关于新疆最近地球历史时期的古地理問题

SOME PALEOGEOGRAPHICAL PROBLEMS OF SINKIANG IN THE LATE EARTH HISTORY

本文探討新疆最近地質时期的古地理,特别注意到气候带的移位和巨大气候变化及其总的发展趋势。这些变化主要是从强烈的构从运动和冰川作用来考虑的。至于由其他因素所引起較小周期性的气候变化这里暫不予討論。新疆在白堊纪,老第三纪时期构造作用微弱,隆起的山地逐漸被夷平,西部有暖流进出古地中海,极地沒有冰盖,因此大气环流形势近似今日西欧和北非之間的环流系統。喜馬拉亚运动开始以后,古地中海消失而为新期褶皺山脉所代替,欧亚大陆联成一片,逐漸建立起东亚新的季风环流系統。新疆冬季受到蒙古—西伯利亚高压的影响,許多地方轉向干寒气候方向发展。

In the present paper dealing with the paleogeography of Sinkiang in the late geological time more attention has been paid to the shifting of the climatic zones and notable climatic changes as well as to its general tendency of development. Such changes were considered mainly due to the intensive tectonic movements and influences of the Quarternary glaciation. It was suggested that during Cretacious and Tertiary the tectonic movement was fairly weak, and the raised mountains were levelled off by peneplanation. On the western side of the country was the site of the great Tethys Sea where warm currents drifted. Through these, the planetary system of air circulation of Sinkiang at that time was quite similar to that of the Area between to-day's west Europe and North Africa; the climatical zcnation was also alike.