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Geochemistry of Sandstones from Bayin Gebi Formation and Suhongtu Formation of Lower Cretaceous in Chagan Sag of Yin-E Basin

XIAO Bin;Geophysical Research Institute of Zhongyuan Oilfield Company,SINOPEC;  
Geochemical characteristics of sandstone can effectively provide geological information about source area.Microscopic thin sections of sandstones from Bayin Gebi Formation and Suhongtu Formation of Lower Cretaceous in Chagan sag were analyzed and their major elements were tested,in order to discuss the provenance attributes of sandstones and tectonic settings of their source areas.The analysis results show that the petrological characteristics of sandstones from Bayin Gebi Formation and Suhongtu Formation are similar,and that the characteristics of their major elements vary slightly.Comprehensive research suggests that the sandstones have low maturity and higher matrix contents,and the lithology is mainly composed of feldspathic lithic sandstones and lithic feldspathic sandstones,and that source rocks mainly comprise intermediate-acidic rocks(main felsic composition),followed by neutral and acidic rocks,and a tiny amount of basites.And it was showed that the research area had generally been located in a tectonically active region for a long time,where the climate had been cold-and-dry for a long period and the debris had low chemical weathering degree.Provenance analysis shows that the tectonic settings in source areas are mainly active continental margin and island arc,slightly passive continental margin and basically no craton standing for stable tectonic setting,and that the tectonic setting in the main source area is active continental margin,which properties of tectonic setting remain relatively stable for long.
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