Iron sulphides at the epithermal gold-copper deposit of Palai-Islica (Almería, SE of Spain)
Metadatos
Mostrar el registro completo del ítemEditorial
Mineralogical Society
Materia
Pyrite Pirita Gold Oro Epithermal Epitermal Spain España
Fecha
2003Referencia bibliográfica
Carrillo Rosúa, F. J., Morales Ruano, S., & Hach-Alí, P. F. (2003). Iron sulphides at the epithermal gold-copper deposit of palai-islica (almería, SE spain). Mineralogical Magazine, 67(5), 1059-1080. doi:10.1180/0026461036750143
Patrocinador
Departamento de Mineralogía y Petrología. Grupo de Investigación de la Junta de Andalucía RNM-0131. Proyectos PB-97-1211 y BTE2001-3308Resumen
Au-Cu mineralisation at Palai-Islica occurs as disseminations in massive silicification and, more abundantly, in sulphide-bearing quartz veins. The major ore minerals in the deposit are pyrite ± chalcopyrite, sphalerite and galena and there are a great variety of accessory minerals, including Au-Ag alloys and native gold. Pyrite, the most abundant sulphide, is closely associated with gold. Seven different types of pyrite have been distinguished with a variable concentration of different trace elements. Among them only free of trace elements (type IV) is related to Au-Ag alloys. Pyrites associated with these Au-Ag alloys have a cubic and pentagonal dodecahedral habits whereas those with only the pentagonal dodecahedral habit are from barren zones. In addition, there is no significant invisible gold in pyrite, but there is relatively high Ag in collomorphic pyrite (up to 0.20 wt%) or type III pyrite (up to 1.47 wt%). As is the most abundant trace element in pyrite (up to 6.11 wt%), present as a metastable solid solution or as a non-stoichiometric element. Some kind of marcasite related with gold levels also have considerable amounts of trace elements (As, up to 1.15 wt%, Sb up to 0.40 wt%)