| 青藏高原湖泊小流域水体离子组成特征及来源分析 |
| 摘要点击 3385 全文点击 2074 投稿时间：2014-08-31 修订日期：2014-10-10 |
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| 中文关键词 青藏高原 湖泊 支流 离子 来源 |
| 英文关键词 Tibetan Plateau lakes inflowing rivers ions sources |
| 作者 | 单位 | E-mail | | 李鹤 | 天津师范大学天津市水资源与水环境重点实验室, 天津 300387
天津师范大学城市与环境科学学院, 天津 300387 | lihexiazhi@163.com | | 李军 | 天津师范大学天津市水资源与水环境重点实验室, 天津 300387 | lijun5931@163.com | | 刘小龙 | 天津师范大学天津市水资源与水环境重点实验室, 天津 300387 | | | 杨曦 | 天津师范大学天津市水资源与水环境重点实验室, 天津 300387 | | | 张伟 | 贵州师范学院地理与旅游学院, 贵阳 550018 | | | 王洁 | 天津师范大学天津市水资源与水环境重点实验室, 天津 300387
天津师范大学城市与环境科学学院, 天津 300387 | | | 牛颖权 | 天津师范大学天津市水资源与水环境重点实验室, 天津 300387
天津师范大学城市与环境科学学院, 天津 300387 | |
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| 中文摘要 |
| 对青藏高原咸水湖蓬错、昂仁金错、打加错,淡水湖打加芒错、达格架温泉及各湖入湖支流阴、阳离子组成进行了分析. 咸水湖阴离子以 HCO3-、SO42-为主,阳离子以 Na+为主, 属HCO3-SO4-Na和HCO3-Na型水; 各湖支流及淡水湖阴离子以 HCO3-或SO42-为主,阳离子以 Ca2+或Mg2+为主,属 HCO3-Ca、HCO3-Ca-Mg、HCO3-Mg-Ca、HCO3-SO4-Ca、SO4-HCO3-Ca型水; 达格架温泉阴离子以 HCO3-为主,阳离子以 Na+为主,属 HCO3-Na型水. 咸水湖主要受蒸发-结晶作用控制,各湖支流及淡水湖主要受碳酸盐岩风化控制,达格架温泉主要受热水-花岗岩作用控制. 碳酸盐矿物沉淀时Ca2+优先Mg2+被移除,导致咸水湖具有较高的Mg2+/Ca2+比值. 在阳离子组成端元贡献中,碳酸盐岩贡献最大(54%~79%), 硅酸盐岩(13%~29%)和蒸发盐岩(4%~23%)次之,大气输入(3%~7%)最小. |
| 英文摘要 |
| To investigate the ionic compositions of small lake-watersheds on the Tibetan Plateau, water samples from the brackish lakes (Pung Co (lake), Angrenjin Co and Dajia Co), the freshwater lake (Daggyaima Co), their inflowing rivers and the hot spring (Dagejia Geothermal Field), were collected during July-August 2013. The results showed that the major anions and cations of the brackish lakes were HCO3-, SO42- and Na+, respectively, and the hydrochemical types were HCO3-SO4-Na and HCO3-Na. The major anions and cations of the inflowing rivers and the freshwater lake were HCO3-, SO42- and Ca2+, Mg2+, respectively, and the hydrochemical types were HCO3-Ca, HCO3-Ca-Mg, HCO3-Mg-Ca, HCO3-SO4-Ca and SO4-HCO3-Ca. The major anions and cations of the hot spring were HCO3- and Na+, respectively, and the hydrochemical type was HCO3-Na. Water chemistry in the brackish lakes was primarily dominated by evaporation-crystallization processes, while the inflowing rivers and the freshwater lake were mainly influenced by carbonate weathering, and the hot spring was mainly controlled by hot water-granite interaction. Ca2+was preferentially removed over Mg2+ from the water when carbonate minerals precipitation occured, which resulted in the high Mg2+/Ca2+ molar ratios of the brackish lakes. In the contribution of cation compositions, the largest contribution was carbonate weathering (54%-79%), followed by silicate weathering (13%-29%) and evaperite dissolution (4%-23%), and the smallest was atmospheric input (3%-7%). |
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