湖北省巴东栖霞组沉积成岩作用地球化学特征研究

在详细的沉积作用、成岩作用研究基础上，利用多元统计分析方法重点对湖北省巴东水布垭剖面栖霞组碳酸盐岩地球化学特征进行了分析。研究表明，该组碳酸盐岩中 CaO 、Al₂O₃ 、K₂O 、Fe₂O₃ 、P、Ba 和 Mn的含量主要与沉积环境或原岩岩性有关，地层中SiO₂、MgO 、Sr 和 Na 的含量主要与成岩作用有关。建立了栖霞组沉积成岩作用地球化学模式。该研究合理地解释了本组岩石特殊的地球化学特征，深化了对该组岩石形成环境，特别是成岩环境的认识，区分了沉积作用和成岩作用对该组岩石地球化学特征的影响，对合理地选取有关地球化学参数研究该组岩石及类似地层的沉积作用和成岩作用具参考价值。

Geochemistry of Sedimentation And Diagenesis in Qixia Formation (Early Permian) of Badong,Hubei Province

Sedimentation and diagenesis are two major factors contributing to geochemical features of sedimentary carbonates.Integrated with studies of sedimentology and diagenesis,multivariate analysis of about 80 carbonate samples collected from Badong,Hubei Province suggested that the contents of CaO,Al 2O 3,K 2O,Fe 2O 3,P,Ba and Mn in the Qixia Formation dominantly relate to the sedimentary environment and/or.petrology,Al 2O 3 and K 2O among them to the contents of terrigenous detritus;while those of SiO 2,MgO,Sr and Na to diagenesis.The strontium contained in the succession underwent a complicated process initiated from stabilizition of calcium carbonate mineral,through the formation of celestite during early diagenetic stage to its replacement by calcite during late diagenetic stage.In addition,this research sheds light on the sedimentary and diagenetic environments of the carbonate succession.For example,a dysaerobic sedimentary background and a submarine diagenetic environment were implied,and early diagenetic succession in terms of geochemical features was recovered for the formation.