Surface microtopographies of sericite crystals formed in different environmental conditions.
Surface microtopographies of sericite crystals formed in different environmental conditions.
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不同环境条件下形成的绢云母晶体的表面微形貌。
DOI：
10.2465/minerj.11.282
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发表时间：
1983
期刊：
影响因子：
--
通讯作者：
I. Sunagawa
中科院分区：
文献类型：
--
作者：
R. Kitagawa;S. Takeno;I. Sunagawa
对广岛、岛根县和山口县许多地方采集的绢云母晶体(001)原生表面进行了电子显微镜金装饰技术的研究。所研究的样品唯一地显示出多边形或圆形的螺旋状生长，并有不同的台阶间隔。对其形态特征与其出现方式的关系进行了批判性分析。结果表明，裂隙中热液直接析出的晶体具有台阶间距较小的圆形生长螺线，而热液交代形成的晶体具有台阶间距较宽的多边形生长螺线的特征。根据对螺旋形态的最新认识，解释了两者之间的差异。
The gold decoration technique of electron microscopy was applied to as-grown (001) surfaces of sericite crystals collected from many localities in Hiroshima, Shimane and Yamaguchi Prefectures.The specimens investigated exclusively exhibited growth spirals of either polygonal or circular forms with varying step separations. The morphological characteristics were critically analysed in relation to their modes of occurrence. It is demonstrated that the crystals directly precipitated from hydrothermal solutions in open fractures are characterized by circular growth spirals with narrower step separations, whereas those formed by hydrothermal metasomatism by polygonal growth spirals with wider step separations. The differences between the two are explained based on the recent understanding on spiral morphology.