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Fig. 5 | Geothermal Energy

Fig. 5

From: The characterisation of an exhumed high-temperature paleo-geothermal system on Terre-de-Haut Island (the Les Saintes archipelago, Guadeloupe) in terms of clay minerals and petrophysics

Fig. 5

Scanning Electron Microscopy (SEM) image of a small zone of altered sample 15.142 showing a total replacement of primary volcanic minerals and groundmass by K-phyllosilicates. Crystallization of K-phyllosilicates is posterior to the development of microfractures as they partially bond them. Intercrystalline porosity is also encountered between K-phyllosilicate crystallites

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