Restoration Of The Paleoenvironment Of Late Paleozoic In Eastern Xinjiang

The research on paleoenvironment is based on the work of stratigraphic regionalization and stratigraphic division. For this, the author firstly put Eastern Xinjiang into Beijiang-Xingan stratigraphic superprovince, with a clearly understanding of the regional platectonics as the prerequisite, and divided it into 3 stratigraphic provinces,5 stratigraphic provinces. Secondly, the lithostratigraphic units sequence was established after the work of lithostratigraphic units cleaning. Using different color, the author also managed to mark the sedimentary facies of every lithostratigraphic unit in the stratigraphic sequence table. Thirdly, some controversial lithostratigraphic units such as Kalagang Formation and Haerjiawu Formation, were discussed about their age and the relationships with the upper and lower stratums. Kalagang Formation could be located to Artingskian while the Haerjiawu Formation was considered beneath Kalagang Formation, and its time period should be Asselian-Sakmarian.The restoration of paleoenvironment includes three aspects, the analysis of sedimentary environment, the research of paleobioogeography, the analysis of paleoclimate. Based on the stratigrpahic works, the author drawed more than 20 stratigraphic columns to determine sedimentary facies, confirm the sedimentary character, demarcated the ocean and land.Secondly, following the analysis of fossil samples collected in the field and according to the study on previous materials, the biological assemblage features of the research region were studied in detail. The paleogeographic attribution of palaeobios in different period was work out.Thirdly, means of experiment including X-ray powder diffraction as well as carbon and oxygen isotope analyzing were applied so as to get a clear viewpoint of the paleoclimate in different period.Finally, based on the study of stratums, the sedimentary environment, the paleobiogeography, the paleoclimate, the author drawed 7 paleogeographic maps.