Geoquímica (Ba, Mn, Sr, Pb, y Zn) de la fracción soluble e insoluble en los carbonatos encajantes de la mineralización (Zn-Pb) del sector La Florida-Reocín (Cantabria)implicaciones genéticas

Abstract

In the present work, Ba, Mn, Sr, Pb and Zn contents of soluble and insoluble fractions in carbonate rocks (limestones and dolomites) have been determined. These rocks form the host-rocks of very important lead-zinc mineralizations in western Cantabria (La Florida-Reocin sector). The results show an important increase (except in strontium- soluble fraction-) in all analyzed elements for calcite-dolomite transformation, both soluble and insoluble fractions. This increase, particulary in zinc contents (16 ppm and 113 ppm in soluble fraction of limestones and dolomites, and 483 and 1.072 ppm in insoluble fraction of limestones and dolomites, respectively) means that dolomitization fluids were rich in this element. This hypothesis, linked whith the important role of zinc in the mineralizations (sphalerite), reveals a closed relation among dolomitization and mineralization solutions. Perhaps, these solutions were the same that firstly produced the dolomitization and later the mineralization.