Sr and Nd isotope data from the fluorspar district of Asturias, northern Spain |
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| Authors: | V. S nchez, M. Corbella, J.M. Fuenlabrada, E. Vindel,T. Martí n-Crespo |
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| Affiliation: | aDpto. Cristalografía y Mineralogía, F. C.C. Geológicas, Universidad Complutense, 28040-Madrid, Spain;bDepartament de Geologia, Facultat de Ciències, Universitat Autònoma de Barcelona, 08193-Bellaterra, Spain;cC.A.I. de Geocronología, Universidad Complutense, 28040-Madrid, Spain;dDpto. Matemáticas y Física Aplicadas y Ciencias de la Naturaleza, Univ. Rey Juan Carlos, 28933-Móstoles, Spain |
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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. |
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| Keywords: | Fluorite Sr isotopes Sm– Nd isochron Hydrothermal fluids |
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