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Fig. 9 | Geothermal Energy

Fig. 9

From: On the geothermal potential of crustal fault zones: a case study from the Pontgibaud area (French Massif Central, France)

Fig. 9

Three-dimensional observations of the planar and matrix porosity of one sample taken from the Pontgibaud fault zone. The red color of figures a, b corresponds to mineralization (lead sulphides). The yellow color of figures a, b corresponds to the planar porosity located on the fracture walls. The yellow color of figure c could correspond to the matrix porosity. The resolution of figures ac is, respectively, 25, 25 and 4 μm

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