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 deposites (SE Spain)
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AuthorLópez García, José Ángel; Oyarzun Rodríguez, Roberto; Lillo Ramos, Francisco Javier; Manteca Martínez, José Ignacio; Cubas Domínguez, Paloma
Knowledge AreaGeodinámica externa
SponsorsThis study was supported by Grant UCM 910492 (Magmatismo y Mineralizaciones en la Zona Centro-Ibérica Hercínica). We thank Dr. Sol López Andrés for her guidance with mineralogical studies at the UCM Research Support Center (CAI Técnicas Geológicas); and José Luis González Pachón for the photographic work on hand specimens. The paper benefited from the comments of Dr. A. Menzies, an anonymous reviewer, and Associate Editor S. Kojima.
Bibliographic CitationLópez‐García, J. Á., Oyarzun, R., Lillo, J., Manteca, J. I., and Cubas, P. ( 2017) 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). Resource Geology, 67: 139– 157. doi: 10.1111/rge.12124.
KeywordsHigh-K calc-alkaline magmatism
Pb–Zn–Fe ore deposits
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 ...
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