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Hydrothermal palladium enrichment in podiform chromitites of Calzadilla de los Barros (SW Iberian Peninsula)



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Merinero Palomares, Raúl and Lunar Hernández, Rosario and Ortega Menor, Lorena and Piña García, Rubén and Monterrubio Pérez, Serafín and Gervilla, Fernando (2013) Hydrothermal palladium enrichment in podiform chromitites of Calzadilla de los Barros (SW Iberian Peninsula). The Canadian mineralogist, 51 (3). pp. 387-404. ISSN 0008-4476

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Official URL: https://doi.org/10.3749/canmin.51.3.387


The serpentinized peridotite massifs of Calzadilla de los Barros (Ossa-Morena zone, Iberian massif) consist of harzburgites and small dunite bodies containing Al-rich chromitite pods. Minor discordant clinopyroxenite veins cut the peridotite massifs. The chromitites show total transformation of the silicate matrix into chlorite and post-magmatic formation of chalcopyrite, millerite, magnetite, and chalcedony. Olivine in harzburgites and dunites is mainly transformed into pargasite. The clinopyroxenites show diopside transformation into epidote, grossular, and titanite and locally into hydrous minerals (chlorite, pargasite, and tremolite) associated with the formation of Cu-Fe-Ni sulfides, suggesting significant hydrothermal alteration. The chondrite-normalized platinum-group elements patterns of the chromitites are very similar to those of the harzburgites and clinopyroxenites, showing an unusual sharply positive slope from Pt to Pd, as well as high Pd/Ir ratios. In the chromitites, the Pd/Ir ratio shows both positive and negative linear correlations with bulk platinum-group element contents. These results suggest that most of the Os, Ir, and Ru were incorporated during the magmatic phase, while Pd and Pt were incorporated during post-magmatic processes of hydrothermal alteration and formation of Cu-Fe-Ni sulfides. This study provides a better understanding of the post-magmatic processes that allow Pd enrichment in ophiolite complexes, and highlights how platinum-group element patterns can provide significant insights into both magmatic and post-magmatic processes.

Item Type:Article
Uncontrolled Keywords:Podiform chromitite; Platinum-group elements; Positive-sloped chondrite-normalized PGE pattern; Calzadilla de los Barros, Ossa-Morena; Iberian massif.
Subjects:Sciences > Geology > Mineralogy
ID Code:70513
Deposited On:17 Feb 2022 09:21
Last Modified:17 Feb 2022 09:21

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