Abstract
To explain the mechanism involved in the formation of copper porphyries, a new concept is brought forward based on magmatic pulsations providing the forces necessary to drive hydrothermal and mineralizing stations, and also to produce structures. . . The basic type of breccia particular to hydrothermal developments is rupture breccia, formed by hydraulic ramming of hydrothermal solutions into overlying rocks. This breccia when heaved up or subsided by magmatic pulsations can be changed. . . into subsidence, heave, kneaded, or milled breccias. The burst and late-magmatic breccias are also caused, though more indirectly, by magmatic pulsations.
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