited influence on the above geomorphological parameters. Therefore, the differential geomorphological characteristics of the basin reflect and verify the uplift of the late Cenozoic southern plate of the Geren fault compared with the northern plate, and the Shenza-Dingjie rifting valley on the south side of the basin may strengthen the differential uplift movement. At the same time, it may be indicated that the uplift of Gangdisi-Nianqing Tanggula Mountain provided the basin with a pre-existing geomorphological surface of N tilting, and the rapid uplift of the mountain body and the Shenza-Dingjie rifting valley in the later stage further contributed to the asymmetrical development of the north and south basins.
【作者单位】： 中国地震局地质研究所 地震动力学国家重点实验室;中国地质大学(北京) 地球科学与资源学院;
【基金】：国家自然科学基金(41172155)资助
【分类号】：P315.2;P931
，
本文编号：2501747
[Abstract]:According to the images provided by Google Earth (Landsat and GeoEye) and field work, the basic parameters of 153 subbasin basins in Geren fault zone are extracted by using digital elevation model (ASTER GDEM data on ArcGIS platform, and the area-elevation integral is made. The statistical results show that there are significant differences in the scale (area, river network classification) between the north and south basins. The (HI) values of basin undulation, slope and area-elevation integral in the south basin are slightly larger than those in the north basin, and the integral curve shows the morphological characteristics of "south convex north depression". In the fault strike, the basin undulation, average slope and HI value all show the trend of "southeast high, northwest low", and the integral curve has a convex trend from west to east. By analyzing the lithology and rainfall conditions of the basin, it is found that they have limited influence on the above geomorphological parameters. Therefore, the differential geomorphological characteristics of the basin reflect and verify the uplift of the late Cenozoic southern plate of the Geren fault compared with the northern plate, and the Shenza-Dingjie rifting valley on the south side of the basin may strengthen the differential uplift movement. At the same time, it may be indicated that the uplift of Gangdisi-Nianqing Tanggula Mountain provided the basin with a pre-existing geomorphological surface of N tilting, and the rapid uplift of the mountain body and the Shenza-Dingjie rifting valley in the later stage further contributed to the asymmetrical development of the north and south basins.
【作者单位】： 中国地震局地质研究所 地震动力学国家重点实验室;中国地质大学(北京) 地球科学与资源学院;
【基金】：国家自然科学基金(41172155)资助
【分类号】：P315.2;P931
，
本文编号：2501747
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