THE CLOSING TIME OF PALEO ASIAN OCEAN: EVIDENCE FROM SEDIMENTOLOGY

The Central Asian orogenic belt is one of the largest accretionary orogenic belts in the world, formed in the paleo Asian Ocean subduction, arc and micro continental blocks of collage. The closing time of paleo Asian Ocean is a important scientific issues

In this study, we discoveried a marine clastic rocks of the flysch formation duiring the end of Late Carboniferous and Early Permian period, in Xiwuqi area. The type of rocks are mainly feldspathic lithic sandstone developed grad bedding and parallel bedding.It is accompanied with the zoophycos ichnofacies.

U-Pb Ages of Sedimentary Rock indicated that the deposition forming time should yanger than 289Ma.The magmatic arc of detrital zircons mainly come from its north late Early Carboniferous and Late Carboniferous, Xilinhaote Xiwuqi area.