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Fluid inclusion and geochemical evidence for fluid mixing in the genesis of Ba-F (Pb-Zn) lodes of the Spanish Central System

Published online by Cambridge University Press:  05 July 2018

F. Tornos ,
C. Casquet ,
J. Locutura  and
R. Collado
F. Tornos
Affiliation:
Instituto Tecnológico Geominero de España, Rios Rosas 23, 28003 Madrid, Spain
C. Casquet
Affiliation:
Facultad de Ciencias Geológicas, Universidad Complutense, 28004 Madrid, Spain
J. Locutura
Affiliation:
Instituto Tecnológico Geominero de España, Rios Rosas 23, 28003 Madrid, Spain
R. Collado
Affiliation:
Facultad de Ciencias Geológicas, Universidad Complutense, 28004 Madrid, Spain
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Abstract

Fluid inclusion data and geochemical evidence lead to a genesis of Ba-F (Pb-Zn) lodes of the Spanish Central System as related to fluid mixing of hot (>300 °C), low saline (<0.6 molal), Na-K deep fluids and cool (<100 °C), oxidized, more saline (>2.8 molal), Na-K-Ca-Mg brines of phraeatic origin. Ore formation took place at relative low depth and temperatures (from 270 to 120 °C) in a regime of increasing fO2, (Ca + Mg)/Na ratio and pH of the fluids towards the surface. Such evolution destabilizes the chloride metal complexes, allowing for the precipitation of Zn and Pb carried by the deep solution.

Vertical fluorite-baryte zonation is explained in terms of mineral solubilities. Fluorite deposition in the deeper mineralized zone is related to a slight increase of mCa2+ of the fluid in the lower part of the fluid mixing zone; further increase of mCa2+ and mMg2+ towards the surface promotes fluorite dissolution. Increase of fO2 in the shallow part of the hydrothermal system promotes the oxidation of , resulting in baryte formation.

We propose an ore genesis related to fluid mixing in shallow hydrothermal systems associated with an extension of Permo-Triassic age. Such interpretation is in agreement with the present day ideas for the genesis of many of the Ba-F deposits in the Hercynian Belt of Europe.

Keywords

fluid inclusionsfluid mixingBa-F lodesSpanish Central System
Type
Fluid Inclusion Studies
Information
Mineralogical Magazine , Volume 55 , Issue 379 , June 1991 , pp. 225 - 234
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1991

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