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Geothermal Energy

Science – Society – Technology

Fig. 5 | Geothermal Energy

Fig. 5

From: The impact of hydrothermal alteration on the physiochemical characteristics of reservoir rocks: the case of the Los Humeros geothermal field (Mexico)

Fig. 5

Low-temperature (a–d), moderate-temperature (e–h) to high-temperature propylitic alteration (i to l) as well as advanced silicification (m–p) with relicts of original phenocrysts and secondary porosity (black patches) observed in thin sections with PPL = (b) and (f) and XPL = (c), (d), (g), (k), and (n) as well as SEM images of selected altered andesitic lavas displayed as (h), (l), (o), and (p). Cal calcite; Chl chlorite; Ep, epidote; Czo, clinozoisite; Fsp, feldspar; Kfs, K-feldspar; p, pores; Pl, plagioclase; Py, pyrite; Qz, quartz

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