Next Article in Journal
Low Temperature Serpentinite Replacement by Carbonates during Seawater Influx in the Newfoundland Margin
Previous Article in Journal
Quantifying the Distribution Characteristics of Geochemical Elements and Identifying Their Associations in Southwestern Fujian Province, China
Open AccessArticle

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

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
Received: 18 January 2020 / Revised: 7 February 2020 / Accepted: 16 February 2020 / Published: 18 February 2020
(This article belongs to the Section Mineral Deposits)
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. View Full-Text
Keywords: porphyry deposit; potassic alteration; sodic-calcic alteration; vein-types; Maronia; Greece porphyry deposit; potassic alteration; sodic-calcic alteration; vein-types; Maronia; Greece
Show Figures

Graphical abstract

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.; Tarantola, A.; Mavrogonatos, C. 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.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop