青藏高原1∶25万区域地质调查地貌年代学研究

The implications and method for the geomorphochronological approaches to the Qinghai-Xizang Plateau in the 1∶250 000 geological survey

高原隆升及剥蚀作用的复杂性与区域差异性以及高原恶劣的气候、地理条件,使得在青藏高原空白区1∶25万区域地质调查中进行地貌年代学研究具有很大的现实意义。由于地貌是高原隆升、环境演化、新构造运动等的信息载体,地貌年代有助于重塑这些地质作用的发生时间及发展过程,因此地貌年代学研究具有重要的技术意义。1∶25万银石山幅的工作表明,地貌年代学调查对高原隆升及环境演化过程研究具有良好效果。

The geomorphochronological approaches are believed to have important implications for the 1:250 000 regional geological survey of the QinghaiXizang Plateau because of complicated features of the Plateau uplift and denudation, and foul weather and geographic conditions. The geomorphological features are technologically significant in that they may provide plenty of important informations about the Plateau uplift, environmental evolution and neotectonism, and assist in the reconstruction of the timing and evolution of geological processes. The present paper focuses the significance and method of the geomorphochronological approaches of the QinghaiXizang Plateau in the 1∶250 000 regional geological survey. The spatial relations among distinctive geomorphological features should be ascertained in the field geological survey, and the samples should be sampled from the localities suitable for the geomorphochronological approaches. The results of research in the study show that the geomorphochronological approaches are effective for the examination of the Plateau uplift and environmental evolution.