试论石炭纪华北海与扬子海之连通

A BRIEF DISCUSSION ON THE LINK BETWEEN NORTH CHINA SEA AND YANGTZE SEA

在华北地块西部,自最北部的山西鹅毛口至大同,向南至附城、豫东,石炭纪以海陆交互相为主,边缘出观陆棚。华北地块中部广大地区为海陆交互相。在华北地块东部,碎屑岩比自北而南递减,海相灰岩层数和厚度递增,越向南越呈现扬子型沉积特点。综合这些特征是:1.华北地块南北边缘接近古陆(岛),且陆缘不甚稳定;2.石炭系海相层自北而南逐渐发育,本溪组、太原组的岩石组合特征逐渐接近扬子型,并与苏北滨海县扬子型石炭系呈现连续过渡;3.华北本溪组、太原组(豫东、徐淮地区)与下扬子区黄龙组、船山组共同发育了相同或极相似的(?)带,腕足类等也呈现混生杂处。这些特征显示石炭纪华北海与下扬子海在苏皖地区呈现较广阔的连通。在华北南部和西部,华北海与中、上扬子海及祁连海连通。

In this paper we point out that the western part of North China Plate (NCP), north to Emaokou-Datong, Sanxi Province and south to Fucheng, Sanxi Province and west Henan Province, is mainly sea-land replacement facies with land facies in the edges, while the middle NCP is replacement facies. From north to south in the eastern NCP, the Carboniferous clastic ratio decreases, layer numbers and thickness of sea-facies limestone increase, and the sedimentary facies is more similar to Yangtze-tyPe one. These characters show that: 1.The north and south edges of NCP are close to the old land (island) with less stable land-edge; 2.From north to south, the Carboniferous sea facies layers are gradually deve- loped, the rock association of Benxi Formation and Taiyuan Formation is more similar to that of Yangtze type and has the relationship of continuous transition with Yangtzetype Carboniferous in Binhai County, northern Jiangsu Province; 3.Fusulinid Zones developed in Benxi Formation, Taiyuan Formation of East Henan Province, Xuzhou area and Huainan, similar to or the same with Huanglong Formation, Chuanshan Formation of Lower Yangtze area, while the Brachiopods also mixed there. Therefore, we conclude that Carboniferous Norh China Sea may be widely linked with Lower Yangtze Sea in Jiangsu-Anhui area, and connected with Middle, Upper Yangtze Sea and Qilian Sea in the southern and western parts of NCP.