中文摘要：

研究内陆干旱区盐湖相淤泥水化学特征,对于深入认识干旱区淤泥早期成岩过程中的水-岩相互作用具有重要意义。以我国西北干旱区小柴旦盐湖相淤泥水为研究对象,分析淤泥水的化学特征,探讨其对早期成岩过程中水-岩相互作用的指示意义。结果显示：不同深度盐湖相淤泥水的各化学组分含量均普遍高于上覆湖水,淤泥水盐度的升高与近地表强烈的蒸发作用和湖滩析盐后再溶解作用有关。不同深度淤泥水的Na~＋、K~＋、Li~＋和Cl~-含量变化范围较小,Mg~（2＋）、Ca~（2＋）、Sr~（2＋）、SO_4~（2-）、I~-、TOC及TNb变动范围较大,Br~-和B~（3＋）随深度增加有一定程度的减少。淤泥在早期成岩过程中即发生了一定程度的水-岩作用和生物化学作用,其主要过程包括：浅地表的强烈蒸发、蒸发岩矿物沉淀、阳离子交换、硫酸盐还原菌作用下的脱硫酸过程、有机质降解等。

英文摘要：

The research on chemical characteristics of salt lake mud water in inland arid area is of great importance on understanding water-rock interaction during early diagenesis of mud sediment in arid area deeply. The present study took Xiao Qaidam salt lake mud water in arid area of northwest of China as the research object and analyzed the chemical characteristics of mud water,indicator of which to water-rock interaction during early diagenesis was discussed. The results indicate that the each chemical component content of mud water in different depth is generally higher than that of overlying salt lake water,which is different from that of marine mud water. The rising of salinity for salt lake mud water is owing to intense evaporation near surface and redissolution of salt precipitation in lakeshore. The Na~＋、K~＋、Li~＋and Cl~-content of mud water in different depth varies little,while the varying ranges of Mg~（2＋）、Ca~（2＋）、Sr~（2＋）、SO_4~（2-）、I~-、TOC and TNb are relatively large and the of Br-and B3 ＋content exhibits moderate decrease with increasing depth. The water-rock interaction and biochemical action have occurred to some degree during early diagenesis of mud sediment. The possible main processes include extensive evaporation in shallow surface,precipitation of evaporite mineral,cation exchange,desulphidation and organic matter degradation.