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首页> 外文期刊>Contributions to Mineralogy and Petrology >Morphology of intergranular pores and wetting angles in pelitic schists studied by transmission electron microscopy
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Morphology of intergranular pores and wetting angles in pelitic schists studied by transmission electron microscopy

机译：透射电子显微镜研究胶质片岩晶间孔的形态和润湿角

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摘要

In pelitic schists composed mainly of quartz and albite grains, the morphology of intergranular pores, which were filled with water, was studied by transmission electron microscopy (TEM). Although some pores are defined by crystallographic planes (F-face), most of their form has an ideal shape determined by interface tensions between grains and fluid. High-resolution TEM observations demonstrate that pore-free regions at grain boundaries are tight even at the nanometer scale, showing that the wetting angle is larger than 0° in this rock. The pore distribution in two-grain junctions can be compared to a "necklace microstructure" developed by instability of a fluid film along the boundary induced by microcracking. Wetting angles for pores located at grain edges of quartz and albite decrease in the order albite/albite, quartz/quartz, and quartz/albite. The quartz/quartz wetting angle in a calcite-free sample is smaller than that in a calcite-containing sample. This angle also changes due to grain misorientation. Our results confirm that solid–solid and solid–fluid interfacial energies control the geometry of intergranular fluid in natural rocks.
机译：在主要由石英和钠长石晶粒组成的片状片岩中，通过透射电子显微镜（TEM）研究了充满水的晶间孔的形态。尽管某些孔是由晶体学平面（F面）定义的，但它们的大多数形式都具有理想的形状，该形状由晶粒与流体之间的界面张力确定。高分辨率TEM观察表明，即使在纳米尺度上，晶界处的无孔区域也很紧密，这表明该岩石的润湿角大于0°。可以将两晶粒接合处的孔分布与由微裂纹引起的沿边界的流体膜的不稳定性所形成的“项链微结构”进行比较。位于石英和钠长石晶界的孔的润湿角按钠长石/石棉，石英/石英和石英/石棉的顺序减小。无方解石样品中的石英/石英润湿角小于含方解石样品中的石英/石英润湿角。该角度也由于晶粒取向错误而改变。我们的结果证实了固-固和固​​-液界面能控制着天然岩石中晶间流体的几何形状。

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  • 来源
    《Contributions to Mineralogy and Petrology》 |2001年第5期|613-622|共10页
  • 作者

    Takehiko Hiraga; Osamu Nishikawa; Toshiro Nagase; Mizuhiko Akizuki;

  • 作者单位

    Department of Geology and Geophysics University of Minnesota Minneapolis MN 55405 USA;

    Institute of Geology and Paleontology Faculty of Science Tohoku University Aoba-yama Aoba-ku Sendai 980–8578 Japan;

    Institute of Mineralogy Petrology and Economic Geology Faculty of Science Tohoku University Aoba-yama Aoba-ku Sendai 980–8578 Japan;

    Institute of Mineralogy Petrology and Economic Geology Faculty of Science Tohoku University Aoba-yama Aoba-ku Sendai 980–8578 Japan;

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