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Analysis of the distribution of microfractures and micropores within granitic rock using simultaneous polarization-fluorescence microscopy

偏光蛍光同時観察法を用いた花崗岩中の微小割れ目と微小孔の分布解析

湯口 貴史*; 宇佐見 茜*; 石橋 正祐紀

Yuguchi, Takashi*; Usami, Akane*; Ishibashi, Masayuki

微小割れ目や微小孔の分布を知ることは、岩盤中の物質移行特性を特徴づけるために重要である。本論では、顕微鏡スケールの微小空隙の分布を把握する方法として、偏光蛍光同時観察法を提案した。この方法は、蛍光染料を使って作成された岩石薄片に対し、蛍光ランプを装着した偏光顕微鏡観察を行うことによって、微小空隙の分布と岩石学的特徴を同時にかつ効率的に把握するものである。なお、この方法で把握した微小空隙の分布は、電子顕微鏡観察の結果と一致することを確認した。

The analysis of the distribution of microfractures and micropores is important to accurately characterise mass transfer within a rock body. In this paper, a new "simultaneous polarization-fluorescence microscopy" method is presented, which can be used to analyse the distribution of microscopic voids, including microfractures and micropores, in granitic rock. In this method, thin sections prepared with fluorescent dye are analysed under a polarizing microscope equipped with a fluorescent reflected light source. Using both the transmitted and the fluorescent light sources, both the distribution of microfractures and micropores, and petrographic characteristics (mineral occurrences) can be determined efficiently and simultaneously. The distribution of microfractures and micropores observed in images of granites obtained using simultaneous polarization-fluorescence microscopy is consistent with the distribution observed in backscattered electron images.

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