青海可可西里东部盐湖水化学及沉积特征初步研究

2008 a夏对可可西里地区东部4个新发现的盐湖,进行了卤水水化学组分、矿物组成及其石盐元素含量分析。结果表明,该区水体卤水矿化度高,湖表卤水富硼锂等组分。通过对化学组分及水化学特征系数的研究,卤水的水化学类型主要为硫酸镁亚型和硫酸钠亚型。卤水pH值随着矿化度的增加而降低。Na+、Cl-含量与总矿化度呈正相关,SO42-"与矿化度呈负相关。Li与Mg物源、迁移规律近似。本区盐类沉积物以石盐为主,石盐中Si、Al、Fe、Sr含量低,其间相关性好,物质来源可能为周围岩石风化。布查盐湖盐类沉积存在少量硬石膏、半水石膏和铁白云石,表明布查盐湖的盐类物质来源很可能与地下热水作用有关。

Preliminary Study of Hydrochemistry and Sedimentary Characteristics of Salt Lakes in Eastern Hoh Xil Region

Four salt lakes in eastern Hoh Xil region were discovered iu the summer of 2008 according to remote sensing interpretation and field survey. The hydrochemistry, mineral and element composition of the lakes are analyzed in the paper. Results indicate that brine of salt lakes with high total salinity are rich in boron and lithium. Their brine hydrochemistry types belong to magnesium sulfate and sodium sulfate subtypes. The pH value increases with the decrease of total salinity. There is a positive correlation between Na＋, C1- concentration and total salinity, while there is negative correlation between SO4^2-concentration and total salinity. Li is similar to Mg in the source and migration in the region. Main salt mineral is halite. The contents of Si, A1, Fe and Sr in halite are low and there are good correlation among them. The contents are probably from surrounding rock weathering. Anhydrite, bassanite and ankerite founded in Bucha salt lake indicate that the source of salts is probably related to underground hydrothermal solution.