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Micropores and mass transfer in the formation of myrmekites

ミルメカイト形成時の微小孔および物質移動

湯口 貴史*; 湯浅 春香*; 五十公野 裕也*; 中島 和夫*; 笹尾 英嗣  ; 西山 忠男*

Yuguchi, Takashi*; Yuasa, Haruka*; Izumino, Yuya*; Nakashima, Kazuo*; Sasao, Eiji; Nishiyama, Tadao*

本研究は花崗岩体内で広く産出するミルメカイトを研究対象とし、その解析手法と生成に関する知見を提示した。本研究では、瑞浪超深地層研究所周辺に分布する土岐花崗岩体のミルメカイト中に微小孔を見出した。これはミルメカイト生成時に体積が減少していることを示す。その結果から(1)ミルメカイト生成に際して体積変化を考慮した元素移動メカニズム、(2)ミルメカイト化に際して微小孔の生成要因、(3)熱水の化学的特徴の時間的を論じた。微小孔は熱水や地下水の拡散経路となり得るため、将来的な物質移動を考える上でも有用な知見となる。

The methodology and interpretations in this study provide new insights into the mechanism of myrmekite formation in a granitic system. The presence of micropores in the myrmekites and this study clarified that the genesis of micropores is related to the formation of myrmekites in the Toki granite. The results led to an increased understanding of (1) an estimate of mass transfer between the reactant and product minerals, and the inflow and outflow of components with consideration of the volume change due to micropore formation, (2) the factor controlling the formation of micropores during myrmekitization, and (3) the sequential variations in the hydrothermal fluid chemistry during sub-solidus conditions. The micropores act as a migration pathway for hydrothermal fluid and thus enhance the mass transfer within a granitic body starting with the myrmekite formation and continuing through the present day and into the future.

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