The Hiendelaencina epithermal silver-base metal district,Central Spain: Tectonic and mineralizing processes |
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Authors: | A. Concha R. Oyarzun R. Lunar J. Sierra M. Doblas J. Lillo |
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Affiliation: | (1) Departamento de Cristalografia y Mineralogía, Facultad de C. C. Geológicas, Universidad Complutense, 28040 Madrid, Spain;(2) Departamento de Geodinamica, Facultad de C.C. Geológicas, Universidad Complutense, 28040 Madrid, Spain;(3) Department of Earth Sciences, The University of Leeds, LS2 9JT Leeds, UK |
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Abstract: | The northeastern sector of the Spanish Central System hosts important Stephanian-Permian silver-base metal epithermal mineralizations defining the so-called Hiendelaencina District. The overall geotectonic evolution of this region indicates a major late Variscan extensional period involving the unroofing of dome-shaped metamorphic core complexes, which ultimately led to the radial brittle disruption of these bodies allowing the ascent of andesitic magmas and high-level hydrothermal activity. The deposits are hosted by high-grade metaphorphic rocks belonging to these complexes. Mineralogical and fluid inclusion studies reveal that the mineralizations were formed during two to four hydrothermal stages. These are the result of complex interactions between fluids of contrasted temperatures and salinities. Data on sulphur isotopes suggest that two sources of sulphur existed: magmatic (andesitic derived, with 34S + 6) and metasediment-derived (with initial 34S probably + 25). |
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