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《GEOCHIMICA》 1995-03
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PALAEOCLIMATIC IMPLICATIONS OF OXYGEN ISOTOPE PROFILES OF AUTHIGENIC CARBONATES FROM INLAND CLOSED LAKES

Wei Keqin; Lin Ruifen(Guangzhou Institute of Geochemistry, The Chinese Academy of Sciences, Guangzhou 510640)  
The evaporation from a terminal lake can be well described using the equations of Craig Gordon and Gonfiantini. The δ-value of the lake water under steadystate conditions may be obtained on the simplified equation:δs=(l - h)δI + hδa+εtot, which indicates that the δ-value is mainly a function of h (relative humidity),δI and t (℃). The time interval to establish the steady-state conditions is rather short. The δ-value of the lake water is close to δs when t=2τ(residence time).The residence time of the Qinghai Lake is about 33.4a. Most points of the δ18O profiles represent the δ-value of the carbonates in equilibrium with the lake water under steady-state condition. The relative humidity is an important parameter but difficult to be measured.A method to estimate the average value of relative humidity is proposed based on the local evaporation line of meteoric water. The value h is about 21% for southern Xinjiang, where the climate is extremely dry, and about 48% for the centralpart of Tibet.The δ-values of the lake water and the authigenic carbonates at present time have been observed from three Chinese lakes. The results show that the temperature of crystallization of the authigenic calcite calculated on the fractionation equation is much higher than the local average temperature. It appears that the calcite precipitation takes place only after the melting of the ice cover of the winter period. The temperature effect on isotopic composition of meteoric water is the basis for palaeoclimatic reconstruction. The δ-value of precipitation is much lower in summer than in winter in the monsoon areas in China, due to the low concentration of heavy isotopes in warm-moist air masses brought in by the summer monsoon. It is shown that the ground surface temperature and relative humidity during the monsoon prevailing period (10 000-8500a B.P.) were higher than at present in the area around the Qinghai Lake. The summer monsoon has been weakening gradually and the clirnate getting colder and drier with higher δ-value of precipitation since 8500a B.P.
【CateGory Index】: P578.6
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