张瑞鑫, 易丽, 刘红, 杨思宇. 铁含量对滑石脱水动力学的影响及其地质意义[J]. 地质通报, 2017, 36(6): 1051-1055.
    引用本文: 张瑞鑫, 易丽, 刘红, 杨思宇. 铁含量对滑石脱水动力学的影响及其地质意义[J]. 地质通报, 2017, 36(6): 1051-1055.
    ZHANG Ruixin, YI Li, LIU Hong, YANG Siyu. The effect of iron content on the kinetics of talc dehydration and its geological significance[J]. Geological Bulletin of China, 2017, 36(6): 1051-1055.
    Citation: ZHANG Ruixin, YI Li, LIU Hong, YANG Siyu. The effect of iron content on the kinetics of talc dehydration and its geological significance[J]. Geological Bulletin of China, 2017, 36(6): 1051-1055.

    铁含量对滑石脱水动力学的影响及其地质意义

    The effect of iron content on the kinetics of talc dehydration and its geological significance

    • 摘要: 在常压下研究了2种不同铁含量滑石的原位X射线衍射高温脱水反应。选取粒径2~5μm的2种不同铁含量的滑石样品,在常压、空气氛围下进行了同步辐射原位X射线衍射脱水实验。实验结果表明,铁含量高的滑石脱水温度明显偏低,2个滑石样品在常压下发生明显脱水反应的温度相差达127℃以上。滑石在常压下的脱水动力机制为随机成核和生长机制,符合Avrami方程。将实验数据拟合Avrami方程得出:n=1.669。由实验结果可以推测,不同铁含量的滑石脱水深度可能有几十到上百千米的差别,研究铁含量与滑石脱水动力的相关性对于了解俯冲带浅-中源地震的成因机制具有重要意义。

       

      Abstract: The effect of iron content on the kinetics of talc dehydration was studied with talc of different iron values using in-situ synchrotron X-ray diffraction (XRD).The sample particle size is 2~5μm.The air atmosphere synchrotron radiation in situ XRD de-hydration experiment was carried out under atmospheric pressure.High content of iron obviously resulted in lower dehydration tem-perature.The difference of the dehydration temperature of two samples was above 127℃.The dehydration of talc followed random nucleation and growth mechanism, and fitted Avrami equation, with n being 1.669.The results suggest that the dehydration of differ-ent iron values of talc may occur at the different depths around hundreds of kilometers, so the study was significant to the understand-ing of the genetic mechanism of earthquakes in the subduction zone.

       

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