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ASSESSMENT ON HYDROTHERMAL PARTICLE CHEMISTRY FROM A SHALLOW VENTING SYSTEM OFFSHORE KOS, AEGEAN SEA

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P. Megalovasilis
P. Megalovasilis

Abstract


Shallow submarine hydrothermal vents along Hellenic Volcanic Arc transfer significant quantities of particles enriched in basic metals. Fluids collected by scuba diving from two shallow hydrothermal venting areas on Kos Island in the Aegean Sea in East Mediterranean. Samples were filtrated and membrane filters leached with a mixture of acids. Chemical analysis performed in suspended particles for Fe, Mn, Cu, Pb, Cd, Ca, Ba, Sr, Li, Al and Si. The suspended particulate matter (SPM) flux varied from 0.93 to 8.64 mg/l and between 0.21 and 20.94 mg/l in two sites. Metal/Al ratios also vary significantly within a short distance. The pH of hydrothermal waters was from 5.50 to 5.95 in Kephalos Bay and from 6.09 to 6.53 in Bros Thermi suggesting gases CO2 and H2S may control pH values. Particles were dominated by Fe, Ca, Si and Al and strongly enriched in Mn, Cu, Pb and Ba. Three geochemical groups were identified being associated with distinct hydrothermal processes concerning sulphide minerals, carbonate substrate and deeper Al-Silicate rock basement


Keywords


particulate matter; basic metals; vents; Hellenic Volcanic Arc

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References


Aliani, S., Meloni, R. and Dando, P.R., 2004. Periodicities in sediment temperature time-series at a

marine shallow water hydrothermal vent in Milos Island (Aegean Volcanic arc, Eastern

Mediterranean), Journal of Marine Systems, 46(1-4), 109-119.

Bachmann, O., Deering, C.D., Ruprecht, J.S., Huber, C., Skopelitis, A. and Schnyder, C., 2012.

Evolution of silicic magmas in the Kos-Nisyros volcanic center, Greece: cycles associated

with caldera collapse, Contributions to Mineralogy and Petrology, 163(1), 151-166.

Balopoulos, E.T., Theocharis, A., Kontoyiannis, H., Varnavas, S., Voutsinou-Taliadouri, F., Iona,

A., Souvermezoglou, A., Ignatiades, L., Gotsis-Skretas, O. and Pavlidou, A., 1999. Major

advances in the oceanography of the southern Aegean Sea-Cretan Straits system (eastern

Mediterranean), Progress in Oceanography, 44(1-3), 109-130.

Bostrom, K., Peterson, M.N.A., Joensuu, O. and Fisher, D.E., 1969. Aluminum-poor

ferromanganoan sediments on active oceanic ridges, Journal of Geophysical Research,

(12), 3261-3270.

Chester, R. and Jickells, T.D., 2012. Marine Geochemistry, 3rd Edition. Wiley-Blackwell.

Dando, P.R., Hughes, J.A., Leahy, Y., Niven, S.J., Taylor, L.J. and Smith, C., 1995. Gas venting

rates from submarine hydrothermal areas around the island of Milos, Hellenic Volcanic Arc,

Continental Shelf Research, 15(8), 913-929.

Dando, P.R., Thomm, M., Arab, H., Brehmer, M., Hooper, L.E., Jochimsen, B., Schlesner, H., Stohr, R.,

Miquel, J.C. and Fowler, S.W., 1998. Microbiology of shallow hydrothermal sites off Palaeochori

Bay, Milos (Hellenic Volcanic Arc), Cahiers de Biologie Marine, 39(3-4), 369-372.

Dando, P. R., Aliani, S., Arab, H., Bianchi, C.N., Brehmer, M., Cocito, S., Fowler, S.W., Gundersen,

J., Hooper, L.E., Kolbl, R., Kuever, J., Linke, P., Makropoulos, K.C., Meloni, R., Miquel, J.C.,

Morri, C., Muller, S., Robinson, C., Schlesner, H., Sievert, S., Stohr, R., Stuben, D., Thomm,

M., Varnavas, S.P. and Ziebis, W., 2000. Hydrothermal studies in the aegean sea, Physics and

Chemistry of the Earth, Part B: Hydrology, Oceans and Atmosphere, 25(1), 1-8.

Edmonds, H.N. and German, C.R., 2004. Particle geochemistry in the Rainbow hydrothermal plume,

Mid-Atlantic Ridge, Geochimica et Cosmochimica Acta, 68(4), 759-772.

Godelitsas, A., Price, R.E. Pichler, T., Amend, J., Gamaletsos, P. and Goettlicher, J., 2015.

Amorphous As-sulfide precipitates from the shallow-water hydrothermal vents off Milos

Island (Greece), Marine Chemistry, 177(5), 687-696.

Hatzivasileiou, V., 2013. History of Island of Kos Ancient, Medieval and Modern, Municipality of

Kos, Kos Greece.

Humphris, S.E., Zierenberg, R.A., Mullineaux, L.S. and Thomson, R.E., 1995. Seafloor

Hydrothermal Systems:Physical, Chemical, Biological, and Geological Interactions, AGU

Monograph 91 American Geophysical Union, Willey, Washington, DC. 466.

Karageorgis, A.P. and Anagnostou, C.L., 2001. Particulate matter spatial-temporal distribution and

associated surface sediment properties: Thermaikos Gulf and Sporades Basin, NW Aegean

Sea, Continental Shelf Research, 21, 2141-2153.

Lagios, E., Galanopoulos, D., Hobbs, B.A. and Dawes, G.J.K., 1998. Two-dimensional

magnetotelluric modelling of the Kos Island geothermal region (Greece), Tectonophysics,

(1-4), 157-172.

Landing, W.M. and Lewis, B.L., 1991. Collection, processing and analysis of marine particulate and

colloidal material for transition metals. In: Marine Particles: Analysis and Characterization,

Spencer, D. and Hurd, D., eds., Geophys. Monog. AGU, 63, 263-272.

Loring, D.H. and Rantala, R.T.T., 1992. Manual for the geochemical analyses of marine sediments

and suspended particulate matter, Earth Sciences Reviews, 32, 235-283.

Lupton, J.E., 1995. Hydrothermal plumes: near and far fields. In: Humphries, S.E., Zierenberg, R.A.,

Mullineaux, L.S., et al., eds., Seafloor Hydrothermal Systems: Physical, Chemical, Biological and

Geological Interactions, American Geophysical Union 91, Washington D.C., 317-346.

Megalovasilis, P., 2007. Geochemical research on sediments and waters in submarine hydrothermal

areas along the Aegean Volcanic Arc (in Greek with English Abstract) Ph.D, Thesis, Athens,

National and Kapodistrian University of Athens.

Megalovasilis, P., 2014. Partition geochemistry of hydrothermal precipitates from submarine hydrothermal

fields in the Hellenic Volcanic Island Arc, Geochemistry International, 52(11), 992-1010.

Megalovasilis, P. and Godelitsas, A., 2015. Hydrothermal influence on nearshore sediments of Kos

Island, Aegean Sea, Geo-Marine Letters, 35(2), 77-89.

Megalovasilis, P., 2015a. Evaluation of hydrothermal SPM inputs in Aegean Sea. In: 11th

Panhellenic Symposium on Oceanography and Fisheries, «Aquatic Horizons: Challenges &

Perspectives», Hellenic Centre for Marine Research, 1, 365-368.

Megalovasilis, P., 2015b. Hydrothermal fluid particle geochemistry of submarine vents in Kos

Island, Aegean Sea East Mediterranean, Journal of Marine Systems, Submitted: 1-25.

Minissale, A., Duchi, V., Kolios, N., Nocenti, M. and Verrucchi, C., 1997. Chemical patterns of thermal

aquifers in the volcanic islands of the Aegean Arc, Greece, Geothermics, 26(4), 501-518.

Nomikou, P., Papanikolaou, D., Alexandri, M., Sakellariou, D. and Rousakis, G., 2013. Submarine

volcanoes along the Aegean volcanic arc, Tectonophysics, 597-598(0), 123-146.

Papanikolaou, D. and Lekkas, E., 1990. Miocene tectonism in Kos, Dodecanese islands, IESCA

Abstract, 179-180.

Parson, L., Walker, C.L. and Dixon, D.R.E., 1995. Hydrothermal vents and processes. Geological

Society London.

Pe-Piper, G., Piper, D.J.W. and Perissoratis, C., 2005. Neotectonics and the Kos Plateau Tuff

eruption of 161 ka, South Aegean arc, Journal of Volcanology and Geothermal Research,

(3-4), 315-338.

Pichon, X.L. and Angelier, J., 1979. The Hellenic arc and trench system: a key to the neotectonic

evolution of the eastern mediterranean area, Tectonophysics, 60(1-2), 1-42.

Price, R.E., Savov, I., Planer-Friedrich, B., Bühringa, S.I., Amendb, J. and Pichlera, T., 2013. Processes

influencing extreme As enrichment in shallow-sea hydrothermal fluids of Milos Island, Greece,

Chemical Geology, 348, 15-26.

Royden, L.H. and Papanikolaou, D.J., 2011. Slab segmentation and late Cenozoic disruption of the

Hellenic arc, Geochemistry, Geophysics, Geosystems, 12(3), 1-24.

Ruffa, G.L., Panichi, C., Kavouridis, T. et al., 1999. Isotope and chemical assessment of geothermal

potential of Kos Island, Greece, Geothermics, 28(2), 205-217.

Varnavas, S., Megalovasilis, P., Panagiotaras, D. et al., 1998. Compositional and morphological

characterisation of particulate matter in hydrothermal fields of the Hellenic Volcanic arc, In:

XXIII General Assembly of European Geophysical Society (EGS), Part II Hydrology,

Oceans & Atmospere, European Geophysical Society, Annales Geophysicae, Supplement II

to Volume 16, 16, C 744.

Varnavas, S., Panagiotaras, D. and Megalovasilis, P., 1998. Chemical characteristics of a submarine

hydrothermal system offshore Kos island, on the Hellenic Volcanic Arc. Rapports et Procès-

Verbaux de la Commission Internationale Pour L'Exploration Scientifique de la mer

Mediterranee, 35th CIESM Congress,, 35(1), 104-105.

Varnavas, S.P. and Cronan, D.S., 1991. Hydrothermal metallogenic processes off the islands of

Nisiros and Kos in the Hellenic Volcanic Arc, Marine Geology, 99(1-2), 109-133.

Varnavas, S.P., Panagiotaras, D. and Megalovasilis, P. et al., 2000. Compositional characterization

of suspended particulate matter in hellenic volcanic arc hydrothermal centres, Physics and

Chemistry of the Earth, Part B: Hydrology, Oceans and Atmosphere, 25(1), 9-18.

Von Damm, K.L., Edmond, J.M., Measures, C.I., et al., 1985. Chemistry of submarine hydrothermal

solutions at Guaymas Basin, Gulf of California, Geochim. Cosmochim. Acta, 49, 2221-2237.

Von Damm, K.L., 1990. SeaSoor hydrothermal activity: black smoker chemistry and chimneys,

Annual Review of Earth and Planetary Science, 18, 173-204.

Von Damm, K.L., 2001. Chemistry of hydrothermal vent fluids. In: Steele, J.H., ed., Encyclopedia of

Ocean Sciences, Academic Press Oxford, 3, Cambridge, Massachusetts USA, 1246-1253.

Whittield, M. and Turner, R.D., 1987. The role of particles in regulating the composition of sea

water. In: Stumm, W., ed., Aquatic Surface Chemistry: Chemical Processes at the Particle -

Water Interface, John Wiley N.Y., New York, 457-493.

Yücel, M., Sievert, S.M., Vetriani, C. et al., 2013. Eco-geochemical dynamics of a shallow-water

hydrothermal vent system at Milos Island, Aegean Sea (Eastern Mediterranean), Chemical

Geology, 356(0), 11-20.


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