Microtexture of serpentinites from Oshima Peninsula, Fukui Prefecture

Abstract

Pseudomorphic textures of serpentinites are important to estimation of original rocks, consideration of serpentinization process and so on. We researched microtexture of serpentinites in Oshima peninsula by XRD, SEM-EDS and TEM. Mesh texture and vein texture are observed in these serpentinites. Vein texture contain polygonal serpentine, magnetite and hydrotalcite. Mesh rim near vein texture consist of three layers; outer rim, inner/outer rim boundary and inner rim. Awaruite grains are observed along inner/outer rim boundary and core/rim boundary. Serpentines contain few Al, Ni and a few Fe. By these results, it is expected that formation
of these serpentinites has complicated process.