DYNAMICS OF THE DEVONIAN FACIES IN THE ASHELE-CHONGHUR REGION,XINJIANG

The Ashele-Chonghur volcanic-sedimentary basin is occupied by prominant volcanic rocks associated with terrigenous and intrabasinal sediments as the products of event deposition.The authors argue that the dynamic analysis of the sedimentary facies should be emphasized,because the palaeogeographic reconstruction and facies classification can be done relying not on the traditional facies sequence analysis,but on the synthetic analysis of distinct facies indicators and sediments on the basis of regional stratigraphic analysis.The Devonian sedimentary facies are grouped,in this paper,into two categories:genetic facies and environmental facies,and the detailed study is conducted on various microfacies,thus providing a pioneering example for the study of transport mechanism and accumulational environments of the volcanic rocks with the aid of sedimentological principles and methods,and a useful tool for the reconstruction of the Devonian palaeogeographic framework in the study area and even throughout northern Xinjiang.