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10.3390/min10020182
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Article

Mineralogical Constraints on the Potassic and Sodic-Calcic Hydrothermal Alteration and Vein-Type Mineralization of the Maronia Porphyry Cu-Mo ± Re ± Au Deposit in NE Greece

by
Vasilios Melfos
1,*,
Panagiotis Voudouris
2,
Margarita Melfou
1,
Matías G. Sánchez
3,
Lambrini Papadopoulou
1,
Anestis Filippidis
1,
Paul G. Spry
4,
Anna Schaarschmidt
5,
Reiner Klemd
5,
Karsten M. Haase
5,
Alexandre Tarantola
6 and
Constantinos Mavrogonatos
2
1
Department of Mineralogy, Petrology and Economic Geology, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
2
Department of Mineralogy-Petrology, National and Kapodistrian University of Athens, 15784 Athens, Greece
3
Fault Rocks Inc., Vancouver, BC V6G 1M8, Canada
4
Department of Geological and Atmospheric Sciences, Iowa State University, Ames, IA 50011, USA
5
GeoZentrum Nordbayern, Friedrich-Alexander-Universität (FAU) Erlangen-Nürnberg, Schlossgarten 5, 91054 Erlangen, Germany
6
GeoRessources, Faculté des Sciences et Technologies, UMR Université de Lorraine, 54506 Nancy, France
*
Author to whom correspondence should be addressed.
Minerals 2020, 10(2), 182; https://doi.org/10.3390/min10020182
Submission received: 18 January 2020 / Revised: 7 February 2020 / Accepted: 16 February 2020 / Published: 18 February 2020
(This article belongs to the Section Mineral Deposits)
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Abstract

The Maronia Cu-Mo ± Re ± Au deposit is spatially related to a microgranite porphyry that intruded an Oligocene monzonite along the Mesozoic Circum-Rhodope belt in Thrace, NE Greece. The magmatic rocks and associated metallic mineralization show plastic and cataclastic features at the south-eastern margin of the deposit that implies emplacement at the ductile-brittle transition, adjacent to a shear zone at the footwall of the Maronia detachment fault. The conversion from ductile to brittle deformation caused a rapid upward magmatic fluid flow and increased the volume of water that interacted with the host rocks through high permeable zones, which produced extensive zones of potassic and sodic-calcic alteration. Potassic alteration is characterized by secondary biotite + K-feldspar (orthoclase) + magnetite + rutile + quartz ± apatite and commonly contains sulfides (pyrite, chalcopyrite, pyrrhotite). Sodic-calcic alteration consists of actinolite + sodic-calcic plagioclase (albite/oligoclase/andesine) + titanite + magnetite + chlorite + quartz ± calcite ± epidote-allanite. The high-oxidation state of the magmas and the hydrothermal fluid circulation were responsible for the metal and sulfur enrichments of the aqueous fluid phase, an increase in O2 gas content, the breakdown of the magmatic silicates and the production of the extensive potassic and sodic-calcic alterations. Brittle deformation also promoted the rapid upward fluid flow and caused interactions with the surrounding host rocks along the high temperature M-, EB-, A- and B-type veins.
Keywords: porphyry deposit; potassic alteration; sodic-calcic alteration; vein-types; Maronia; Greece porphyry deposit; potassic alteration; sodic-calcic alteration; vein-types; Maronia; Greece
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MDPI and ACS Style

Melfos, V.; Voudouris, P.; Melfou, M.; Sánchez, M.G.; Papadopoulou, L.; Filippidis, A.; Spry, P.G.; Schaarschmidt, A.; Klemd, R.; Haase, K.M.; et al. Mineralogical Constraints on the Potassic and Sodic-Calcic Hydrothermal Alteration and Vein-Type Mineralization of the Maronia Porphyry Cu-Mo ± Re ± Au Deposit in NE Greece. Minerals 2020, 10, 182. https://doi.org/10.3390/min10020182

AMA Style

Melfos V, Voudouris P, Melfou M, Sánchez MG, Papadopoulou L, Filippidis A, Spry PG, Schaarschmidt A, Klemd R, Haase KM, et al. Mineralogical Constraints on the Potassic and Sodic-Calcic Hydrothermal Alteration and Vein-Type Mineralization of the Maronia Porphyry Cu-Mo ± Re ± Au Deposit in NE Greece. Minerals. 2020; 10(2):182. https://doi.org/10.3390/min10020182

Chicago/Turabian Style

Melfos, Vasilios, Panagiotis Voudouris, Margarita Melfou, Matías G. Sánchez, Lambrini Papadopoulou, Anestis Filippidis, Paul G. Spry, Anna Schaarschmidt, Reiner Klemd, Karsten M. Haase, and et al. 2020. "Mineralogical Constraints on the Potassic and Sodic-Calcic Hydrothermal Alteration and Vein-Type Mineralization of the Maronia Porphyry Cu-Mo ± Re ± Au Deposit in NE Greece" Minerals 10, no. 2: 182. https://doi.org/10.3390/min10020182

APA Style

Melfos, V., Voudouris, P., Melfou, M., Sánchez, M. G., Papadopoulou, L., Filippidis, A., Spry, P. G., Schaarschmidt, A., Klemd, R., Haase, K. M., Tarantola, A., & Mavrogonatos, C. (2020). Mineralogical Constraints on the Potassic and Sodic-Calcic Hydrothermal Alteration and Vein-Type Mineralization of the Maronia Porphyry Cu-Mo ± Re ± Au Deposit in NE Greece. Minerals, 10(2), 182. https://doi.org/10.3390/min10020182

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