Stable isotope geochemistry of the Ulldemolins Pb-Zn-Cu deposit (SW Catalonian Coastal Ranges, Spain)
Alfonso, Pura (Universitat Politècnica de Catalunya. Departament d'Enginyeria Minera i Recursos Naturals)
Canet, C. (Universidad Nacional Autónoma de México. Instituto de Geofísica)
Melgarejo Draper, Joan Carles (Universitat de Barcelona. Departament de Cristal·lografia, Mineralogia i Dipòsits Minerals)
Mata i Perelló, Josep M. (Josep Maria) (Universitat Politècnica de Catalunya. Departament d'Enginyeria Minera i Recursos Naturals)
Fallick, A. E. (Scottish Universities Environmental Research Centre. Isotope Geosciences Unit)

Date:	2012
Abstract:	The Pb-Zn-Cu deposit of Ulldemolins occurs within the Carboniferous sedimentary series of the southernmost Catalonian Coastal Ranges. It consists of sulphide-bearing calc-silicate assemblages, with epidote, Ca-amphiboles and Ca-garnet, which develop selectively along a dolomicrite bed near the contact with a granite porphyry. Two mineralisation styles can be differentiated: a) banded and b) irregular. Fluid inclusions and stable isotope compositions of sulphur in sulphides (sphalerite, galena and chalcopyrite) and carbon and oxygen in carbonates (calcite and dolomite) were studied in order to constrain the genesis and the source of mineralizing fluids. Fluid inclusions in sphalerite and calcite are aqueous, liquid+vapour and have a salinity between 1. 2 and 7. 2 wt% NaCl eq. and homogenization temperatures in the range of 273º to 368ºC. The 34S(V-CDT) values in the banded mineralisation are mostly between -1. 5 and +2. 1‰, and those from the irregular mineralisation are between -1. 1 and +20. 5‰. These 34S values of the banded mineralisation are in agreement with a magmatic origin of sulphur. In addition, the 18O(SMOW) values of hydrothermal calcite, from +6. 9 to +12. 5‰, are consistent with a magmatic origin of the fluids that formed the banded ore deposit. Later, a new input of fluids interacted with the previously formed mineral assemblages and modified part of the deposit, leading locally to an irregular skarn mineralisation.
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan aquestes es distribueixin sota la mateixa llicència que regula l'obra original i es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Ore deposits ; Skarn ; Calcsilicates ; Stable isotopes ; Fluid inclusions
Published in:	Geologica acta, Vol. 10, Núm. 2 (June 2012) , p. 145-157, ISSN 1696-5728

Adreça alternativa: https://raco.cat/index.php/GeologicaActa/article/view/257170
Adreça alternativa: https://revistes.ub.edu/index.php/GEOACTA/article/view/105.000001707.
DOI: 10.1344/105.000001707

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