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Microstructural Intergrowth of Margarite and Chlorite in a Schist from Unkyori formation of Miwon Area  

이승준 (충북대학교 지구환경과학과)
안중호 (충북대학교 지구환경과학과)
Publication Information
Journal of the Mineralogical Society of Korea / v.16, no.3, 2003 , pp. 255-263 More about this Journal
Abstract
Margarite, occurring in an Unkyori Formation of Miwon area, Chungcheongbukdo, South Korea, was investigated using a high-resolution transmission electron microscope (HRTEM) to reveal the microstructural intergrowth textures of margarite. HRTEM images of margarite, which was previously confirmed to have intergrowth textures by petrographic microscope and back-scattered electron images, show that chlorite occurs as thin packets of layers interlayered within margarite crystals, and intercalated chlorite layers are intergrown irregularly in areas as a few hundred angstroms thick slabs or isolated chlorite unit layers. Margarite crystals observed by HRTEM consist of a well-ordered 2M polytype, and electron diffraction pattern shows no prominent streaking along the 001 (or $c^{*}$) direction, indicating that there is no significant stacking disorder in margarite. Intercalated extra brucite-like layers, which are approximately 5 $\AA$ thick, are observed locally within margarite crystals. Insertion of such extra brucite-like layer at the interlayer of margarite would result in a chlorite-like structure unit. (001) margarite layers are parallel to (001) of chlorite, and margarite layers are not extended from (001) of chlorite, indicating that margarite was apparently produced through a dissolution-precipitation mechanism.m.
Keywords
high-resolution transmission electron microscope; margarite; chlorite; extra brucite-like layer; electron diffraction pattern;
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