鄂尔多斯盆地姬塬地区延长组长8时期物源分析

Provenance analysis of Chang 8 period in Jiyuan area of Ordos Basin

利用砂岩薄片鉴定、重矿物及稀土元素等资料,并结合前人的研究成果,对鄂尔多斯盆地姬塬地区延长组长8时期的物源进行了分析研究。结果表明:研究区长8沉积期的物源来自盆地北东和西部边缘,其中北东方向物源为优势物源,西部方向物源为次要物源;母岩区均以变质岩地层为主,其次为岩浆岩和沉积岩,并且发现2个方向的物源在罗庞塬地区发生了交汇。

The data of sandstone thin section, heavy mineral and rare earth element combining with the former research efforts are applied to analyze the provenance of Chang 8 period in Jiyuan area. The analysis result shows that the provenances are mainly derived from the northeastern and the western margin of the basin. The mother rocks are mainly composed of metamorphic rocks, magmatic rocks and sedimentary rocks, and the two sources meet together at Luopangyuan area.