processus exhalatif

OBS: Par analogie avec ""gîte exhalatif"" (voir fiche).

CONT: Two principal genetic models have been considered for the origin of iron-formations and the associated hydrolithic stratafer sediments. One emphasizes volcanogenic and hydrothermal effusive or exhalative processes and the other hydrogenous-sedimentary processes with derivation of the iron, silica and other constituents by deep weathering of a landmass.