青藏高原东北边缘泥石流发生与沉积史初探

A Brief Review on the Debris Flow Occurrence and Deposition at the Northeastern Fringe of Qinghai-Xizang Plateau

文章对青藏高原东北边缘的古泥石流发生历史进行了分析 .研究表明 :古泥石流主要发生于 3 0～ 3 5Ma,2 4～ 2 5Ma ,1 9～ 1 6Ma ,1 0～ 1 1Ma ,0 7～ 0 9Ma ,0 6Ma,0 33Ma ,0 1～ 0 14Ma以及全新世 .泥石流是气候变化和构造运动的共同产物 ,随着晚上新世以来青藏高原及周围山地在一系列构造运动影响下逐步隆升 ,导致地形反差加大 ,气候冷暖变化频繁 ,泥石流爆发的频率加大 .人类活动只能加剧泥石流的爆发 ,却不能从根本上阻止它的发生 .随着全球变暖 ,有可能出现一些灾害性的气候变化 ,这必然会导致中国西部泥石流的发生频率和规模有所加大 .

A short synthesis of the debris flow of most sites over the northeastern fringe ofQinghai Xizang Plateau indicates that debris flow occurred frequently in the past, mainly at about 3 0～3 5Ma,2 4～2 5 Ma,1 9～1 6 Ma,1 0～1 1 Ma,0 7～0 9 Ma,0 6 Ma,0 33 Ma,0 1～0 14Ma and the Holocene period. The occurrence debris flow is a function of climate change and tectonic movement. The progressive uplift of the Qinghai Xizang Plateau and other mountains intensifies the development of debris flow in frequently and scale. Human activities merely worsen this trend but cannot prevent its occurrence absolutely. With the global warming, a more serious occurrence of debris flow would be happened in western China. Government and scientists should pay more attention to it in the development of western China.