Dynamic Permeability Related to Greisenization Reactions in Sn-W Ore Deposits: Quantitative Petrophysical and Experimental Evidence

Figure 5

SEM microphotographs and element mapping of Na, K, and Al showing the replacement textures of (a) albite, (b) K-feldspar, and (c) biotite involved during the greisen alteration. Note the development of microporosity in the altered sections of K-feldspar and albite. Abbreviations from Whitney and Evans [45]. Ab: albite; Bt: biotite; Kfs: k-feldspar; Ms: muscovite; Qz: quartz.

(a)

(b)

(c)