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Fig. 4 | Geothermal Energy

Fig. 4

From: Modeling fracture cementation processes in calcite limestone: a phase-field study

Fig. 4

a Computational domain with an initial crack width of \(100 \Delta x\). Simulated bitaxial crystal growth for different values of crack opening rates: b Slow crack opening rate \(\Delta x / 1000 \Delta t\), c moderate crack opening rate \(\Delta x / 200 \Delta t,\) and d fast crack opening rate \(\Delta x / 100 \Delta t\). The progression is shown at representative simulation time steps. The selected crystals in the resulting vein morphologies are illustrated. e Fibers with almost equal width. f Elongate-blocky crystals with increasing width. g Crystals forming euhedral flat facets due to availability of sufficient pore space for crystal growth

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