中国新生代古地形演化的初步模型

新生代，中国地形景观发生了巨大变化，从早期的西倾地形变为现今的东倾地形，这种地形倒转可能是诱发亚洲乃至全球新生代气候环境格局总体改变的主要根源。本文基于流线场理论和向东挤出的构造假说，采用物质平衡方法，对中国新生代古地形演化进行半定量初步研究，结果显示中国新生代古地形演化呈现西部大幅度快速隆升，东部渐进式降低，中部变化较小的变化过程，总体地势的转变过程在50－40Ma期间内已基本完成，此后地势差距逐渐加剧，中国现今的地形格局是在近10Ma期间内最后形成。

Paleotopography of China during the Cenozoic: A Preliminary Study

Significant changes occurred in the topography of China during the Cenozoic from west-tilting earlier to east-tilting at the present. It was suggested that the reversal of the topographic trend forced the reconstruction of the Asian and even the global climate and environment. Based on the slip-line field theory and the hypothesis of eastward extrusion tectonics of Asia, this study discussed a semi-quantitative test of the paleotopographic evolution of China during the Cenozoic. The results showed that rapid uplift occurred in the west, progressive subsidence in the east and minor elevation change in the middle during the paleotopographic evolution. The initial reversal of the relief trend was formed at about 10 Ma after the initial continental collision and the elevation difference has been increasing since then. The present topography of China was formed in the recent 10 Ma.