Water geochemistry controlled by carbonate dissolution: a study of the river waters draining karst-dominated terrain, Guizhou Province, China

详细信息	查看全文 | 推荐本文 |

• 作者：Han ; Guilin ; Liu ; Cong-Qiang
• 关键词：Karst ; Water chemistry ; Catchment weathering rate ; Carbonate weathering
• 刊名：Chemical Geology
• 出版年：2004
• 期刊代码：12_00092541
• 类别：ear
• 出版时间：March 15, 2004
• 卷：204
• 期：1-2
• 页码：1-21
• 文件大小：1.66 M

摘要

Concentrations of major ions and Sr, and Sr isotopic compositions of two major river systems (Wujiang River and Yuanjiang River) in karst-dominated regions, and during winter were measured. The rivers and their tributaries have high total dissolved solid concentrations, with TZ⁺ ranging from 2.1 to 6.3 meq/l, which are significantly higher than that of the global river average. Calcium and HCO₃⁻, followed by Mg²⁺ and SO₄²⁻, dominate the chemical composition of major ions in the river waters. Both Na⁺+K⁺ and Cl⁻+Si account for 5–10%of the cations and anions, respectively. The waters of the Wujiang River have high Sr²⁺ concentrations and lower ⁸⁷Sr/⁸⁶Sr ratios (0.7077–0.7110), while those of the Qingshuijiang River, one of two major tributaries of the Yuanjiang River system, show higher Sr isotopic ratios (0.7090–0.7145) and low Sr concentrations.