摘要
本文根据鄂尔多斯富平一带中奥陶统高老峪组的沉积类型、沉积构造、生物化石、地球化学特征,确定中奥陶世为一碳酸盐岩古斜坡。斜坡倾向东南,海水深度在200—2000m之间,沉积速度小于290mm/1000a。
Abstract
Fuping region on the southern margin of the Ordos Basin was a distinct carbonate depositional slope in the Middle Ordovician. The characters are:1. It contains carbonate gravitational flow deposition which is the special of slope zone:2. The typical structures of slope deposition, such as rollover structure,truncated structure, rub-fold structure and slide-fold structure, well developed; 3. Though palaeoslope fossils are not rich enough In the present area,deep-water ichnofossils and microfossils developed well. 4. Trace elements as V.Ni.Sr. and Ba.show high content in the rocks; 5. The trend of the slope ranges from 128-177?, ichnofacies belong to Zoophycus and Nereites.This indicates that the water depth of the slope varied from 200 to 2000m, the average rate of sedimentation might be 318mm/1000 yrs.
论文详情