石油与天然气地质 ›› 1988, Vol. 9 ›› Issue (2): 171-177.doi: 10.11743/ogg19880208

• 论文 • 上一篇    下一篇

一个碳酸盐沉积古斜坡的基本特征

贾振远   

  1. 中国地质大学
  • 收稿日期:1987-02-25 修回日期:1987-12-19 出版日期:1988-06-25 发布日期:2012-01-16

FUNDAMENTAL CHARACTERS OF A CARBONATE PALAEOSLOPE

Jia Zhenyuan   

  1. China University of Geology
  • Received:1987-02-25 Revised:1987-12-19 Online:1988-06-25 Published:2012-01-16

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.