%0 Journal Article
%A Piña García, Rubén
%A Gervilla, Fernando
%A Ortega Menor, Lorena
%A Lunar Hernández, María Del Rosario
%T Mineralogy and geochemistry of platinum groupelements in the Aguablanca Ni-Cudeposit (SW Spain)
%D 2007
%@ 0930-0708
%U https://hdl.handle.net/20.500.14352/49577
%X The Aguablanca Ni-Cu-(PGE) magmatic sulphide deposit is associated with amagmatic breccia located in the northern part of the Aguablanca gabbro (SW,Iberia). Three types of ores are present: semi-massive, disseminated, andchalcopyrite-rich veined ore. The principal ore minerals are pyrrhotite, pentlanditeand chalcopyrite. A relatively abundant platinum-group mineral (PGM) assemblageis present and includes merenskyite, melonite, michenerite, moncheite andsperrylite. Moreover, concentrations of base and precious metals and micro-PIXEanalyses were obtained for the three ore-types. The mineralogy and the mantlenormalisedchalcophile element profiles strongly suggest that semi-massive orerepresents mss crystallisation, whereas the disseminated ore represents an unfractionatedsulphide liquid and the chalcopyrite-rich veined ore a Cu-rich sulphideliquid. Palladium-bearing minerals occur commonly enclosed within sulphides,indicating a magmatic origin rather than hydrothermal. The occurrences and thecomposition of these minerals suggest that Pd was initially dissolved in the sulphidesand subsequently exsolved at low temperatures to form bismutotellurides.Negative Pt and Au anomalies in the mantle-normalised chalcophile element profiles,a lack of Cu-S correlation and textural observations (such as sperrylite losingits euhedral shape when in contact with altered minerals) suggest partial remobilisationof Pt, Au and Cu by postmagmatic hydrothermal fluids after the sulphidecrystallisation.
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