摘要
通过对西昆仑山前克里雅河阶地的地貌、沉积特征及年龄测定,分析了克里雅河阶地的形成时代及其成因.结果表明,克里雅河阶地形成于约1.19Ma.西昆仑隆升是克里雅河阶地形成的主要因素,新构造活动是河流阶地级数与高差变化的直接原因,河流阶地的形成同时受到气候变化的影响.自河流阶地形成以来,西昆仑山经历了阶段式的隆升,两次强烈隆升分别发生于约1.19Ma与4.71ka,而在此之间西昆仑山的隆升幅度与速度相对较小.
There are 6 levels of river terraces of Keriya River along Western Ku nlun piedmont. By studying on the profiles,sedimentary features and ages of riv er terraces,the paper analysed the number,height,age and origin of Keriya Riv er terraces. It suggested that the formation of river terraces was about 1.19 Ma . The formation and evolution of river terraces were controlled by multiple effe cts of neotectonic,uplift of Tibet and subsidence of level etc. Main factors af fecting the development of river terraces include tectonism and climatic changes . Local tectonic activity plays a major role in evolvement of the relation heigh t and the number of levels of river terraces,according to distribution,geomorp hic characteristics and correlation of river terraces. The amplitudes and rates of uplift of Western Kunlun in each stage are significantly different. The profi les and ages of terraces indicated that there had been at least two intensive te ctonic movements since the formation of Keriya River terraces. These two events were at about 1.19 Ma,4.71 ka.
出处
《宁夏工程技术》
CAS
2004年第3期207-209,共3页
Ningxia Engineering Technology
基金
国家自然科学基金资助项目(40302027)
中国地质科学院地质调查基金资助项目(200313000059).
关键词
克里雅河
阶地
西昆仑山
隆升
Keriya River
terrace
Western Kunlun
uplift
