FINAL FORMATION OF HIGH-PRESSURE CARBON-MINERALS IN YAMAGUCHI OF JAPAN ISLANDS

Carbon-bearing minerals are significant minerals to show the detailed formation process through high temperature and pressure condition. Dynamic samples will elucidate new information of micro- to macro-carbon minerals, which are main purposes of the present paper [1-4].

Present carbon-bearing samples are used from four sites of Japanese volcanic islands where there are many old carbonates by previous drilled cores [1-4].

Microscopic carbon-bearing minerals are obtained at the following six location-samples [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. 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 shows carbon-bearing grains on feldspar minerals. 6) Points F: Carbon-rich grains can be found separately on feldspar surface. 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 as nano- to micro-diamond have been obtained in this study.

Dynamic process and tube-like texture in this study indicate carbon-separation from carbon-bearing mineral-rocks during shock wave processes of volcano (through previous impact processes from old limestone remained).

Carbon-rich grains of high-pressure form (microscopic diamond) are obtained on the Yamaguchi samples (grain B), where carbon-separation and concentration can be developed along dynamic solidified fluid process with quenching process from previous impact process of old limestone).

References: [1] Miura Y. (2007): Front. Mineral Sci. (Cambridge Univ.), 223. [2] Miura Y. (2008): Am. Geo. Union, pp.1. EOS Trans, AGU, 89 (53), MR33-B1861. [3] Miura Y. (2014): Japan Journal of Geological Society (Kagoshima Universities ), pp.1. [4] Miura Y. (2014): Inter. Mineral. Assoc. 2014 (Johannesburg, SA), 689.