Sulfur Isotopic Evidence for Biological Karst of Sulfate Rocks in Burial Environment

详细信息   

• 责任者：Zhang Feng’e (Institute of Hydrogeology & Environmental Geology ; Chinese Academy of Geological Sciences ; Shijiazhuang 050061 ; China) ; Lu Yaoru
• 刊名：Earth Science
• 出版年：2012
• 卷期：37(2)
• 关键词：碳酸盐岩储集层 ; carbonate reservoirs ; 硫同位素 ; sulfur isotopes ; 鄂尔多斯盆地 ; Ordos Basin
• 页码：p.357-364
• 图表：2 illus., 2 tables, 39 refs.
• 分类号：1003
• issnNo：ISSN1000-2383
• isbnNo：CN42-1233/P

摘要

 
    

The purpose of this study is to explore the biological karst developing mechanism at the coexistence condition of the sulfate and carbonate rock. The study focuses on the geochemical processes in water-rock-bacteria system by tracing the stable sulfur isotope (³⁴S) fractionation through laboratory experiment combined with the isotope data of the pyrite filling in Ordovician weathering crust in the Ordos Basin. The results suggest that the H₂S produced by bacterial sulfate reduction (BSR) is characterized by a significant isotope fractionation of  ³⁴S, which was controlled by temperature and the SO₄²-concentration from the dissolution of sulfate rocks in the system.