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Geothermal Energy

Science – Society – Technology

Fig. 7 | Geothermal Energy

Fig. 7

From: Structural control of the graben fault on hydrothermal alteration in the Cerro Pabellón geothermal system (Andean Cordillera, Northern Chile)

Fig. 7

a Plot of structural formulae of trioctahedral clays in a diagram of XFe versus Si for CP5A and CP2A wells (XFe = Fe/(Fe + Mg). The average structural formulae are presented in Additional file 1: Tables S1, S2, S3. In this figure all the samples are represented with a relative structure containing 14 oxygen atoms and assuming that the total iron content was composed of Fe2 + . Theoretical compositions of clinochlore, corrensite, and saponite are provided for reference. b Chemical compositions of K-rich and Ba-rich feldspars at 445 m depth in CP5A well plotted in a Na–K-Ba ternary diagram. Representative analyses are described in Table 1. Theoretical compositions of adularia and celsian are given for reference (crosses). c representative SEM–EDS spectrum of calcium arsenate mineral observed at 470 m depth in CP5A well

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