Sr and Nd isotope data from the fluorspar district of Asturias, northern Spain

• Published in: Journal of geochemical exploration Vol. 89; no. 1; pp. 348 - 350
• Main Authors: Sánchez, V., Corbella, M., Fuenlabrada, J.M., Vindel, E., Martín-Crespo, T.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-04-2006
• Subjects: Fluorite; Hydrothermal fluids; Sm–Nd isochron; Sr isotopes; Hydrothermal fluids; Fluorite; Sm–Nd isochron; Sr isotopes
• ISSN: 0375-6742; 1879-1689
• DOI: 10.1016/j.gexplo.2005.11.058

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.