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Isotope geochemistry of the Pb-Zn-Ba(-Ag-Au) mineralization at Triades-Galana, Milos Island, Greece
Department of Earth and Environmental Sciences, Ludwig-Maximilians Universität, München.
Department of Earth and Environmental Sciences, Ludwig-Maximilians Universität, München.
Department of Geology and Geoenvironment, University of Athens.
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2010 (English)In: Resource geology (Tokyo. 1998), ISSN 1344-1698, E-ISSN 1751-3928, Vol. 60, no 4, p. 335-347Article in journal (Refereed) Published
Abstract [en]

The Pb-Zn-Ba(-Ag-Au) mineralization in the Triades and Galana mine areas is hosted in 2.5-1.4 Ma pyroclastic rocks, and structurally controlled mostly by NE-SW or N-S trending brittle faults. Proximal pervasive silica and distal pervasive sericite-illite alteration are the two main alteration types present at the surface. The distribution of mineralization-alteration in the district suggests at least two hydrothermal events or that hydrothermal activity lasted longer at Galana. The Sr isotope signature of sphalerite and barite (87Sr/86Sr = 0.709162 to 0.710214) and calculated oxygen isotope composition of a fluid in equilibrium with barite and associated quartz at temperatures of around 230°C are suggestive of a seawater hydrothermal system and fluid/rock interaction. Lead isotope ratios of galena and sphalerite (206Pb/204Pb from 18.8384 to 18.8711; 207Pb/204Pb from 15.6695 to 15.6976; 208Pb/204Pb from 38.9158 to 39.0161) are similar to those of South Aegean Arc volcanic and Aegean Miocene plutonic rocks, and compatible with Pb derived from an igneous source. Galena and sphalerite from Triades-Galana have δ34SVCDT values ranging from +1 to +3.6‰, whereas barite sulfate shows δ34SVCDT values from +22.8 to +24.4‰. The sulfur isotope signatures of these minerals are explained by seawater sulfate reduction processes. The new analytical data are consistent with a seawater-dominated hydrothermal system and interaction of the hydrothermal fluid with the country rocks, which are the source of the ore metals.

Place, publisher, year, edition, pages
2010. Vol. 60, no 4, p. 335-347
National Category
Geology
Research subject
Ore Geology
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URN: urn:nbn:se:ltu:diva-11203DOI: 10.1111/j.1751-3928.2010.00139.xLocal ID: a1e2a370-e339-11df-8b36-000ea68e967bOAI: oai:DiVA.org:ltu-11203DiVA, id: diva2:984152
Note
Upprättat; 2010; 20101029 (tobbau)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-02-15Bibliographically approved

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