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Fig. 5 | Geothermal Energy

Fig. 5

From: Matrix permeability of reservoir rocks, Ngatamariki geothermal field, Taupo Volcanic Zone, New Zealand

Fig. 5

Cross-polarised (left) and plane-polarised (right) photomicrographs of a, b shallow-, mixed pore-, and microfracture-dominated lapilli tuff with recrystallised pumice clasts, and partially precipitated microfractures with altered margins (thin section from NM2_1350B_01 Wyering et al. 2014); c, d intermediate depth, pore-dominated lapilli tuff with large pores infilled with epidote and clay, most original textures are no longer visible due to re-crystallisation (thin section from NM11 1.2_01 Wyering et al. 2014); e, f deep, microfracture-dominated lapilli tuff showing recrystallization textures, quartz vein, and resorption of quartz crystal in pumice clast (thin section NM8A C1_4_02 from Wyering et al. 2014); g, h deep, microfracture-dominated tonalite with quartz and feldspar phenocrysts showing resorption (quartz) and recrystallization (feldspar) (thin section NM8A C2_1_1 from Wyering et al. 2014)

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