In situ thermochemical sulfate reduction during ore formation at the Itxaspe Zn-(Pb) MVT occurrence (Basque-Cantabrian basin, Northern Spain)

Authors

  • À. PIQUÉ Departament de Cristal·lografia, Mineralogia i Dipòsits Minerals, Facultat de Geologia, Universitat de Barcelonac/ Martí i Franquès s/n, 08028 Barcelona, Spain
  • À. CANALS I SABATÉ Departament de Cristal·lografia, Mineralogia i Dipòsits Minerals, Facultat de Geologia, Universitat de Barcelonac/ Martí i Franquès s/n, 08028 Barcelona, Spain
  • J.R. DISNAR Institut des Sciences de la Terre d’Orléans, UMR 6113, CNRS-INSU, Université d’Orléans1A Rue de la Férollerie, 45071 Orléans Cédex 2, France
  • F. GRANDIA I BORRÀS Amphos 21Pg. de Rubí 29-31, 08197 Valldoreix, Spain

DOI:

https://doi.org/10.1344/105.000001448

Keywords:

Bitumen, Thermochemical sulfate reduction, Mississippi Valley-type deposits, Basque-Cantabrian basin

Abstract

Organic matter is thought to play a role in the genesis of many Mississippi Valley-type (MVT) deposits, actino as a reducing agent during thermochemical sulfate reduction (TSR). Although TSR is an extremely slow reaction t low temperatures (lt;100ºC), under favorable conditions it may supply the necessary reduced sulfur during ore formation. To test this hypothesis, the Itxaspe Zn-(Pb) MVT occurrence in the Basque-Cantabrian basin (Northern Spain) was studied. Sphalerite, the main ore phase, is generally found disseminated in Urgonian (Lower Cretaceous) carbonates, and in close relationship with solid bitumen. The bitumen source rock was very likely deposited in a marine marginal setting. Differences in composition of the bitumen samples are attributed to a fractionation during hydrocarbon expulsion and/or migration. The fluids involved in ore deposition were low temperature (Th ~130ºC), Na-Ca-Cl-(K-Mg)-type brines (salinities ~12.5 equiv. mass % NaCl). The origin of brine solutes (including sulfate) is related to the dissolution of Mesozoic evaporite units, although the contribution of evaporated seawater brines cannot be ruled out. The temperatures of ore deposition, the close relationship between the bitumen and ore phases, the presence of aromatic sulfur-bearing compounds and the δ34S of sulfides and sulfates are consistent with an in situ TSR during ore formation in the Itxaspe Zn-(Pb) occurrence. Therefore, at least for small mineralizations like Itxaspe, our conclusion is that the necessary reduced sulfur can be supplied by TSR during ore genesis at the site of metal deposition.

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