THE KONDAROS-KATSIMOUTI INTERMEDIATESULFIDATION EPITHERMAL PB-ZN-AG-MN MINERALIZATION, WESTERN MILOS, GREECE: NEW MINERALOGICAL AND GEOCHEMICAL DATA


Published: Jul 28, 2016
Keywords:
Silver sulfosalts tungsten epithermal boiling-mixing Milos island
K. Papavasiliou
P. Voudouris
C. Kanellopoulos
D. Alfieris
S. Xydous
Abstract

 The metallic mineralization in Kontaros-Katsimouti area is an epithermal Pb-Zn Ag mineralization located along the NW-trending Kondaros-Katsimouti-Vani fault, NW Milos Island, Greece. It is hosted within propylitically and argillically altered dacitic flow dome and volcaniclastic sandstone and shows features typical of intermediate sulfidation deposits like colloform banding, cockade breccias and gangue adularia, Mnrich carbonates and amethystine quartz. The Kondaros-Katsimouti system evolves at higher elevation into the Vani Ag-Pb mineralization, which occurs proximal to the Vani manganese deposit. The metallic mineralogical assemblage at Kondaros-Katsimouti includes mainly galena and sphalerite and minor pyrite. Silver is present in the form of Ag-(Cd) rich tetrahedrite (up to 23.1 wt. % Ag) and polybasite included in galena. Bulk ore analyses indicate enrichment in W (up to 424 mg/kg) and Mo (up to 24 mg/kg), similarly to the other neighboring mineralizations in western Milos (e.g. Vani, TriadesGalana). This enrichment suggests a magmatic-hydrothermal contribution to the ore fluids, probably from a buried granitoid at depth. Boiling, in addition to mixing processes between magmatic- and seawater, resulted in pH increase, oxidation and temperature decrease, and resulted into ore deposition.

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  • Petrology and Mineralogy
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References
Alfieris, D., 2006. Geological, geochemical and mineralogical studies of shallow submarine
epithermal mineralization in an emergent volcanic edifice, at western Milos island, Greece.
PhD thesis, University of Hamburg, Germany, 211 pp.
Alfieris, D. and Voudouris, P., 2005. Ore mineralogy of transitional submarine to subaerial
magmatic-hydrothermal deposits in W. Milos, Greece. In: Cook, N.G. and Bonev, I., eds.,
Au-Ag-Te-Se deposits, Geochemistry, Mineralogy and Petrology, 43, Sofia, 1-6.
Alfieris, D., Voudouris, P. and Spry, P.G., 2013. Shallow submarine epithermal Pb-Zn-Cu-Au-Ag-
Te mineralization on western Milos Island, Aegean Volcanic Arc, Greece: Mineralogical,
Geological and Geochemical constraints, Ore Geology Reviews, 53, 159-180.
Altherr, R. and Siebel, W., 2002. I-type plutonism in a continental back-arc setting: Miocene granitoids
and monzonites from the central Aegean Sea, Greece, Contrib. Mineral. Petrol., 143, 397-415.
Fournier, R.O., 1985. The behaviour of silica in hydrothermal solutions, In: Berger, B.R. and Bethke,
P.M., eds., Geology and geochemistry of epithermal systems, Rev. Econ. Geol., 2, 45-61.
Fytikas, M., Innocenti, F., Kolios, N., Manneti, P., Mazzuoli, R., Poli, G., Rita, F. and Villari, L.,
Volcanology and petrology of volcanic products from the island of Milos and
neighbouring islets, J. Volcanol. Geotherm. Res., 28, 297-317.
KA-
A
KA-
B
KA-
KA-
KA-
KA-
Q
KO-
KO-
Na2O % 0.17 0.05 0.08 0.81 0.17 0.06 0.05 0.03
K2O % 0.31 0.06 0.24 0.16 0.14 0.09 0.06 0.03
MgO % 0.25 0.46 0.17 0.53 0.03 0.02 0.16 0.01
CaO % 15.24 47.54 13.39 45.61 0.03 0.03 3.67 0.12
Al2O3 % 0.65 0.10 0.62 0.08 0.61 0.44 0.23 0.11
TiO2 % 0.01 bdl 0.01 bdl bdl bdl bdl bdl
MnO % 0.99 8.32 0.73 10.15 0.06 0.03 0.73 0.04
Fe2O3 % 1.82 1.86 2.97 1.56 1.15 1.73 2.13 0.11
Zn % 16.5 0.15 14.2 0.12 8.17 4.38 6.70 1.52
Pb % 2.65 0.03 2.83 0.05 29.8 0.75 21.8 0.36
Cu % 0.04 0.002 0.05 0.002 0.08 0.03 0.03 0.002
Ba % 0.01 0.003 0.01 0.02 0.002 0.001 0.001 0.21
As mg/kg 14 4 42 4 8 18 36 1
Sb mg/kg 68 1 42 0 178 94 243 46
Ni mg/kg 22 16 24 16 26 27 26 27
Co mg/kg 31 30 42 18 22 98 20 123
W mg/kg 49 26 159 bdl 94 439 2 424
Cd mg/kg 769 7 622 3 410 207 247 86
Mo mg/kg 23 4 24 4 10 5 9 2
Tl mg/kg 0.26 0.30 0.26 0.10 0.54 0.05 0.62 0.01
Bi mg/kg 0.03 bdl 0.05 bdl 0.26 0.01 1.05 bdl
Glasby, G.P., Papavassiliou, C.T., Mitsis, J., Valsami-Jones, E., Liakopoulos, A. and Renner, R.M.,
The Vani manganese deposit, Milos island, Greece: a fossil stratabound Mn-Ba-Pb-
Zn-As-Sb-W-rich hydrothermal deposit. In: Fytikas, M. and Vougioukalakis, G.E., eds., The
South Aegean Active Volcanic Arc: Present Knowledge and Future Perspectives.
Developments in Volcanology, 7. Elsevier, 255-291.
Grancea, L., Bailly, L., Leroy, J., Banks, D., Marcoux, E., Milési, J.P., Cuney, M., André, A.S.,
Istvan, D. and Fabre, C., 2002. Fluid evolution in the Baia Mare epithermal gold /polymetallic
district, Inner Carpathians, Romania, Mineral. Deposita, 37, 630-647.
Hauck, M., 1988. Kuroko-type ore deposits on the Aegean Islands, Greece. In: Friedrich, G.M. and
Herzig, P.M., eds., Base metal sulfide deposits. Springer Verlag, Berlin, 216-228.
Hein, J.R., Stamatakis, M.G. and Dowling, J.S., 2000. Trace metal-rich Quaternary hydrothermal
manganese oxide and barite deposit, Milos Island, Greece, Trans Inst Min Metall, 109, 67-76.
Jolivet, L. and Brun, J.P., 2010. Cenozoic geodynamic evolution of the Aegean region, Int. J. Earth Sci., 99, 109-138.
Kilias, S.P., Naden, J., Cheliotis, I., Shepherd, T.J., Constandinidou, H., Crossing, J. and Simos, I.,
Epithermal gold mineralisation in the active Aegean volcanic arc: The Profitis Ilias
deposit, Milos Island, Greece, Miner. Deposita, 36, 32-44.
Kilias, S.P., Nomikou, P., Papanikolaou, D., Polymenakou, P.N., Godelitsas, A., Argyraki, A.,
Carey, S., Gamaletsos, P., Mertzimekis, T.J., Stathopoulou, E. and Goettlicher, J., 2013. New
insights into hydrothermal vent processes in the unique shallow-submarine arc-volcano,
Kolumbo (Santorini), Greece, Scientific Reports, 3, 2421, 1-13.
Liakopoulos, A, Glasby, G.P., Papavassiliou, C.T. and Boulegue, J., 2001. Nature and origin of the
Vani manganese deposit, Milos, Greece: an overview, Ore Geol. Rev., 18, 181-209.
Marschik, R., Bauer, T., Hensler, A.S., Skarpelis, N. and Holzl, S., 2010. Isotope Geochemistry of the Pb-Zn-
Ba (-Ag-Au) Mineralization at Triades-Galana, Milos Island, Greece, Res. Geology, 60, 335-347.
Mercier-Langevin, P., Hannington, M.D., Dubé, B. and Bécu, V., 2011. The gold content of
volcanogenic massive sulfide deposits, Miner. Deposita, 46, 509-539.
Naden, J., Kilias, S.P. and Darbyshire, D.B.F., 2005. Active geothermal systems with entrained seawater
as analogues for transitional continental magmato-hydrothermal and volcanic-hosted massive
sulfide mineralization-the example of Milos Island, Greece, Geology, 33, 541-544.
Papanikolaou, D.J., 1987. Tectonic evolution of the Cycladic blueschist belt (Aegean Sea, Greece). In:
Helgeson, H.C., ed., Chemical transport in metasomatic processes: NATO ASI series, 218, 429-450.
Raith, J.G., 1988. Tourmaline rocks associated with stratabound scheelite mineralization in the
Austroalpine crystalline complex, Austria, Mineral. Petrol., 39, 265-288.
Raith, J.G., 2013. Stratabound tungsten deposits in the Alps revisited in the light of new age data,
Geophysical Research Abstracts, Vol. 15, EGU2013-5095, 2013 EGU General Assembly.
Ring, U., Glodny, J., Will, T. and Thomson, S., 2010. The Hellenic subduction system: high pressure metamorphism,
exhumation, normal faulting, and large-scale extension, Ann. Rev. Earth Planet. Sci., 38, 45-76.
Sack, R.O., 2005. Internally consistent database for sulfides and sulfosalts in the system Ag2S-Cu2SZnS-
FeS-Sb2S3-As2S3: Update, Geoch. Cosmoch. Acta, 69, 1157-1164.
Sillitoe, R.H. and Hedenquist, J.W., 2003. Linkages between volcanotectonic settings, ore-fluid
compositions, and epithermal precious-metal deposits, Soc. Econ. Geol., Special Publ., 10, 315-343.
Spry, P.G., Peter, J.M. and Slack, J.M. 2000. Metaexalites as exploration guides to ores, Rev. Econ.
Geol., 11, 163-201.
Stewart, A.L. and McPhie, J., 2006. Facies architecture and Late Pliocene-Pleistocene evolution of
a felsic volcanic island, Milos, Greece, Bull. Volcanol., 68, 703-726.
Vavelidis, M. and Melfos, V., 1997. Two plumbian tetrahedrite-tennantite occurrences from
Maronia area (Thrace) and Milos island (Aegean Sea, Greece), Eur. J. Mineral., 9, 653-657.
Vavelidis, M. and Melfos, V., 1998. Fluid inclusion evidence for the origin of the barite silver-gold-bearing Pb-
Zn mineralization of the Triades area, Milos Island, Greece, Bull. Geol. Soc. Greece, 32, 137-144.
Voudouris, P., Xydous, S., Alfieris, D., Veligrakis, Th., Papavasiliou, C., Kanellopoulos, C. and
Falalakis, G., 2014. Silver-rich sulfide mineralization at Vani, western Milos Island, Greece:
New mineralogical evidence for epithermal ore deposition in a shallow submarine environment,
Proceedings of XX CBGA Congress, Tirana, Albania. Bul. Shk. Gjeol., 1/2014, 187-190.
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