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通过实测地层剖面,薄片观察,粒度分析,X衍射和阴极发光特征分析,对留山盆地上三叠统碎屑岩的沉积构造、碎屑成分和结构等进行了详细的研究,进而对沉积物源区进行了分析.结果表明,留山盆地上三叠统是一套近源沉积,沉积物质主要来源于秦岭造山带的晋宁期-华力西期侵入岩、中元古界宽坪群变质岩和古生界二郎坪群火山岩,而华北陆块古老基底及其上部沉积岩未对盆地提供物源,佐证了留山盆地为一个孤立盆地.
The sedimentary structure, detrital composition and structure of the Upper Triassic clastic rocks in the Liushan Basin are studied in detail by the measured formation profile, thin slice observation, particle size analysis, X-ray diffraction and cathodoluminescence characterization. The results show that the Upper Triassic of the Lushan Basin is a set of Jinning-Warisian intrusive rocks with proximal deposits and sedimentary origin mainly from the Qinling orogenic belt, metamorphic rocks from the Middle Proterozoic Kuping Group And the Erlangping Group volcanic rocks in the Paleozoic, whereas the ancient basement and its upper sedimentary rocks in the North China terrane did not provide provenance for the basin, which proves that the Rushan Basin is an isolated basin.