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Geothermal Energy

Science – Society – Technology

Fig. 14 | Geothermal Energy

Fig. 14

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

Fig. 14

a Calculated concentration changes and standard deviation for major, trace, and rare-earth elements with respect to the different alteration facies. The concentration changes were calculated using the average chemical composition of the Teziutlán andesite unit. b Plot depth vs. Eu/Eu* after Carrasco-Núñez et al. (2017b) and plot ∑LREE/(Eu/Eu*) vs. ∑HREE showing clearly lower Eu/Eu* ratios for the rhyolitic lavas. d Plot Ti/SiO2 vs. Eu/Eu* showing different groups for rhyolites, silicified samples, and the remaining lavas of the pre-caldera group

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