中国矿山工程

In order to explore the fragment provenance and structural environment characteristics of Carboniferous-Permian sedimentary rocks in Shixi area, eastern margin of Ordos Basin, some tests were carried out on the analysis of major and trace elements, mineral composition and casting thin-section of 26 mudstone samples and 17 sandstone samples. The results show that the sandstone clastic particles in the study area is mainly composed of quartz, feldspar, mica and debris. The average content of debris is higher than 20%, igneous rock debris mainly consists of volcanic tuff debris and intrusive rocks debris, accounting for 78.9%~87.2% of total content of debris, which means pyroclastic rock-volcanic lava system is the main provenance area; The parent rock of the Carboniferous-Permian terrigenous clastic in study area is felsic igneous rock, and the provenance area is recycling orogenic in southern margin of the Ordos Basin, where the terrigenous debris suppy is related to the Permian tectonic evolution of North Qilian orogenic belt.