鄂尔多斯南缘奥陶纪地层对比分析

鄂尔多斯南缘奥陶系各组的地层格架有很大差异 ,中部地层区恰好处于西部祁连海与华北海的过渡带 ,其岩相变化与东部地层区差异明显 ,地层对比难度大。通过区域不整合、岩石组合和古生物特征等分析研究 ,解决了奥陶纪地层划分和对比问题。

CORRELATION AND ANALYSIS OF THE ORDOVICIAN STRATA AT THE SOUTH MARGIN OF THE ORDOS BASIN

There is a great differentia in stratigraphic frames of the Ordovician Groups at the south margin of the Ordos basin, the central part of which was just in the transition zone from the western Qilian sea to the north China sea.The lithofacies is clearly different to that in the strata of the eastern part. Therefore, the stratigraphic correlation is very difficult to be made. Studies and analysis of regional unconformity, lithological composition and paleontology have made out the stratigraphic division and correlation of the Ordovician atrata.