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为了确定奈曼凹陷白垩系九佛堂组沉积物源及古气候条件,采用薄片鉴定、X射线衍射分析、扫描电镜等手段,对奈曼凹陷白垩系九佛堂组砂岩碎屑及粘土矿物含量变化规律进行了分析,确定了目的层砂岩的岩石学特征及物源特征。研究表明,奈曼凹陷九佛堂组主要沉积于火山带内的局部盆地,沉积物源为侏罗纪东北地区大规模火山喷发所形成的火山岩,沉积具有埋藏快速、物源集中等特征,沉积期古气候较湿润。
In order to confirm the sedimentary source and paleoclimatic conditions of Cretaceous Jiufotang Formation in Neiman sag, the authors used thin-slice identification, X-ray diffraction analysis and scanning electron microscopy to analyze the sandstone detritus and clay mineral content in Cretaceous Jiufotang Formation in Nei Man Sag The change rule is analyzed, and the petrological characteristics and provenance characteristics of the target sandstone are determined. The study shows that the Jiufotang Formation in the Naiman Sag mainly deposits in the local basin within the volcanic belt. The sedimentary source is volcanic rocks formed by large-scale volcanic eruptions in the northeastern Jurassic. The sediments are characterized by rapid burial and concentrated source of sediments Paleoclimate more humid period.