唐古拉山上新世至第四纪古地理环境的演变(以山口地区为例)

唐古拉山横亘于青藏高原腹部地区,是世界著名大河—长江、怒江和澜沧江发源之地。笔者几年来通过该地区实地考察,对山地由于晚新生代期间强烈隆起而导致古地理环境的深刻演变获得了难忘的印象。本文拟以唐古拉山口地区为例,对山地自上新世以来自然环境的变迁作一初步探索和讨论,这或将有助于对整个青藏高原第四纪古地理环境演变的认识。

ON THE PALAEOGEOGRAPHICAL ENVIRONMENTAL EVOLUTION OF PLIOCENE-PLEISTOCENE EPOCH OF THE TANOLHA MOUNTAINS

During the Pliocene Epoch, the Tanglha Mountains were low, and broad and level dwarf ranges, not more than several hundred metres above sea level. The greater part of these ranges were a landsurface of peneplanation with an environment of subtropical foreststeppe. There were advanced karst landforms like stone forests etc. Frontmontane and intermontane basins, rivers, and lakes crisscrossed one another, thus forming deposits of fluvit al-lacustrine facies about a thousand metre deep. Since the end of the Pliocene Epoch, the Tanglha mountain has chiefly been characterized by their extensive and great-amplitude archirig and block-faulted uplift.