Silicate and carbonate mixed shelf formation and its controlling factors, a case study from the Cambrian Canglangpu formation in Sichuan basin, China

Abstract Mixed sedimentation is mainly a phenomenon by which siliciclastic and carbonate are mixed under similar sedimentary environment. The study of the composition rock can reflect sediments Canglangpu formation in eastern Sichuan basin widely developed exhibit well exploration prospects. In this study, classification diagram suitable for was proposed combining lithologic characteristics with logging data. Based on observations typical outcrop profiles, identification thin sections, drilling geological data, model established to identify electrical responses rocks area. results show that (1) be vertically divided into two complete transgression-regression cycles lower part consisting diamictite upper principally composed clastic diamictite; (2) six classes, namely sandstone, argillaceous sandy rock, mudstone, Carbonate mudstone; (3) environment (a) shore, include lagoon tidal flat, (b) shallow marine shelf, includes beach bar, terrigenous detrital shelf; (4) shore-mixed shelf has been established; it says obvious ring-like development around underwater paleo-heights. mechanism controlled change facies belt, intensity influenced early tectonic movement sea-level change.