Fig. 3From: The impact of hydrothermal alteration on the physiochemical characteristics of reservoir rocks: the case of the Los Humeros geothermal field (Mexico)Scans of polished plugs and corresponding thin section images (XPL) from selected outcrop samples. a–h represent the Teziutlán andesite unit and i–p represent the Miocene Cuyoaco andesite unit. Cpx, Clinopyroxene; Hbl, hornblende; p, pores; Pl, plagioclase; Opx, OrthopyroxeneBack to article page