Bacterial sulphate reduction and calcite precipitation in hypersaline deposition of bituminous shales
Bacterial sulphate reduction and calcite precipitation in hypersaline deposition of bituminous shales
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作者：
B. Spiro
分析了内比穆萨（约旦谷杰里科附近）马斯特里赫特期Ghareb组的沥青页岩的结构、矿物学和化学成分。地层最底层的结果具有广泛的意义，并表明特殊的成岩过程影响了在厌氧高盐环境中沉积的富含有机物质的沉积物。单晶方解石替代石膏填充有孔虫和优势的奇数碳数之间的C28-C30正构烷烃的优势，表明硫酸盐还原细菌的活性在沉积过程中的沥青页岩在高盐度的环境。
BITUMINOUS shales of the Ghareb Formation of Maastrichtian age from Nebi Musa (near Jericho, Jordan Valley) were analysed for their texture, mineralogical and chemical composition. The results from the lowermost bed of the formation are of broad interest, and indicate special diagenetic processes affecting sediments rich in organic material deposited in an anaerobic hypersaline environment. Single crystal calcite replacement of gypsum infilling of foraminifera and a predominance of even over odd carbon numbers among C28–C30n-alkanes indicate sulphate reducing bacterial activity during deposition of bituminous shales in a hypersaline environment.