A track record of Au-Ag nanomelt generation during fluid-mineral interactions.

Autor: Domínguez-Carretero D; Departament de Mineralogia, Petrologia i Geologia Aplicada, Universitat de Barcelona, Facultat de Ciències de la Terra, Barcelona, Spain. ddominguezcarretero@ub.edu., González-Jiménez JM; Instituto Andaluz de Ciencias de la Tierra (CSIC-UGR), Granada, Spain., Proenza JA; Departament de Mineralogia, Petrologia i Geologia Aplicada, Universitat de Barcelona, Facultat de Ciències de la Terra, Barcelona, Spain.; Institut de Nanociència i Nanotecnologia, IN2UB Facultat de Química, Universitat de Barcelona, Barcelona, Spain., Villanova-de-Benavent C; Departament de Mineralogia, Petrologia i Geologia Aplicada, Universitat de Barcelona, Facultat de Ciències de la Terra, Barcelona, Spain., Llovet X; Centres Científics i Tecnològics, Universitat de Barcelona, Barcelona, Spain., Garcia-Casco A; Instituto Andaluz de Ciencias de la Tierra (CSIC-UGR), Granada, Spain.; Departamento de Mineralogía y Petrología, Facultad de Ciencias, Universidad de Granada, Granada, Spain.
Jazyk: angličtina
Zdroj: Scientific reports [Sci Rep] 2023 May 16; Vol. 13 (1), pp. 7895. Date of Electronic Publication: 2023 May 16.
DOI: 10.1038/s41598-023-35066-y
Abstrakt: Recent studies have reported the significant role of Au-bearing nanoparticles in the formation of hydrothermal gold deposits. Despite the ever-increasing understanding of the genesis and stability of Au-bearing nanoparticles, it is still unknown how they behave when exposed to hydrothermal fluids. Here, we study the nanostructural evolution of Au-Ag nanoparticles hosted within Co-rich diarsenides and sulfarsenides of a natural hydrothermal deposit. We use high-resolution transmission electron microscopy to provide a singular glimpse of the complete melting sequence of Au-Ag nanoparticles exposed to the hydrothermal fluid during coupled dissolution-precipitation reactions of their host minerals. The interaction of Au-Ag nanoparticles with hydrothermal fluids at temperatures (400-500 ºC) common to most hydrothermal gold deposits may promote melting and generation of Au-Ag nanomelts. This process has important implications in noble metal remobilization and accumulation during the formation of these deposits.
(© 2023. The Author(s).)
Databáze: MEDLINE
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