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Maronia |
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Greece |
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Cu Mo Au
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Super Porphyry Cu and Au
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The Maronia porphyry copper-molybdenum occurrence is located 30 km south-east of Komotini in Thrace, north-eastern Greece, within the Circum Rhodope belt formed on the southern and western fringe of the Precambrian to lower Palaeozoic Rhodope Massif.
The geology of this part of the Circum Rhodope Belt is dominated by metamorphosed Mesozoic sedimentary and volcanic rocks (meta-conglomerates, meta-greywacke, quartzite, marbles and calc-schists in the lower sections of the sequence to greenschists, mica and talc schists and quartzite in the upper) and Tertiary volcanics. The marbles and schists are intruded by the Oligocene to Miocene Maronia pluton composed of gabbroic-monzogabbroic-monzonitic intrusives and a younger porphyritic microgranite that hosts the porphyry mineralisation.
The microgranite is overprinted by an alteration pattern that comprises an inner and lower pyritic phyllic (sericite-chlorite) zone that grades out into a surrounding propylitisation (calcite-chlorite-epidote) within the margins of the microgranite and surrounding country rocks. These phases are overprinted higher in the system by argillic alteration (kaolin and quartz). The last hydrothermal event is silicification associated with stockwork veining which contains chalcopyrite ±pyrite, and is most intense where overprinting the phyllic assemblage. Chalcopyrite-pyrite-molybdenite is concentrated in the silicified zones overprinting phyllic and propylitic alteration as veinlets, disseminations and segregations.
The deposit is a small, sub-economic occurrence with local gold rich intervals. It has only been subjected to limited drill testing, which included one intersection of 10 m @ 2 wt.% Cu, 12 g/t Au, 17 g/t Ag, regarded as possibly being associated with the high-sulphidation epithermal overprint. This epithermal event is characterised by a famatinite, tennantite and pyrophyllite alteration assemblage.
For more detail consult the reference(s) listed below.
The most recent source geological information used to prepare this decription was dated: 2002.
This description is a summary from published sources, the chief of which are listed below.
© Copyright Porter GeoConsultancy Pty Ltd. Unauthorised copying, reproduction, storage or dissemination prohibited.
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Selected References:
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Melfos, V., Vavelidis, M., Christofides, G. and Seidel, E., 2002 - Origin and evolution of the Tertiary Maronia Porphyry Copper-Molybdenum deposit, Thrace, Greece: in Mineralium Deposita v.37, pp. 648-668.
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Melfos, V., Voudouris, P., Melfou, M., Sanchez, M.G., Papadopoulou, L., Filippidis, A., Spry, P.G., Schaarschmidt, A., Klemd, R., Haase, K.M., Tarantola, A. and 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: in Minerals (MDPI) v.10, 26p. doi:10.3390/min10020182.
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Voudouris, P., Spry, P.G., Melfos, V., Haase, K., Klemd, R., Mavrogonatos, C., Repstock, A. and Alfieris, D., 2018 - Gold deposits in Greece: Hypogene ore mineralogy as a guide for precious and critical metal exploration: in International Electronic Conference on Mineral Science, 16 to 31 July, 2018, MDPI, Switzerland, Proceedings 13p.
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Porter GeoConsultancy Pty Ltd (PorterGeo) provides access to this database at no charge. It is largely based on scientific papers and reports in the public domain, and was current when the sources consulted were published. While PorterGeo endeavour to ensure the information was accurate at the time of compilation and subsequent updating, PorterGeo, its employees and servants: i). do not warrant, or make any representation regarding the use, or results of the use of the information contained herein as to its correctness, accuracy, currency, or otherwise; and ii). expressly disclaim all liability or responsibility to any person using the information or conclusions contained herein.
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