- 责任者：Su Zhongtang (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation ; CDUT ; Chengdu 610059 ; China) ; Chen Hongde
- 刊名：Acta Petrologica Sinica
- 出版年：2011
- 卷期：27(8)
- 关键词：白云岩 ; dolostone ; 岩石地球化学 ; lithogeochemistry ; 鄂尔多斯盆地 ; Ordos Basin
- 页码：p.2230-2238
- 图表：5 illus., 3 tables, 37 refs.
- 分类号：0803
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
The types and genetic mechanism of the Majiagou dolomite in Ordos basin are investigated using petrological analysis and geochemical methods. The results show that dolostones in Majigou Formation mainly consist of dolomicrite and crystalline dolostone. Crystalline dolostone shows medium-weak jacinth light in cathoduluinescence, with high degree of order and low content of Sr, while Na and Mn content is close to that of dolomicrite. REE distribution pattern is similar with dolomicrite and close to micrite. The distribution of δ13C is also corresponding to micrite, and fluid-inclusion homogenization tempetrature is hight. These indicate that dolomitization fluid of crystalline dolostone is similar with that of dolomicrite. Crystalline dolostone is buried dolomitisation, where continuous compaction from overlying deposits urges the sealed brine to flow laterally, thus supplies unfailing Mg2+ for dolomitisation.