Skip to main content

Science – Society – Technology

Fig. 4 | Geothermal Energy

Fig. 4

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

Fig. 4

Scans and photographs of selected reservoir samples and corresponding thin sections with PPL = (b) and (d) and XPL = (f), (h), (j), and (l). a to d represent the upper Xáltipan ignimbrite and andesite/ignimbrite breccias of the caldera group, e to l represent mafic to rhyolitic lavas of the upper part of the pre-caldera group predominantly affected by argillic alteration. Cal, calcite; Chl, chlorite; Cpx, Clinopyroxene; Hem, hematite; Mag, magnetite; p, pores; Pl plagioclase; Qz, quartz

Back to article page