Abstract
A new physical emplacement model is proposed for the vertical breccia formation, such as kimberlitic and breccia dykes. They would form in two phases: - A first one, called the implosion phase, leads to the formation of vertical pipes filled by breccia that were formed by a phreatic implosion caused by heating of water in sediments as a result of an ascending lava front. The second one, called the fluidization phase, leads to breccia evolution and characterization of them as pipe breccia. Fluidization can be explained only by the great volume of moist discharged during the initial implosive phase, even in the contribution of volcano-magmatic gases is not considered. Both phases are dimensioned with basis on a geological-grannulometric study made over breccia pipes and a breccia dyke of the Lodêve region, France. All the emplacement stages are calculated and the results are compared with equivalent cases measured on recent volcanic occurrences.
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