【摘要】：依據(jù)谷歌地球提供的影像(Landsat和GeoEye)和野外工作,在ArcGIS平臺上利用數(shù)字高程模型(ASTER GDEM數(shù)據(jù))提取了格仁錯斷裂帶153個亞流域盆地的基本參數(shù),作了面積-高程積分。統(tǒng)計結果顯示,南北2盤流域盆地的規(guī)模(面積、河網(wǎng)分級)差異顯著,南盤流域盆地起伏、坡度、面積-高程積分(HI)值均略大于北盤,積分曲線總體呈"南凸北凹"的形態(tài)特征;在斷裂走向上,盆地起伏、平均坡度、HI值皆呈"東南高、西北低"的趨勢,積分曲線由西向東具有變凸的態(tài)勢。通過分析流域巖性與降雨條件,發(fā)現(xiàn)它們對以上地貌參數(shù)的影響有限。因此,流域盆地差異地貌特征反映并驗證了格仁錯斷裂晚新生代南盤相對于北盤抬升,并且其南側申扎-定結裂谷可能強化了該差異抬升運動。同時,可能指示岡底斯-念青唐古拉山晚新生代早期隆升為流域盆地提供了向N掀斜的先存地貌面,后期該山體和申扎-定結裂谷的快速隆升進一步促成南北2盤流域不對稱的發(fā)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.
【作者單位】： 中國地震局地質(zhì)研究所 地震動力學國家重點實驗室;中國地質(zhì)大學(北京) 地球科學與資源學院;
【基金】：國家自然科學基金(41172155)資助
【分類號】：P315.2;P931
，

本文編號：2501747