Abstract:

The Ｒenacuo area of Gaize, Tibet, in the southern Qiangtang Basin, shows a series of strikingly thick carbonate layersResearch on C and O isotopes in the area plays an important role in the reconstruction of the paleoenvironment and the identification of the sedimentary characteristicsBased on the geological map of the lithostratigraphy (1∶2,000), the numerous samples collected in the field and analysis of the C and O isotopes, the Z values of salinity from 12632 to 13537, which indicates that the paleoseawater in the Ｒenacuo area of Gaize ranges from normal marine to hypersalineIn addition, the average temperature of the paleoseawater is 224 ℃, firm evidence of a warm climateBoth the rates of δ18O and δ13C vary with respect to the sea level： the deeper the seawater, the higher the δ18OThe paleotemperature and paleosalinity from the determination of C and O isotopes closely reflect the related sedimentary facies

Key words: carbon and oxygen isotope, paleoenvironment, Riganpeicuo Formation of Upper Triassic, Renacuo area of Gaize, , Tibet