This study adopted a method involving the characterization of macroscopic observations and microscopic features. Then, based on the analysis results of the Milankovitch cycles, the lacustrine fine-grained sediment grain layers and lithofacies were explored. This study theorized that any conclusions in classification based only on the differences in lithology of the fine-grained intermediated-acidic facies were not necessarily accurate. Therefore, this study proposed an up-dated index and the principles of a lacustrine fine-grained lithofacies division. These included two levels of core indicators as the divisions of the lacustrine fine-grained rock facies, which provided a basis for the classification process. The core indicators were divided into primary and secondary indicators. The basic index proposed in this study was divided into nine index types, and the secondary indicators were utilized for the determination of the fine-grain layer types. The goal was to determine if the lamination of fine-grained sediment was an important indicator of fine-grained intermediated-acidic facies classification, rather than merely a modifier. Therefore, the rock facies were divided four types of lithofacies combination: Calcite/clay grain layer combinations; calcite/organic grain layer combinations; clay/organic laminae; and calcite/clay/organic laminae. There were 21 types of facies and 33 lithofacies and classes, with each lithofacies having between 1 and 3 of the classes. Then, based on analysis results of the Milankovitch cycles of the lacustrine fine sedimentary facies, it was determined that the lacustrine fine grained lithofacies long eccentricity control was closely related to the climate and had four long eccentricity cycles of wet climate. In addition, the content levels of carbonate minerals, clastic rock minerals, and organic matter were investigated during the cyclical changes. Then, based on the analysis results, it was believed that the meters of the upper climate cycle may have been the main factors which controlled the sedimentary features and the local land areas for the fine-particle deposition provided favorable conditions. Therefore, since the climate change cycle curves were correlated with the land, it was possible to accurately rebuild in the ancient climate conditions by analyzing of the Milankovitch cycles.

本研究采用了一种涉及宏观观察和微观特征表征的方法。然后，根据米兰科维奇旋回的分析结果，对湖相细粒沉积颗粒层和岩相进行了探索。本研究认为，任何仅根据细粒中酸性相岩性差异进行分类的结论都不一定准确。因此，本研究提出了更新的指数和湖泊细粒岩相划分的原则。其中包括两个层次的核心指标，作为湖相细粒岩相的划分，为分类过程提供了依据。核心指标分为一级指标和二级指标。本研究提出的基本指标分为九种指标类型，二级指标用于确定细粒层类型。目的是确定细粒沉积物的分层是否是细粒中酸性相分类的重要指标，而不仅仅是一种改性剂。因此，将岩相划分为四种岩相组合：方解石/粘土颗粒层组合；方解石/有机颗粒层组合；粘土/有机层；和方解石/粘土/有机层。有21类相33个岩相类，每个岩相有1~3个类。然后，根据湖相细沉积相Milankovitch旋回的分析结果，确定湖相细粒岩相长偏心率控制与气候密切相关，具有四个潮湿气候的长偏心率循环。此外，还研究了周期性变化过程中碳酸盐矿物、碎屑岩矿物和有机质的含量水平。然后，根据分析结果，认为上层气候旋回的米数可能是控制沉积特征​​的主要因素，局部陆地区域为细颗粒沉积提供了有利条件。因此，由于气候变化周期曲线与土地相关，通过对米兰科维奇周期的分析，可以在古代气候条件下准确重建。