Abstract

The regularities were determined for changes in the lithological and geochemical composition of rocks of the Bazhenov Formation (BF) characterized by various degrees of transformation of organic matter (OM). From the M\({\text{K}}_{2}^{1}\) to MK₂ stages (140–170–195°C), trends are seen toward (a) an increase of the quantity of limestone–dolomitic interlayers along with the dolomite content; (b) a decrease of the OM content over the entire section; (c) a decrease of the OM and sulfide sulfur concentrations in the pyrite–kerogen band of the roof of the BF; (d) a decrease of the C/S ratio; and (e) an increase of the thickness of the pyrite layer in the transition zone between the BF and overlying sediments along with the growth of the pyrite content. It was concluded that the interval between the M\({\text{K}}_{1}^{2}\) and MK₂ stages experienced OM transformation, the migration of transformation products, dolomitization of the rocks, and pyritization of low-carbon rocks in the BF-overlying Podachimovo strata.

中文翻译：

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以西西伯利亚巴热诺夫组为例的黑色页岩后生转化的岩性和地球化学证据

摘要

确定了以不同程度有机质转化为特征的 Bazhenov 组 (BF) 岩石的岩性和地球化学组成变化的规律。从 M \({\text{K}}_{2}^{1}\)到 MK ₂阶段（140-170-195°C），趋势是（a）随着白云石含量的增加，石灰石-白云岩夹层的数量增加；(b) 整个部分的 OM 含量减少；(c) 高炉顶板黄铁矿-干酪根带中有机质和硫化物硫浓度的降低；(d) C/S 比率降低；(e) 高炉与上覆沉积物之间的过渡带黄铁矿层厚度随着黄铁矿含量的增加而增加。认为M \({\text{K}}_{1}^{2}\)和MK ₂阶段之间经历了OM转化、转化产物的迁移、岩石的白云石化和黄铁矿化上覆高炉的 Podachimovo 地层中的低碳岩石。