摘要
本文在野外考察的基础上并参照洞穴次生方解石的年代资料和有关文献 ,指出青藏高原目前所见到的岩溶地貌主要是第三纪古岩溶地下部分经后期剥蚀形成的。更新世间冰期至少在高原南部的湿热型岩溶地貌得以延续 ;更新世冰期在灰岩山地冰川槽谷的边缘 ,冰川融水作用亦可发育小型洞穴。现代灰岩表面一些深度在十几厘米以下的平行溶沟则形成于全新世。晚新生代以来青藏高原岩溶地貌经历了一个从低海拔到高海拔、从较低纬度到较高纬度的三维演化过程。
There has been a strong controversy about the origins of the limestone landforms on Qinghai Tibet Plateau for a long time. It is believed that the current limestone karst landforms on the plateau was originated from the Tertiary underground karst. When the plateau was uplifted,the limestones above the Tertiary underground karst were eroded away and the underground karst was exposed.The tropical subtropical type of karstification continued at least on the southern part of the plateau during the Pleistocene inter glacial epoch.This kind of karst landforms is called the old karst in this paper. However, during the Pleistocene glacial epoch, the melting water of the Pleistocene glaciers could form some small scale karst caves along the margin of the glacial valley in the limestone mountains. The parallel oriented karrens on the present limestone surface with a depth no more than 10 cm and so on are the results of the Holocene erosion. These karrens are named modern karst. The karst landforms on the Qinghat Tibet Plateau underwent a distinctive three dimensional evolution process since the Late Cenozoic,i.e.the karst landforms changed from lower altitude and latitude to higher altitude and latitude.
出处
《古地理学报》
CAS
CSCD
2001年第1期85-90,共6页
Journal of Palaeogeography：Chinese Edition
基金
国家自然科学基金资助项目 (批准号 :4990 10 0 2
493710 11)
关键词
晚新生代
青藏高原
岩溶地貌
演化
Qinghai Tibet Plateau, Late Cenozoic, karst landforms, evolution
