6:15 PM - 7:30 PM
[SCG58-P13] In-situ observation of formation process of carbon-rich minerals in several sites of Yamaguchi,Japan.
Keywords:High-pressure carbon, Basalt, In-situ observation, Phologopite, Fluid solidified, Tube-like texture
2. Carbon-rich minerals from Yamaguchi Prefecture: Present carbon-bearing samples are used from three sites (Yamaguchi) and one site (Shimane) to compare dynamic formation processes[1-4].
3. Microscopic observation of carbon-containing minerals: Microscopic carbon-bearing minerals are obtained at the following six location-samples as follows [2-4].
1) Point A: Historical sample-site of basalt with phlogopite and feldspar contains microscopic carbon-bearing grains quenched as flake texture found in this study.
2) Points B: Basalt with phlogopite and feldspars shows more detailed grains and texture with tube-shaped texture with progressive change of carbon-contents. The present observation is new result to be found as carbon-separated concentrations during fluid-solid reactions shown as flake quenched texture.
3) Points C: Basalt phlogopite mica and feldspar shows carbon-bearing materials with quenched flake texture and tube-like textures.
4) Points D: Basalt with phlogopite minerals contains carbon-bearing grains with flake and tube-like textures.
5) Point E: Basalts with feldspar minerals (without any phlogopite) shows carbon-bearing grains on feldspar minerals.
6) Points F: Carbon-rich grains can be found separately on feldspar surface (without phlogopite).
4. Identification of carbon minerals: Carbon-rich grains from point B have been investigated by X-ray diffraction and Raman Spectroscopy, where the characteristics of high pressure-type carbon minerals(diamond-like) have been obtained in this study.
5. Formation of high-pressured carbon minerals: Dynamic process and tube-like texture indicate carbon-separation from carbon-bearing minerals during shock wave processes of volcano and impact process.
6. Summary: Carbon-rich grains of high-pressure form (microscopic diamond) are obtained on the Yamaguchi samples (grain B) compared with other samples in Japan, where carbon-separation and concentration can be developed along solidified tube-like and fluid-like process with quenching found in the study.
References:  Miura Y. (2007): Front. Mineral Sci. (Cambridge Univ.), 223.  Miura Y. (2008): Am. Geo. Union, pp.1. EOS Trans, AGU, 89 (53), MR33-B1861.  Miura Y. (2012-2014): Japan Journal of Geological Society (Osaka, Tohoku and Kagoshima Universities), pp.1.  Miura Y. (2014): Inter. Mineral. Assoc. 2014 (Johannesburg, SA), 689.