Abstract
The iron ore deposit of Marquesado (Spain) has been considered as a typical metasomatic substitution deposit (Type eight of Blondel's classification). Recent investigations have completely modified this point of view: stratigraphic analysis and paleogeographic data allow to consider the ore as a syngenetic formation. The author examines the possibility of a detritical sedimentary and of a volcanic-sedimentary origin. The conclusion is reached to propose a paleokarst origin of the orebody.
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