内蒙古合同察汗淖碱湖成碱过程中的生物地球化学作用

BIOGEOCHEMICAL PROCESS DURING SODA MINERALIZATION IN THE HETONG QAHAN NUR SODA LAKE, INNER MONGOLIA

本文介绍了内蒙古合同察汗淖碱湖的自然环境、地质演变过程和碱湖卤水的形成演化机理。指出补给碱湖的初始淡水中2(Ca^(2+)+Mg^(2+))/HCO_3^-的摩尔比值接近于1(0.96),不利于向碱性卤水的演化。然而,在从淡潜水向高浓度碱性卤水演变过程中存在着明显的碱质富集现象。这种现象与当地的生态环境和生物地球化学作用密切相关。以富集钠元素为特征的干旱耐盐碱植被为湖水富集碱质作出了重要贡献。

This paper introduces the natural enviorenment, geological evolution nd soda-forming mechanism of the Hetong Qahan Nur Soda Lake in Inner Mongolia. It is suggested that in the initial dilute groundwater recharging the lake, the 2(Ca2++Mg2+)/HCO3- molar ratio should be close to 1 (0. 96), which is disadvantagous to the formation of soda brines. But during the evolution from dilute water to high-concentrated soda brine, there are obvious gains of Na+ and HCO3- + CO32-. Drought-enduring and halotolerant (alkaliotolerant) plants which are rich in Na in their bodies may contribute much to the gains.