Mantle-to-crust metal transfer by nanomelts
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Título: | Mantle-to-crust metal transfer by nanomelts |
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Autor/es: | Schettino, Erwin | González-Jiménez, José María | Marchesi, Claudio | Palozza, Francesco | Blanco-Quintero, Idael Francisco | Gervilla, Fernando | Braga, Roberto | Garrido, Carlos J. | Fiorentini, Marco |
Grupo/s de investigación o GITE: | Petrología Aplicada |
Centro, Departamento o Servicio: | Universidad de Alicante. Departamento de Ciencias de la Tierra y del Medio Ambiente |
Palabras clave: | Mantle-to-crust | Metal transfer | Nanomelts |
Fecha de publicación: | 14-jul-2023 |
Editor: | Springer Nature |
Cita bibliográfica: | Communications Earth & Environment. 2023, 4:256. https://doi.org/10.1038/s43247-023-00918-y |
Resumen: | The transfer of chalcophile metals across the continental lithosphere has been traditionally modeled based on their chemical equilibrium partitioning in sulfide liquids and silicate magmas. Here, we report a suite of Ni-Fe-Cu sulfide droplets across a trans-lithospheric magmatic network linking the subcontinental lithospheric mantle to the overlying continental crust. Petrographic characteristics and numerical calculations both support that the sulfide droplets were mechanically scavenged from the mantle source during partial melting and transported upwards by alkaline magmas rising through the continental lithosphere. Nanoscale investigation by high-resolution transmission electron microscopy (HR-TEM) documents the presence of galena (PbS) nanoinclusions within the sulfide droplets that are involved in the mantle-to-crust magma route. The galena nanoinclusions show a range of microstructural features that are inconsistent with a derivation of PbS by exsolution from the solid products of the Ni-Fe-Cu sulfide liquid. It is argued that galena nanoinclusions crystallized from a precursor Pb(-Cu)-rich nanomelt, which was originally immiscible within the sulfide liquid even at Pb concentrations largely below those required for attaining galena saturation. We suggest that evidence of immiscibility between metal-rich nanomelts and sulfide liquids during magma transport would disrupt the classical way by which metal flux and ore genesis are interpreted, hinting for mechanical transfer of nanophases as a key mechanism for sourcing the amounts of mantle-derived metals that can be concentrated in the crust. |
Patrocinador/es: | This research was supported by the BES-2017-079949 Ph.D. fellowship to E.S. The Spanish projects PID2019-111715GB-I00/AEI/10.13039/501100011033, NANOMET PID2022-138768OB-I00, and MECOBE ProyExcel_00705 provided funding for field emission gun–environmental scanning electron microscopy (FEG-ESEM), focused-ion beam (FIB) and high-resolution transmission electron microscopy (HR-TEM). M.F. and F.P. acknowledge financial support from the Australian Research Council through ARC Linkage Project LP190100785. |
URI: | http://hdl.handle.net/10045/136453 |
ISSN: | 2662-4435 |
DOI: | 10.1038/s43247-023-00918-y |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/article |
Derechos: | © The Author(s) 2023. Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. |
Revisión científica: | si |
Versión del editor: | https://doi.org/10.1038/s43247-023-00918-y |
Aparece en las colecciones: | INV - PETRA - Artículos de Revistas |
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