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地质科学  2000, Vol. Issue (3): 325-335    DOI:
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碳酸钙矿物低温化学合成及其同质多象转变矿物学机理研究
周根陶, 郑永飞
中国科学技术大学地球和空间科学系, 合肥, 230026
CHEMICAL SYNTHESIS OF CaCO3 MINERALS AND MINERALOGICAL MECHANISM OF POLYMORPHIC TRANSFORMATION AT LOW TEMPERATURES
Zhou Gentao, Zheng Yongfei
Department of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026
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摘要 通过缓慢分解Ca2+-Mg2+-HCO3--Cl--H2O溶液和以菱锶矿(或碳钡矿、白铅矿)为晶种的附晶生长法,在0-90℃温度范围内定向合成了碳酸钙同质多象变体.矿物合成实验结果表明,随着温度升高,有利于亚稳态文石和不稳定六方方解石的生成;随着溶液中Mg2+离子浓度增大和Ca(HCO3)3溶液浓度减小,均有利于亚稳态文石的形成.以XRD和SEM技术为实验手段,详细研究了碳酸钙同质多象转变过程.结果显示:在流体参与的情况下,文石→方解石和六方方解石→方解石的同质多象转变速率很快,并且其转变的矿物学机理为溶解/再沉淀.
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周根陶
郑永飞
关键词碳酸钙   矿物合成   同质多象转变   矿物学机理     
Abstract: Polymorphs of calcium carbonate were orientedly synthesized in a temperature range 0—90 ℃ by techniques of the slow decomposition of Ca2+-Mg2+-HCO3--Cl--H2O solution and the overgrowth with SrCO3, BaCO3 or PbCO3 as seed crystals. The results suggest that an increase in experimental temperature is favorable to the formation of metastable aragonite and unstable vaterite, and that an increase in Mg2+ concentration or a decrease in Ca(HCO3)2 solution concentration favors the formation of aragonite. The processes and mineralogical mechanisms of polymorphic transformation from aragonite to calcite and from vaterite to calcite were investigated by means of XRD and SEM techniques. The results indicate that the rates of polymorphic transformation from aragonite to calcite and from vaterite to calcite are very fast, and that their mineralogical mechanisms of polymorphic transformation are dissolution-reprecipitation.
Key wordsCalcium carbonate   Mineral synthesis   Polymorphic transformation   Mineralogical mechanism   
收稿日期: 1999-04-07;
基金资助:国家自然科学基金(编号49903001和49453003)和中国科学院专项基金资助项目.
引用本文:   
周根陶,郑永飞. 2000, 碳酸钙矿物低温化学合成及其同质多象转变矿物学机理研究. 地质科学, (3): 325-335.
Zhou Gentao,Zheng Yongfei. CHEMICAL SYNTHESIS OF CaCO3 MINERALS AND MINERALOGICAL MECHANISM OF POLYMORPHIC TRANSFORMATION AT LOW TEMPERATURES[J]. Chinese Journal of Geology, 2000, (3): 325-335.
 
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