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Significance of phyllosilicate mineralogy and mineral chemistry in an epithermal environment; insights from the Palai-Islica Au-Cu deposit (Almería, SE Spain)

Carrillo-Rosúa, Javier ; Morales-Ruano, Salvador ; Esteban-Arispe, Iñaki ; Fenoll-Hach Alí, Purificación

Clays and clay minerals, 2009-02, Vol.57 (1), p.1-24 [Periódico revisado por pares]

Cham: Clay Minerals Society

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Título:
Significance of phyllosilicate mineralogy and mineral chemistry in an epithermal environment; insights from the Palai-Islica Au-Cu deposit (Almería, SE Spain)
Autor: Carrillo-Rosúa, Javier ; Morales-Ruano, Salvador ; Esteban-Arispe, Iñaki ; Fenoll-Hach Alí, Purificación
Assuntos: Almeria Spain ; Andalusia Spain ; Biogeosciences ; chemical composition ; chemical ratios ; Chlorite ; chlorite group ; clay mineralogy ; clay minerals ; copper ores ; Earth and Environmental Science ; Earth Sciences ; Earth, ocean, space ; Economic geology ; Epithermal ; epithermal processes ; Europe ; Exact sciences and technology ; Geochemistry ; Gold ; gold ores ; host rocks ; hydrothermal alteration ; Iberian Peninsula ; igneous rocks ; illite ; Intermediate-Sulfidation ; kaolinite ; magmatism ; Medicinal Chemistry ; metal ores ; metallogeny ; metasomatism ; Mica ; mineral deposits, genesis ; Mineralogy ; Nanoscale Science and Technology ; Palai-Islica Deposit ; pyrophyllite ; rock, sediment, soil ; sed rocks, sediments ; Sedimentary petrology ; sheet silicates ; Silicates ; smectite ; Soil Science & Conservation ; southeastern Spain ; Southern Europe ; Spain ; volcanic rocks ; Volcanic-Hosted
É parte de: Clays and clay minerals, 2009-02, Vol.57 (1), p.1-24
Notas: 0009-8604(20090201)57:1L.1;1-
(QE) Geology
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Descrição: Phyllosilicate mineralogy is key to understanding hydrothermal processes within accepted epithermal deposit models but little information has been published about the mineral chemistry of epithermal deposits. X-ray diffraction, optical and electronic microscopy (scanning and transmitted), electron microprobe, and Fourier transform infrared spectroscopy were used in this work 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. Different phyllosilicate assemblages are characteristic of 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) among 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, of the intermediate argillic and advanced argillic alteration around areas of silicification. In the latter, native gold appears associated with 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.
Editor: Cham: Clay Minerals Society
Idioma: Inglês

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Significance of phyllosilicate mineralogy and mineral chemistry in an epithermal environment; insights from the Palai-Islica Au-Cu deposit (Almería, SE Spain)

Carrillo-Rosúa, Javier ; Morales-Ruano, Salvador ; Esteban-Arispe, Iñaki ; Fenoll-Hach Alí, Purificación

Cham: Clay Minerals Society

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