Abstract

Study of the barite veins in the Mende-Marvejols region, Lozere, France, shows two types of mineralization, called here the "socle" (basement complex) type, probably Hercynian, and the "couverture" (sedimentary cover) type, post-Liassic. The latter is considered to be the result of reworking of the earlier deposits by ascending solutions, probably in connection with Tertiary volcanism. Complex chlorides, derived from saliferous Triassic beds, seem to have played an important role in the process. This interpretation, which is based on Schneiderhoehn's theory of secondary hydrothermal deposits, can be applied to all the lead, zinc,and barite deposits of the peripheral zone of the Central Massif.

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