摘要
本文讨论的范围系指柴达木盆地之北,阿尔金山以东,北山至北大山以南,贺兰山至六盘山以西的地域。笔者搜集了晚古生代地层剖面506条,以世为单位编制了岩相古地理图6张。据此追溯了该区晚古生代古地理变迁,为古构造演化的研究提供了线索。祁连山区晚古生代地层较发育,均属祁连山早古生代褶皱隆起后之沉积。雪山群时代曾被确定为早中泥盆世,有许多新资料说明它应划归为中泥盆世。
Abstract
The 506 pieces of section of Upper Paleozoic have been collected by the author to compile six lithofacies paleogeographic maps which can be summarized as follows: 1.After Qilian movement, ancient Qilian trench transformed into continent, and six deep N60° intermontane basins, trending parallel, with very thick sediments were formed. At the end of Late Devonian, elevation gradually appeared in the northern Qilian basin, while southern Qilian that had been paleoplain, became an intermontane basin. 2.In Early Carboniferous, the three southern Qilian intermontane basins were linked up by marine transgression, with Late Carboniferous further extended. Ancient Qilianshan was a wide and shallow epi-continental sea, which was connected with North China. The sediments,paleontologic groups and ore-bearing in the areas are very similar. 3. In Early Permian, the sea water receded southward, and the epicontinental sea of Northern Qilian became intermontane basin, the deposits are similar to that of North China. In Late Permian, Northern Qilian basin uplifted in the east, while southern sea area contracted and became asea bay. This is possibly caused by the controlling of Qi, Liu, Helan ε-type structures and Kang-Zang η-type structure.
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