Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/175973
Title: Mineralogy of the HSE in the subcontinental lithospheric mantle - An interpretative review
Author: González Jiménez, José María
Tassara, S
Schettino, E.
Roqué, Josep
Farré De Pablo, Júlia
Saunders, J.E.
Deditius, A.P.
Colás, V.
Rovira-Medina, J.J.
Guadalupe Dávalos, M.
Schilling, M.
Jiménez Franco, María Abigail
Marchesi, C.
Nieto, Fernando
Proenza Fernández, Joaquín Antonio
Gervilla Linares, Fernando
Keywords: Mineralogia
Sulfurs
Nanopartícules
Mineralogy
Sulfides
Nanoparticles
Issue Date: Jul-2020
Publisher: Elsevier B.V.
Abstract: The highly siderophile elements (HSE: Os, Ir, Ru, Rh, Pt, Pd, Re, Au) exist in solid solution in accessory base-metal sulfides (BMS) as well as nano-to-micron scale minerals in rocks of the subcontinental lithospheric mantle (SCLM). The latter include platinum-group minerals (PGM) and gold minerals, which may vary widely in morphology, composition and distribution. The PGM form isolated grains often associated with larger BMS hosted in residual olivine, located at interstices in between peridotite-forming minerals or more commonly in association with metasomatic minerals (pyroxenes, carbonates, phosphates) and silicate glasses in some peridotite xenoliths. The PGM found inside residual olivine are mainly Os-, Ir- and Ru-rich sulfides and alloys. In contrast, those associated with metasomatic minerals or silicate glasses of peridotite xenoliths consist of Pt, Pd, and Rh bonded with semimetals like As, Te, Bi, and Sn. Nanoscale observations on natural samples along with the results of recent experiments indicate that nucleation of PGM is mainly related with the uptake of HSE by nanoparticles, nanominerals or nanomelts at high temperature (> 900 °C) in both silicate and/or sulfide melts, regardless of the residual or metasomatic origin of their host minerals. A similar interpretation can be assumed for gold minerals, whose formation is exclusively related to metasomatic BMS. Our observations highlight that nanoscale processes play an important role on the ore-forming potential of primitive mantle-derived magmas parental to magmatic-hydrothermal deposits enriched in noble metals. The metal inventory in these magmas could be related with the physical incorporation of HSE-nanoparticles (HSE-NPs) during processes of partial melting of mantle peridotite and melt migration from the mantle to overlying continental crust.
Note: Versió postprint del document publicat a: https://doi.org/10.1016/j.lithos.2020.105681
It is part of: Lithos, 2020, vol. 372-373, num. 105681
URI: http://hdl.handle.net/2445/175973
Related resource: https://doi.org/10.1016/j.lithos.2020.105681
ISSN: 0024-4937
Appears in Collections:Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada)

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