Nanomaterial accumulation in boiling brines enhances epithermal bonanzas.

Autor: Cano N; Programa de Posgrado en Ciencias de la Tierra, Universidad Nacional Autónoma de México (UNAM). Ciudad Universitaria, 04510, Coyoacán, CDMX, Mexico. nacanoh@comunidad.unam.mx., González-Jiménez JM; Instituto Andaluz de Ciencias de la Tierra, CSIC-Universidad de Granada, Avda. de Las Palmeras 4, 18100, Armilla, Granada, Spain., Camprubí A; Instituto de Geología, UNAM. Ciudad Universitaria, 04510, Coyoacán, CDMX, Mexico., Domínguez-Carretero D; Departament de Mineralogia, Petrologia i Geologia Aplicada, Facultat de Ciències de la Terra, Universitat de Barcelona, Martí I Franquès S/N, 08028, Barcelona, Spain., González-Partida E; Centro de Geociencias, UNAM, Blvd. Juriquilla 3001, 76230, Juriquilla, Qro., Mexico., Proenza JA; Departament de Mineralogia, Petrologia i Geologia Aplicada, Facultat de Ciències de la Terra, Universitat de Barcelona, Martí I Franquès S/N, 08028, Barcelona, Spain.
Jazyk: angličtina
Zdroj: Scientific reports [Sci Rep] 2023 Sep 11; Vol. 13 (1), pp. 14985. Date of Electronic Publication: 2023 Sep 11.
DOI: 10.1038/s41598-023-41756-4
Abstrakt: Epithermal bonanza-type ores, characterized by weight-percent contents of e.g., gold and silver in a few mm to cm, are generated by mixtures of magmatic-derived hydrothermal brines and external fluids (e.g., meteoric) that transport a variety of metals to the site of deposition. However, the low solubilities of precious metals in hydrothermal fluids cannot justify the high concentrations necessary to produce such type of hyper-enriched metal ore. Here we show that boiling metal-bearing brines can produce, aggregate, and accumulate metal nanomaterials, ultimately leading to focused gold + silver ± copper over-enrichments. We found direct nano-scale evidence of nanoparticulate gold- and/or silver-bearing ores formed via nonclassical growth (i.e., nanomaterial attachment) during boiling in an intermediate-sulfidation epithermal bonanza. The documented processes may explain the generation of bonanzas in metal-rich brines from a range of mineral deposit types.
(© 2023. Springer Nature Limited.)
Databáze: MEDLINE
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