Estimation of Saturation Index for the Precipitation of Secondary Minerals during Water-Rock Interaction in Granite Terrains
详细信息
- 责任者：Dou Shunmei (Guangzhou Institute of Geochemistry ; Chinese Academy of Sciences ; Guangzhou 510640 ; China) ; Chen Fanrong
- 刊名：Geochimica
- 出版年：2010
- 卷期：39(4)
- 关键词：水岩作用 ; water-rock interaction ; 沉淀作用 ; precipitation
- 页码：p.326-336
- 图表：3 illus., 2 tables, 18 refs.
- 分类号：0600
- issnNo：ISSN0379-1726
- isbnNo：CN44-1398/P
摘要
In this study, saturation indices (SI) for the precipitation of various minerals that would form as secondary phases under ambient conditions, are estimated by using the geochemical simulation software of PHREEQC 2.15 and the database of ll nl.dat based on the geological and hydro-geochemical data from Japanese and Canadian granite regions. The results indicate that calcite is subjected to dissolution and precipitation due to its strong chemical activity, and is expected to precipitate at SI≈0.5. Goethite is considered to be a Fe sink in groundwater, the calculated SI value is closely associated with the pe value, and precipitates at SI = 4.0 ± 0.5. Combined with thermodynamic constrains on secondary clay minerals, the SI values for the precipitation of kaolinite, illite, Ca-montmorillonite and Na-montmorillonite are estimated to be 4.0 ± 0.5, 4.5 ± 0.5, 4.3 ± 0.5 and 4.3 ± 0.5, respectively.
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