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Figure 5.
Magma emplacement model for a complex feeder-dike system in monogenetic scoria cones. (A) Magma encounters a stress barrier and intrudes a steeply dipping dextral-normal N-S preexisting fault parallel to the least principal stress (σ3). (B) Magma bifurcates into 5–6 E-W feeder dikes (orthogonal to 1–4 feeder dikes) through self-propagating fractures coinciding with the stress field at the time of the eruption (normal to the least principal stress).
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