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Fig. 5 | Geothermal Energy

Fig. 5

From: Detailed descriptions of the lower-middle Triassic and Permian formations using cores and gamma-rays from the EPS-1 exploration geothermal borehole (Soultz-sous-Forêts, Upper Rhine Graben, France)

Fig. 5

Photo board of the cores from the lower Muschelkalk, with the Box associated with the cores; this package is correlated to a formation (with the names and boxes concerned). All the cores have a diameter of 78 mm. Box 30 corresponds to the Couches à Myophoria Orbicularis composed of massive dolomite, alternating between dolomicrite and dolosparite, with marl content. Box 35 corresponds to the Schaumkalk composed of dolomite (generally dolomicrite) alternating with clays (in dark, wavy and bioturbated). Boxes 43 and 45 correspond to the Wellenkalk formation, where dolomite alternates with millimetric marls and silty marls, with the whole facies as wavy to lenticular bedding interpreted as tidal deposits. The lower part of the formation (Box 45) marks the passage from wavy to lenticular bedding. Boxes 50 and 56 correspond to the Wellenmergel formation, a centimeter-scale dolomite laminae interbedded with centimetric bioturbated marls. Box 69 corresponds to the Couches à Myacites formation composed of marls intercepted by fine dolomites, sandy dolomites, and sometimes sandstone beds. Box 70 corresponds to the Grès Coquillier composed of sandstones with few clayey and silty marls levels

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