新疆乌伦古湖表层沉积物元素地球化学行为研究

total of 26 surface sediment samples from Ulungur Lake in Xinjiang were collected and analysised for major elements and trace elements with the using of XRF method. The pH, conductivity and salinity were measured while sampling at each sampling site. The results showed that there was a close correlation between MgO and SiO2; the correlation between K2O and SiO2 was bad (r2=0.198); almost no correlation between Na2O and SiO2 (r2=0.02). Most of trace elements were relative to the fine-grained sediments, and the lacustrine environment was an important controlling factor to the transformation and concentration of the metal elements. The Ca element in the lake sediments was from authigenetic calcite, while Mg and Sr were mostly from Mg-calcite and aragonite. In the closed-lakes of arid area, the proxy of Si/Al infers the lake level fluctuations: lower the Si/Al is, deeper lake with weaker hydrodynamic force will be; higher Si/Al is, stronger hydrodynamic force will be. There is no close relationship between Fe/Mn and depth of Ulungur lake.