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首页> 外文期刊>Contributions to Mineralogy and Petrology >Interfacial energies for quartz and albite in pelitic schist
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Interfacial energies for quartz and albite in pelitic schist

机译：胶体片岩中石英和钠长石的界面能

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摘要

Interfacial energies of quartz/quartz (qz/qz), albite/albite (ab/ab), and quartz/albite (qz/ab) boundaries in low-grade pelitic schist were determined based on measured values of dihedral angles. Three kinds of microstructures were investigated, and the interfacial energies were obtained in two independent ways. (1) Relative values of interfacial energy were calculated from dihedral angles formed at quartz and albite triple junctions. (2) Subgrain boundary energy was calculated using the Read–Shockley theory for a boundary connected to an intergranular pore. Dihedral angles formed at the corners of intergranular pores were measured. From the interfacial tension balance equation, the value of the qz/qz grain boundary energy was then obtained. (3) Dihedral angles formed at intersections of either pericline or albite twin boundaries with either ab/ab or qz/ab boundaries were measured. The twin boundary energy was calculated based on a previously derived equation using Landau potential, twin wall thickness, and critical temperature for a phase transition in albite. With a modified interfacial tension balance equation for a twin boundary fixed to a facet orientation, the interfacial energies of ab/ab and qz/ab boundaries were obtained. Energies obtained by methods of (2) and (3) are in good agreement. The interfacial energies for qz/qz, ab/ab, and qz/ab boundaries obtained in this study are 270±110, 300±150, and 250±120 mJ/m2, respectively.
机译：根据二面角的测量值确定低品位片岩片岩中石英/石英（qz / qz），钠长石/ bitbit（ab / ab）和石英/ bitbit（qz / ab）边界的界面能。研究了三种微观结构，并以两种独立的方式获得了界面能。 （1）界面能的相对值是根据在石英和钠长石三重结处形成的二面角计算的。 （2）使用Read-Shockley理论计算与晶间孔相连的边界的亚晶界能。测量在晶间孔的角处形成的二面角。从界面张力平衡方程式，得到qz / qz晶界能量的值。 （3）测量了在珍珠岩或钠长石孪晶边界与ab / ab或qz / ab边界相交处形成的二面角。基于先前导出的方程，使用朗道势，孪晶壁厚度和钠长石相变的临界温度，计算了孪晶边界能。利用修正的界面张力平衡方程，将孪晶边界固定为刻面取向，获得了ab / ab和qz / ab边界的界面能。通过（2）和（3）方法获得的能量非常吻合。本研究获得的qz / qz，ab / ab和qz / ab边界的界面能分别为270±110、300±150和250±120 mJ / m2 。

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  • 来源
    《Contributions to Mineralogy and Petrology》 |2002年第6期|664-672|共9页
  • 作者

    Takehiko Hiraga; Osamu Nishikawa; Toshiro Nagase; Mizuhiko Akizuki; David L. Kohlstedt;

  • 作者单位

    Department of Geology and Geophysics University of Minnesota Minneapolis MN 55455 USA;

    Institute for Study of the Earth's Interior Okayama University at Misasa Tottori 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;

    Department of Geology and Geophysics University of Minnesota Minneapolis MN 55455 USA;

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