The fundamental mechanism in the formation of these structures is mainly selective replacement of primary rock by hydrothermal fluids but also of previous generations of hydrothermal dolomite along fractures, layers of higher permeability, stylolites and others.
The sample shown is from the MVT deposit of San Vicente in Peru.
- V. Badoux, R. Moritz & L. Fontboté, The Mississippi Valley-type Zn-Pb deposit of San Vicente, Central Peru: an Andean syntectonic deposit, In: A. Piestrzyñski et al. (eds. 2001), Mineral deposits at the beginning of the 21st century, Balkema, Amsterdam, p. 191-195.