Publication: Sr and Nd isotope data from the fluorspar district of Asturias,
northern Spain
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Publication Date
2006
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Elsevier Science B.V.
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Abstract
The origin and age of the hydrothermal fluids related to the precipitation of fluorite, barite and calcite in the Villabona, La
Collada and Berbes localities (Asturias fluorspar district, N Spain) have been evaluated from Sr and Nd radiogenic isotopes. Sr
isotope data (87Sr / 86Sr=0.7081 to 0.7096) are compatible with mixing between seawater and a more evolved groundwater that
interacted with the basement. From Nd isotopes in fluorite, an isochron age of 185±29 Ma (Lower Jurassic) was obtained,
consistent with other hydrothermal events in the Iberian Peninsula and Europe. These constraints are essential to proceed with a
quantitative model for the genesis of the mineralization that includes fluid and heat flow together with reactive transport of solutes.