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Open AccessArticle

Trace Elements in Magnetite from the Pagoni Rachi Porphyry Prospect, NE Greece: Implications for Ore Genesis and Exploration

1
Faculty of Geology and Geoenvironment, National and Kapodistrian University of Athens, 15784 Athens, Greece
2
Institut für Mineralogie, Westfälische-Wilhelms Universität Münster, 48149 Münster, Germany
3
Department of Applied Geosciences and Geophysics, University of Leoben, 8700 Leoben, Austria
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Department of Geological and Atmospheric Sciences, Iowa State University, Ames, IA 50011-1027, USA
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Faculty of Geology, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
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UMR GeoResources, Faculté des Sciences et Technologies, Université de Lorraine, 54506 Vandoeuvre-lès-Nancy, France
7
GeoZentrum Nordbayern, Universität Erlangen-Nürnberg, D-91054 Erlangen, Germany
*
Author to whom correspondence should be addressed.
Minerals 2019, 9(12), 725; https://doi.org/10.3390/min9120725
Received: 30 October 2019 / Revised: 21 November 2019 / Accepted: 22 November 2019 / Published: 24 November 2019
(This article belongs to the Special Issue Feature Papers in Mineral Geochemistry and Geochronology 2019)
Magnetite is a common accessory phase in various types of ore deposits. Its trace element content has proven to have critical implications regarding petrogenesis and as guides in the exploration for ore deposits in general. In this study we use LA-ICP-MS (laser ablation-inductively coupled plasma-mass spectrometry) analyses of trace elements to chemically characterize magnetite from the Pagoni Rachi Cu–Mo–Re–Au porphyry-style prospect, Thrace, northern Greece. Igneous magnetite mostly occurs as euhedral grains, which are commonly replaced by hematite in fresh to propylitic-altered granodiorite porphyry, whereas, hydrothermal magnetite forms narrow veinlets or is disseminated in sodic/potassic-calcic altered (albite + K-feldspar + actinolite + biotite + chlorite) granodiorite porphyry. Magnetite is commonly associated with chalcopyrite and pyrite and locally exhibits martitization. Laser ablation ICP-MS analyses of hydrothermal magnetite yielded elevated concentrations in several trace elements (e.g., V, Pb, W, Mo, Ta, Zn, Cu, and Nb) whereas Ti, Cr, Ni, and Sn display higher concentration in its magmatic counterpart. A noteworthy enrichment in Mo, Pb, and Zn is an unusual feature of hydrothermal magnetite from Pagoni Rachi. High Si, Al, and Ca values in a few analyses of hydrothermal magnetite imply the presence of submicroscopic or nano-inclusions (e.g., chlorite, and titanite). The trace element patterns of the hydrothermal magnetite and especially the decrease in its Ti content reflect an evolution from the magmatic towards the hydrothermal conditions under decreasing temperatures, which is consistent with findings from analogous porphyry-style deposits elsewhere. View Full-Text
Keywords: magnetite; magmatic; hydrothermal; trace elements; LA-ICP-MS; porphyry; exploration magnetite; magmatic; hydrothermal; trace elements; LA-ICP-MS; porphyry; exploration
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Mavrogonatos, C.; Voudouris, P.; Berndt, J.; Klemme, S.; Zaccarini, F.; Spry, P.G.; Melfos, V.; Tarantola, Α.; Keith, M.; Klemd, R.; Haase, K. Trace Elements in Magnetite from the Pagoni Rachi Porphyry Prospect, NE Greece: Implications for Ore Genesis and Exploration. Minerals 2019, 9, 725.

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