A PRELIMINARY STUDY ON THE EVOLUTION OF DOLOMITE-DIAGENESIS IN SOME FORMATIONS OF THE JIYANG DEPRESSION
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摘要: 本文应用岩石矿物学方法,对济阳拗陷始新统沙河街组四段上部不同埋深的藻白云岩岩心样品进行研究.结果表明,随着地层温度的升高,原白云石主要是以排钙和内部晶格调整的方式向理想白云石转变.这个过程产生了晶间孔隙.最后建立了藻白云岩的成岩演化模式.Abstract: With the basis of petrological and mineralogical studies on the algal-dolomitic coressampled from the different depths of the upper 4th Member of the Shahejie Fr.(E2) and apart of the paleozoic system,it is suggested that the change of proto-dolomite into ideadolomie should occur along with the increasing temperatures throtigh the calcium excretion-and the adjustment of inner crystal lattices.By such an evolution,the inter-pores developed in dolomitic formations and consequently,the evolutionary models can be establishedfor the algal-dolomite diagenesis.
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