Jarosita y minerales afines en el depósito epitermal de Palai-Islica (Carboneras, Almería). Geoquímica e implicaciones genéticas
Identificadores
URI: http://hdl.handle.net/10481/35394Metadata
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Morales Ruano, Salvador; Carrillo Rosúa, Francisco Javier; Boyce, Adrian J.; Fallick, Anthony E.Editorial
Sociedad Geológica de España
Materia
Jarosita Jarosite Sulfatos Sulfates Química mineral Mineral chemistry Epitermal Epithermal Sureste de España Gold Oro Stable isotopes Isotopos estables
Date
2004Referencia bibliográfica
Morales Ruano S.; Carrillo Rosúa F.J.; Boyce A.J.; Fallick A.E. Jarosita y minerales afines en el depósito epitermal de Palai-Islica (Carboneras, Almería). Geoquímica e implicaciones genéticas. Geo-Temas, 6: 225-228 (2004). [http://hdl.handle.net/10481/35394]
Sponsorship
Departamento de Mineralogía y Petrología (Universidad de Granada); Trabajo financiado por BTE 2001-3308 y 2003-06265 (DGCYT) y RNM131 (Junta de Andalucía).Abstract
En el presente trabajo se describen las características texturales, químicas e isotópicas de la jarosita y de distintos sulfatos relacionados del depósito epitermal de Au-Cu de Palai-Islica (Almería) y se discute su significado e implicaciones genéticas. Barite and great quantities of Fe±Al sulfates (jarosite, natrojarosite, natroalunite and aluminite) together gypsum characterize the latest stages of the Au-Cu, Tertiary volcanic related, epithermal mineralisation of Palai-Islica. The Fe±Al sulfates present at the top of the mineralisation have a complex chemistry: an almost complete Na+-K+, an incomplete Fe3+-Al3+ solid solutions and uncommon substitution vector (PAsPbS-2(NaK)-1). The textural relations show an AlFe, accompanied for a pH decrease, and a more hypothetical KNa trends. The S and O isotope study is in accordance with a evolution from warm marine waters (± magmatic input) which precipitate barite after the ore episode to meteoric relatively cool waters. The product of these last waters are gypsum and the Fe±Al sulfates. As show the isotope results, the source of S for this sulfates is the oxidation of sulfides. In addition, a H2S input from hydrothermal fluids has also been deduced to exist since the great abundance of the sulphates, the scarcity of sulfide oxidation features and the presence of fluid inclusions in gypsum that not homogenize until gypsum dehydration.