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Open AccessArticle

Mineralogical Study of the Advanced Argillic Alteration Zone at the Konos Hill Mo–Cu–Re–Au Porphyry Prospect, NE Greece

1
Faculty of Geology & Geoenvironment, National and Kapodistrian University of Athens, 15784 Athens, Greece
2
Department of Geological and Atmospheric Sciences, Iowa State University, Ames, IA 50011, USA
3
Faculty of Geology, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
4
Institut für Mineralogie, Westfälische Wilhelms-Universität Münster, 48149 Münster, Germany
5
Eldorado Gold Corporation, 1188 Bentall 5 Burrard St., Vancouver, BC V6C 2B5, Canada
6
Department of Mineralogy, University of Geneva, CH-1205 Geneva, Switzerland
7
Goldcorp Inc., Park Place, Suite 3400-666, Burrard St., Vancouver, BC V6C 2X8, Canada
8
Center for Mineral Resources Science, Department of Geology and Geological Engineering, Colorado School of Mines, 1516 Illinois Street, Golden, CO 80401, USA
9
Department of Applied Geosciences and Geophysics, University of Leoben, 8700 Leoben, Austria
*
Author to whom correspondence should be addressed.
The paper is an extended version of our paper published in 1st International Electronic Conference on Mineral Science, 16–21 July 2018.
Minerals 2018, 8(11), 479; https://doi.org/10.3390/min8110479
Received: 8 October 2018 / Revised: 19 October 2018 / Accepted: 22 October 2018 / Published: 24 October 2018
The Konos Hill prospect in NE Greece represents a telescoped Mo–Cu–Re–Au porphyry occurrence overprinted by deep-level high-sulfidation mineralization. Porphyry-style mineralization is exposed in the deeper parts of the system and comprises quartz stockwork veins hosted in subvolcanic intrusions of granodioritic composition. Ore minerals include pyrite, molybdenite, chalcopyrite, and rheniite. In the upper part of the system, intense hydrothermal alteration resulted in the formation of a silicified zone and the development of various advanced argillic alteration assemblages, which are spatially related to N–S, NNW–SSE, and E–W trending faults. More distal and downwards, advanced argillic alteration gradually evolves into phyllic assemblages dominated by quartz and sericite. Zunyite, along with various amounts of quartz, alunite, aluminum phosphate–sulfate minerals (APS), diaspore, kaolinite, and minor pyrophyllite, are the main minerals in the advanced argillic alteration. Mineral-chemical analyses reveal significant variance in the SiO2, F, and Cl content of zunyite. Alunite supergroup minerals display a wide compositional range corresponding to members of the alunite, beudantite, and plumbogummite subgroups. Diaspore displays an almost stoichiometric composition. Mineralization in the lithocap consists of pyrite, enargite, tetrahedrite/tennantite, and colusite. Bulk ore analyses of mineralized samples show a relative enrichment in elements such as Se, Mo, and Bi, which supports a genetic link between the studied lithocap and the underlying Konos Hill porphyry-style mineralization. The occurrence of advanced argillic alteration assemblages along the N–S, NNW–SSE, and E–W trending faults suggests that highly acidic hydrothermal fluids were ascending into the lithocap environment. Zunyite, along with diaspore, pyrophyllite, and Sr- and Rare Earth Elements-bearing APS minerals, mark the proximity of the hypogene advanced argillic alteration zone to the porphyry environment. View Full-Text
Keywords: zunyite; alunite supergroup minerals; lithocap; porphyry-epithermal mineralization; Greece zunyite; alunite supergroup minerals; lithocap; porphyry-epithermal mineralization; Greece
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Mavrogonatos, C.; Voudouris, P.; Spry, P.G.; Melfos, V.; Klemme, S.; Berndt, J.; Baker, T.; Moritz, R.; Bissig, T.; Monecke, T.; Zaccarini, F. Mineralogical Study of the Advanced Argillic Alteration Zone at the Konos Hill Mo–Cu–Re–Au Porphyry Prospect, NE Greece. Minerals 2018, 8, 479.

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