摘要
４０Ｍａ前印度板块与欧亚板块的碰撞导致了特提斯海的封闭和西藏成陆，但４０～２０ＭａＢＰ间地面很低。２０Ｍａ前的构造运动使青藏地区一些山地隆起，但而后又经历了长期的夷平，地貌与生物证据揭示，早上新世高原的高度仅约１０００ｍ。高原的强烈隆起开始于３．４Ｍａ前，这被高原内外普遍的砾岩堆积和盆地演化记录了下来。青藏高原东部盆地演化与大河流发育研究表明，至少有１０次强构造上升事件发生，它们分别开始于３．４、２．５、１．７、１．３、１．１、０．８、０．６、０．１４、０．０５和０．０１ＭａＢＰ。其中２．５、１．１、０．８、０．６和０．１４ＭａＢＰ五次上升事件对高原隆起十分重要。
The collision between the indian and Eurasian Plates approximately 40 Ma ago resulted in the complete closure of the Tethys and the formation of Tibet as a continent, but the altitude of the surface was very low between 40 Ma and 20 Ma BP. Tectonic movement happened 20 Ma ago and it resulted in the uplift of some mountains in the Qinghai-Xizang region, but the region experienced a long planation after that. Geomorphic and biologic evidence indicated that the average height of the Qinghai-Xizang Plateau was only 1000 m in early Pliocene. The intense uplift of the plateau began at 3. 4 Ma BP, which was recorded by widespread conglomerate sediment around the plateau and the evolution of many basins inside and outside of the plateau. The researches of basin evolution and developments of long rivers in the eastern Qinghai-Xizang Plateau have shown that at least ten intense uplift events occurred in the plateau, which began respectively at 3.4, 2. 5,1.7, 1.3, 1. 1, 0. 8,0. 6, 0. 14, 0. 05 and 0. 01 Ma BP. Among them, the five uplifts, happened respectively at 2. 5, 1. 1, 0. 8, 0. 6 and 0. 14 Ma BP, were important to the uplift of the Qinghai-Xizang Plateau.
出处
《兰州大学学报（自然科学版）》
CSCD
北大核心
1995年第4期160-167,共8页
Journal of Lanzhou University(Natural Sciences)
基金
国家八五攀登计划国家自然科学基金青年基金
关键词
地壳运动
夷平面
新生代
青藏高原
气候变化
tectonic movement
planation surface
the cenozoic
the Qinghai-Xizang Plateau
