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Geothermal Energy

Science – Society – Technology

Fig. 5 | Geothermal Energy

Fig. 5

From: Geothermal energy from the Main Karoo Basin? New insights from borehole KWV-1 (Eastern Cape, South Africa)

Fig. 5

Ripon Formation intersected in borehole KWV-1 (32°14′43.10″ S, 28°35′08.10″ E), Eastern Cape Province, South Africa; a Very fine to fine-grained feldspathic greywacke containing quartz, feldspar, lithic fragments in clay-sized matrix with organic matter. Plane polarized light; b fine-grained lithic arkose containing predominantly quartz, lithic fragments in clay-sized matrix. Plane polarized light; c medium-grained lithic arkose consisting of quartz, feldspar, lithic fragments in clay-sized matrix. Cross polarized light; d siltstone containing abundant quartz and organic matter. Plane polarized light; e sandstones of the Wonderfontein Member between the depths of 1259.50–1269.50 m with sub-vertical fractures (marked by red arrows)

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