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Title: Critical Elements in Supergene Phosphates: The Example of the Weathering Profile at the Gavà Neolithic Mines, Catalonia, Spain
Author: Díaz-Acha, Y.
Campeny, Marc
Tauler i Ferré, Esperança
Bosch, Josep
Melgarejo i Draper, Joan-Carles
Camprubí, A.
Villanova de Benavent, Cristina
Jorge-Villar, S.E.
Díaz-Ontiveros, I.
Fernández-Lluch, D.
Proenza Fernández, Joaquín Antonio
Andreazini, A.
Pastor, Míriam
Keywords: Fosfats
Mines and mineral resources
Neolithic period
Issue Date: 18-Dec-2019
Publisher: MDPI
Abstract: The essential role of Critical Elements (CE) in 21st century economy has led to an increasing demand of these metals and promotes the exploration of non-conventional deposits such as weathering profiles. The present work is focused on the study of a weathering profile located at the Archaeological Park of the Gavà Neolithic Mines, Barcelona, Catalonia, Spain. In the Gavà deposit, acid and oxidising meteoric fluids generated intense weathering during the early Pleistocene, affecting series of Llandoverian black shales and associated syn-sedimentary phosphates. The circulation of these acid fluids at deeper levels of the profile generated supergene vein-like mineralisations comprised of secondary phosphates (e.g., variscite, perhamite, crandallite, phosphosiderite) and sulphates (e.g., jarosite, alunite). This supergene mineralisation is significantly enriched in certain CE (e.g., Ga, Sc, REE, In, Co and Sb) that were mobilised from host rock components and later hosted in the crystal lattice of supergene minerals. Weathering processes and corresponding supergene enrichment of CE at the Gavà deposit could be used as an example to determine exploration guidelines of CE in weathering profiles and associated supergene phosphates worldwide.
Note: Reproducció del document publicat a:
It is part of: Minerals, 2019, vol. 10, num. 1, p. 3
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ISSN: 2075-163X
Appears in Collections:Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada)

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