SEDIMENTARY FACIES AND PALAEOGEOGRAPHY OF THE DEVONIAN STRATA IN THE ASHELE AND CHONGHUR REGIONS,XINJIANG

The volcanic rocks associated with the terrigenous elastic rocks and intrabasinal sedi-mentary rocks predominate in the Devonian strata in the Ashele and Chonghur regions, Xinjiang.According to the viewpoint of the genetic facies and environmental facies,five types of genetic facies and five types of environmental facies may be recognized for these regions.The former comprise volcanic facies,tempestite facies,volcanic gravity flow fa-cies,volcanic turbidity current facies and terrigenous elastic turbidity current facies,and the latter include abyssal-subabyssal facies,shallow shelf facies,littoral and shallow ma-rine facies,organic reef or bank facies and restricted platform facies.The detailed study of sedimentary facies and palaeogeography of the Devonian strata in the study area allow the mode of thinking and working models to be proposed for the study of sedimentary facies and palaeogeography in the volcanic-sedimentary basins.