摘要
本文通过对鲁中南上前寒武系土门群地质特征的研究,确定了土门群各组的时代归属,并应用数学地质方法划分了化学地层,进而通过苏皖北部和辽南上前寒武系的对比,阐明了晚前寒武纪华北地块东南缘的古构造环境。
Through studying the geological characteristics of the Tumen group of the upper Precambrian in the middle-southern Shandong province, the age of each formation and the time lines are approached in this paper. Then, the chemostra-tigraphy of the Tumen group is divided in the way of mathematical geology. As a result, the Tumen group could be divided into three parts: Qingbaikou System,' Xuhui System' and Sinian System. And based on the contrast with the upper Precambrian in northern Jiangsu, Anhui and the southern Liaoning provinces, it is believed that the general aspect of structural-paleogeography in the late Precambrian, was two sea basins: the Xuhui sea basin and the southern Liaoning sea basin, between which there was the ' Yishu sea gate' in the southestern edye of the northern China Block.
关键词
前寒武纪
土门群
华北地块
时代
Upper Precambrian, Tumen group' Xuhui System' . chemostratigraphy, crustal wave mosaic structure, the Northern China Block, the middle-southern Shandong province
