盐湖盆地斜坡带碎屑岩成岩作用特征初探──以柴达木盆地阿尔金斜坡第三系碎屑岩地层为例

Study on Diagenesis in the Slope of the Saline Lake Basin:An Example From the Tertiary of the Aerjin Slope in Caidam Basin

在柴达木盆地阿尔金斜坡第三系地层中，砂岩中碳酸盐重结晶强烈、压实程度弱、石英自生加大较弱、早期碳酸盐胶结物发育。碳酸盐主要为无机成因，少量与生物气有关，其含量受盐度的影响。泥岩中粘土矿物以伊利石、绿泥石和伊蒙混层为主，缺少蒙脱石和高岭石，随埋深增加，伊利石相对含量变化无规律可循，绿泥石相对含量减少，推测伊利石主要为陆源成因。

The Tertiary in the Aerjin Slope in Caidam Basin is characterized by strong carbonate recrystallization, weak compaction, weak quartz overgrowth and enrichment of the early-stage carbonate. The carbonate cement, influenced by the salinity to some degree,is mainly inorganic with few relation to biogas. In muds clay assemblage is illite-illite/montmorillonite-chlorite. With the increase of depth the relative content of illite fluctuates and that of chlorite decreases. The illite may be terrestrial origin.