Developing a new method of measuring dissolution rates of silicate minerals using changes in the isotopic ratio of a spiked solution

摘要：

Weathering in the field tends to be incongruent due to the precipitation of secondary phases.However, most laboratory experiments are designed to avoid such precipitation, as it complicates the interpretation of the experimental results. Here we report on a new method that eliminates the effect of secondary phase precipitation on the determination of the dissolution rate of a primary mineral. The dissolution rate determination in the new method is based on measured changes in Si isotopic composition of a spiked solution. The new method significantly improves the accuracy in calculating near-equilibrium dissolution rates. Moreover, combining this method with measured Al concentration enables the determination of precipitation rate of secondary minerals.

作者: L.Harpaz J.Ganor T.D.Bullen

作者单位: Department of Geological and Environmental Sciences, Ben-Gurion University of the Negev,Beer-Sheva, US Geological Survey, Menlo Park, CA, USA

会议类型: 国际会议

会议名称: 第十二届水-岩相互作用国际研讨会(P0roceedings of the 12th International Symposium on Water-Rock Interaction)

会议地点: 昆明

会议语种:英文

页码: 423-426

在线出版日期: 2007-07-31（万方平台首次上网日期，不代表论文的发表时间）