【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(tái)上利用數(shù)字高程模型(ASTER GDEM數(shù)據(jù))提取了格仁錯(cuò)斷裂帶153個(gè)亞流域盆地的基本參數(shù),作了面積-高程積分。統(tǒng)計(jì)結(jié)果顯示,南北2盤(pán)流域盆地的規(guī)模(面積、河網(wǎng)分級(jí))差異顯著,南盤(pán)流域盆地起伏、坡度、面積-高程積分(HI)值均略大于北盤(pán),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(shì),積分曲線由西向東具有變凸的態(tài)勢(shì)。通過(guò)分析流域巖性與降雨條件,發(fā)現(xiàn)它們對(duì)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(yàn)證了格仁錯(cuò)斷裂晚新生代南盤(pán)相對(duì)于北盤(pán)抬升,并且其南側(cè)申扎-定結(jié)裂谷可能強(qiáng)化了該差異抬升運(yùn)動(dòng)。同時(shí),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(jié)裂谷的快速隆升進(jìn)一步促成南北2盤(pán)流域不對(duì)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(guó)地震局地質(zhì)研究所 地震動(dòng)力學(xué)國(guó)家重點(diǎn)實(shí)驗(yàn)室;中國(guó)地質(zhì)大學(xué)(北京) 地球科學(xué)與資源學(xué)院;
【基金】：國(guó)家自然科學(xué)基金(41172155)資助
【分類(lèi)號(hào)】：P315.2;P931
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本文編號(hào)：2501747