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Please use this identifier to cite or link to this item: http://hdl.handle.net/10481/7031

Title: Significance of phyllosilicate mineralogy and mineral chemistry in the epithermal environment. Insights from the Palai-Islica Au-Cu deposit (Almería, SE Spain)
Authors: Carrillo-Rosúa, Javier
Morales-Ruano, Salvador
Esteban-Arispe, Iñaki
Fenoll Hach-Alí, Purificación
Issue Date: Jan-2009
Abstract: X-ray diffraction, optical and electronic microscopy (scanning and transmitted), electron microprobe and Fourier transform infra red spectroscopy has been used to study phyllosilicates in the Palai-Islica Au-Cu epithermal, volcanic-hosted deposit, in order to link phyllosilicate mineralogy and mineral chemistry to ore genesis. Thus, different phyllosilicate assemblages characterize two types of mineralization, and related hydrothermal alteration. Chlorite and mica appear in polymetallic quartz veins with sulfides, and in the related chloritic and sericitic hydrothermal alteration. These minerals have notable textural and chemical differences (i.e. Fe/(Fe+Mg), Si and Al in chlorite and illitic and phengitic components in mica) amongst veins and altered rocks, revealing different genetic conditions. These chemical features also distinguish propylitic and regional, non ore-related, low-temperature alteration. Hot hydrothermal fluids of near-neutral pH are responsible for vein mineralization and alteration. Illite, interstratified illite-smectite, kaolinite and pyrophyllite are characteristic, with a distribution pattern by zones, for the intermediate argillic and advanced argillic alteration around areas of silicification. In the latter, native gold appears associated to interstratified illite-smectite, suggesting a relatively low temperature formation. Hot, low-pH fluids are responsible for this mineralization and alteration assemblage. The present study contributes to epithermal models showing the co-existence of two different alteration styles in the same hydrothermal system.
Sponsorship: Departamento de Mineralogía y Petrología. Departamento de Didáctica de las Ciencias Experimentales. Grupo de Investigación de la Junta de Andalucía RNM-0131. Proyecto CGL-2006-02594/BTE. Proyecto Junta de Andalucía RNM-732.
Publisher: Clay Minerals Society
Keywords: Chlorite
Clorita
Epithermal
Epitermal
Gold
Oro
Mica
Spain
España
Intermediate-sulfidation
Volcanic-hosted
URI: http://hdl.handle.net/10481/7031
ISSN: 0009-8604
Rights : Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License
Citation: Carrillo-Rosúa, J., Morales-Ruano, S., Esteban-Arispe, I., & Hach-Alí, P. F. (2009). Significance of phyllosilicate mineralogy and mineral chemistry in an epithermal environment. insights from the palai-islica au-cu deposit (almería, SE spain). Clays and Clay Minerals, 57(1), 1-24. doi:10.1346/CCMN.2009.0570101
Appears in Collections:DDCE - Artículos

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