Geochemical Characterization of Magnetite and Geological Setting of the Iron Oxide ± Iron Silicate ± Iron Carbonate Rich Pb–Zn Sulfides from the La Unión and Mazarrón Stratabound Deposits (SE Spain)
From a mineralogical point of view the La Unión ore field (SE Spain) can be regarded as an oddity as some of its hydrothermal, stratabound type deposits display an extremely unusual paragenesis comprising magnetite ± greenalite ± minnesotaite ± siderite and galena ± sphalerite (IOSC – LZS). Recent m...
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ftunivcmadrid:oai:www.ucm.es:47501 2023-05-15T17:04:21+02:00 Geochemical Characterization of Magnetite and Geological Setting of the Iron Oxide ± Iron Silicate ± Iron Carbonate Rich Pb–Zn Sulfides from the La Unión and Mazarrón Stratabound Deposits (SE Spain) López García, José Ángel Oyarzun, Roberto Lillo Ramos, F. Javier Cubas, Paloma 2017 application/pdf https://eprints.ucm.es/id/eprint/47501/ https://eprints.ucm.es/id/eprint/47501/1/Geochemi%20cal%20Characte%20rization%20of%20Magnetite.pdf https://onlinelibrary.wiley.com/toc/17513928/67/2 https://doi.org/10.1111/rge.12124 en eng Wiley https://eprints.ucm.es/id/eprint/47501/1/Geochemi%20cal%20Characte%20rization%20of%20Magnetite.pdf info:eu-repo/semantics/restrictedAccess Cristalografía info:eu-repo/semantics/article PeerReviewed 2017 ftunivcmadrid https://doi.org/10.1111/rge.12124 2022-05-12T20:06:15Z From a mineralogical point of view the La Unión ore field (SE Spain) can be regarded as an oddity as some of its hydrothermal, stratabound type deposits display an extremely unusual paragenesis comprising magnetite ± greenalite ± minnesotaite ± siderite and galena ± sphalerite (IOSC – LZS). Recent mineralogical studies have shown that this paragenesis is also present at the neighboring Mazarrón ore field. These ore fields share a similar geologic setting, involving metamorphic and sedimentary rocks (Paleozoic s.l. to Permian) hosting late Miocene high‐K calc‐alkaline volcanic and subvolcanic rocks. The latter have andesitic to dacitic composition, and triggered hydrothermal activity and ore deposition. This study discusses the detailed mineral chemistry of magnetite samples from Mazarrón and La Unión and provides some hints for the origin of the IOSC – LZS paragenesis. We performed electron microprobe (EPMA) analyses in magnetite samples from La Unión and Mazarrón to determine the contents of minor and trace elements (Zn, Ni, Mn, Cr, V, K, Ca, Ti, Al, Si, Mg). Given that some results fell below the detection limit for the EPMA instrumental conditions we used robust regression on order statistics (robust ROS), with the NADA package in R to deal with these data sets. The Ca + Al + Mn contents in magnetites from San Cristóbal and Emilia are equivalent to the mean contents of those of IOCG, Kiruna, BIF, Cu porphyry, skarn, VMS, hydrothermal and clastic Pb–Zn deposits, but they are low in Ti + V and Ni + Cr. The principal components analysis indicates that Zn, Ni, Cr, V, K, Ca, Ti, and Mg are roughly collinear, therefore correlated, being also independent from Fe. Besides, the function discriminant analysis of data shows that the magnetites from Emilia and San Cristóbal cluster in differentiated groups, thus probably reflecting some differences related to the distance to the magmatic source that triggered the hydrothermal system: proximal in the case of San Cristóbal and distal in Emilia. Article in Journal/Newspaper Kiruna Universidad Complutense de Madrid (UCM): E-Prints Complutense Kiruna Resource Geology 67 2 139 157 |
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Universidad Complutense de Madrid (UCM): E-Prints Complutense |
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ftunivcmadrid |
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English |
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Cristalografía |
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Cristalografía López García, José Ángel Oyarzun, Roberto Lillo Ramos, F. Javier Cubas, Paloma Geochemical Characterization of Magnetite and Geological Setting of the Iron Oxide ± Iron Silicate ± Iron Carbonate Rich Pb–Zn Sulfides from the La Unión and Mazarrón Stratabound Deposits (SE Spain) |
topic_facet |
Cristalografía |
description |
From a mineralogical point of view the La Unión ore field (SE Spain) can be regarded as an oddity as some of its hydrothermal, stratabound type deposits display an extremely unusual paragenesis comprising magnetite ± greenalite ± minnesotaite ± siderite and galena ± sphalerite (IOSC – LZS). Recent mineralogical studies have shown that this paragenesis is also present at the neighboring Mazarrón ore field. These ore fields share a similar geologic setting, involving metamorphic and sedimentary rocks (Paleozoic s.l. to Permian) hosting late Miocene high‐K calc‐alkaline volcanic and subvolcanic rocks. The latter have andesitic to dacitic composition, and triggered hydrothermal activity and ore deposition. This study discusses the detailed mineral chemistry of magnetite samples from Mazarrón and La Unión and provides some hints for the origin of the IOSC – LZS paragenesis. We performed electron microprobe (EPMA) analyses in magnetite samples from La Unión and Mazarrón to determine the contents of minor and trace elements (Zn, Ni, Mn, Cr, V, K, Ca, Ti, Al, Si, Mg). Given that some results fell below the detection limit for the EPMA instrumental conditions we used robust regression on order statistics (robust ROS), with the NADA package in R to deal with these data sets. The Ca + Al + Mn contents in magnetites from San Cristóbal and Emilia are equivalent to the mean contents of those of IOCG, Kiruna, BIF, Cu porphyry, skarn, VMS, hydrothermal and clastic Pb–Zn deposits, but they are low in Ti + V and Ni + Cr. The principal components analysis indicates that Zn, Ni, Cr, V, K, Ca, Ti, and Mg are roughly collinear, therefore correlated, being also independent from Fe. Besides, the function discriminant analysis of data shows that the magnetites from Emilia and San Cristóbal cluster in differentiated groups, thus probably reflecting some differences related to the distance to the magmatic source that triggered the hydrothermal system: proximal in the case of San Cristóbal and distal in Emilia. |
format |
Article in Journal/Newspaper |
author |
López García, José Ángel Oyarzun, Roberto Lillo Ramos, F. Javier Cubas, Paloma |
author_facet |
López García, José Ángel Oyarzun, Roberto Lillo Ramos, F. Javier Cubas, Paloma |
author_sort |
López García, José Ángel |
title |
Geochemical Characterization of Magnetite and Geological Setting of the Iron Oxide ± Iron Silicate ± Iron Carbonate Rich Pb–Zn Sulfides from the La Unión and Mazarrón Stratabound Deposits (SE Spain) |
title_short |
Geochemical Characterization of Magnetite and Geological Setting of the Iron Oxide ± Iron Silicate ± Iron Carbonate Rich Pb–Zn Sulfides from the La Unión and Mazarrón Stratabound Deposits (SE Spain) |
title_full |
Geochemical Characterization of Magnetite and Geological Setting of the Iron Oxide ± Iron Silicate ± Iron Carbonate Rich Pb–Zn Sulfides from the La Unión and Mazarrón Stratabound Deposits (SE Spain) |
title_fullStr |
Geochemical Characterization of Magnetite and Geological Setting of the Iron Oxide ± Iron Silicate ± Iron Carbonate Rich Pb–Zn Sulfides from the La Unión and Mazarrón Stratabound Deposits (SE Spain) |
title_full_unstemmed |
Geochemical Characterization of Magnetite and Geological Setting of the Iron Oxide ± Iron Silicate ± Iron Carbonate Rich Pb–Zn Sulfides from the La Unión and Mazarrón Stratabound Deposits (SE Spain) |
title_sort |
geochemical characterization of magnetite and geological setting of the iron oxide ± iron silicate ± iron carbonate rich pb–zn sulfides from the la unión and mazarrón stratabound deposits (se spain) |
publisher |
Wiley |
publishDate |
2017 |
url |
https://eprints.ucm.es/id/eprint/47501/ https://eprints.ucm.es/id/eprint/47501/1/Geochemi%20cal%20Characte%20rization%20of%20Magnetite.pdf https://onlinelibrary.wiley.com/toc/17513928/67/2 https://doi.org/10.1111/rge.12124 |
geographic |
Kiruna |
geographic_facet |
Kiruna |
genre |
Kiruna |
genre_facet |
Kiruna |
op_relation |
https://eprints.ucm.es/id/eprint/47501/1/Geochemi%20cal%20Characte%20rization%20of%20Magnetite.pdf |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1111/rge.12124 |
container_title |
Resource Geology |
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67 |
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2 |
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139 |
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157 |
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1766058424843370496 |