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Study on smectite-to-illite transformation mechanism

蒙脱石向伊利石转化机理研究

基本信息

批准号：
16540437
负责人：
INOUE Atsuyuki
金额：
$ 2.37万
依托单位：
Chiba University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

项目摘要

Study on smectite-to-illite transformation mechanism, using the core samples IT-2 from the Kakkonda geothermal field, has been successfully completed and the results have been published in five papers of international and national journals. In this year, we worked on motmorillonite-to-beidellite transformation at Bouillante geothermal field, Guadeloupe as an application of our current model of smectite-to-illite transformation mechanism. Detailed XRD, FTIR and chemical analyses clearly demonstrated a transition from montmorillonite to beidellite with increasing depth and temperature via interstratification of the two layers. However this transition was not explained by a thermally controlled beidellitization but control of solution composition related to the precipitation of clays, based on the carbon and oxygen isotopes data analysis. This conclusion is reasonably accepted from the viewpoint of our current model of smectite-to-illite transformation mechanism. This result has been submitted to an article of American Mineralogist co-authored with French colleagues.In the next step, it is important to understand the precipitation dynamics of clay minerals in water-rock interaction. It is not easy that experimental works undertakes to understand the behavior of silicate ions in solution. Instead of crystallization of silicates, thus, we started working on crystallization process of iron oxyhydroxide minerals, especially focusing on understanding of the role of anions in the formation of FeOOH minerals. We have interested results on this subject and published two papers.

利用卡孔达地热田的IT-2岩心样品成功完成了蒙皂石向伊利石转化机制的研究，研究结果已在国际和国内期刊上发表了五篇论文。今年，我们在瓜德罗普的Bouillante地热田开展了蒙脱石向贝得石转化的工作，作为我们目前蒙脱石向伊利石转化机制模型的应用。详细的XRD、FTIR和化学分析清楚地表明，随着深度和温度的增加，通过两层的夹层，蒙脱石向贝得石的转变。然而，这种转变不是由热控制的贝得石化，但控制有关的粘土沉淀的溶液组成，根据碳和氧同位素数据分析。这一结论是合理的观点，我们目前的蒙皂石到伊利石转化机制模型。这一结果已提交给美国Mineralogist与法国同事合著的一篇文章，下一步，了解粘土矿物在水-岩相互作用中的沉淀动力学至关重要。要了解硅酸盐离子在溶液中的行为并不容易。因此，我们开始研究羟基氧化铁矿物的结晶过程，而不是硅酸盐的结晶过程，特别是专注于了解阴离子在FeOOH矿物形成中的作用。我们对这个问题有兴趣的结果，并发表了两篇论文。