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青藏高原的形成与隆升是多期次的,尤其早更新世晚期的快速隆升对全球气候变化、我国西部盆-山地貌形成与荒漠化的出现有着重大影响,这已成为近年地学研究的热点问题。通过对高原东北缘-柴达木盆地西部地区角度不整合面上下地层中红色泥岩36Cl断代法定年,首次测定该事件发生在早更新世晚期至中更新世(1.54～0.28MaB.P.)之间。结合敦煌盆地同时代地层(0.837MaB.P.和1.142MaB.P)的低角度掀斜现象,以及前人在塔里木盆地、柴达木盆地、吐鲁番—哈密盆地、酒西盆地的研究结果,认为早更新世晚期,受青藏高原快速隆升北向挤压作用的影响,我国西北地区发生了一次重要的构造事件,造成大范围的挤压变形与山脉隆升,这对我国西北地区构造格架的最终形成和晚期油气运移成藏具有重要意义。
The formation and uplifting of the Qinghai-Tibet Plateau are multiple times, especially the rapid uplift in the late Early Pleistocene had a significant impact on global climate change, the formation of basin-mountain landscape and the emergence of desertification in western China, which has become a hot research topic in recent years. problem. The 36Cl dating of middle-red mudstone in the upper and lower strata of the unconformity surface in the northeastern margin of the plateau-western Qaidam basin is the first determination of the event occurring in the late Early Pleistocene to Middle Pleistocene (1.54-0.28 MaB.P.) between. Combined with the low-angle tilt of the contemporaries in the Dunhuang Basin (0.837MaB.P. And 1.142MaB.P) and the previous studies in Tarim, Qaidam, Turpan-Hami basin and Jiuxi basin, Early Early Pleistocene, by the rapid uplift of the Qinghai-Tibet Plateau northward squeezing effect, an important structural event occurred in northwestern China, resulting in a wide range of extrusion deformation and uplift of mountains, which tectonic framework of the Northwest China The final formation and late hydrocarbon migration and accumulation are of great significance.