Isotope Geochemistry of the Pb‐Zn‐Ba(‐Ag‐Au) Mineralization at Triades‐Galana, Milos Island, Greece
Identifieur interne : 000074 ( Main/Exploration ); précédent : 000073; suivant : 000075Isotope Geochemistry of the Pb‐Zn‐Ba(‐Ag‐Au) Mineralization at Triades‐Galana, Milos Island, Greece
Auteurs : Robert Marschik [Allemagne] ; Tobias Bauer [Allemagne] ; Ana-Sophie Hensler [Allemagne] ; Nikos Skarpelis [Grèce] ; Stefan Hölzl [Allemagne]Source :
- Resource Geology [ 1344-1698 ] ; 2010-12.
Descripteurs français
English descriptors
- KwdEn :
- Authors resource geology, Ballanti, Barite, Barite sulfate, Brittle faults, Central aegean, Continental crust, Country rocks, Crust, Earth planet, Epithermal, Fytikas, Galana, Galena, Geochemical, Geochemistry, Geology, Homogenization temperatures, Hydrothermal, Hydrothermal activity, Hydrothermal events, Hydrothermal system, Isotope, Isotope geochemistry, Isotope ratios, Isotope signature, Lava, Main alteration types, Marschik, Mcphie, Melfos, Milo, Milos island, Mineral exploration, Mineralization, Naden, Normal faults, Pyroclastic rocks, Quartz, Resource geology, Resource geology mineralization, Seawater, Seawater hydrothermal system, Sphalerite, Stewart mcphie, Strontium, Sulfate, Sulfur, Sulfur isotope ratios, Tetrahedrite, Triades, Uids, Vavelidis, Vavelidis melfos, Voudouris.
- Teeft :
- Authors resource geology, Ballanti, Barite, Barite sulfate, Brittle faults, Central aegean, Continental crust, Country rocks, Crust, Earth planet, Epithermal, Fytikas, Galana, Galena, Geochemical, Geochemistry, Geology, Homogenization temperatures, Hydrothermal, Hydrothermal activity, Hydrothermal events, Hydrothermal system, Isotope, Isotope geochemistry, Isotope ratios, Isotope signature, Lava, Main alteration types, Marschik, Mcphie, Melfos, Milo, Milos island, Mineral exploration, Mineralization, Naden, Normal faults, Pyroclastic rocks, Quartz, Resource geology, Resource geology mineralization, Seawater, Seawater hydrothermal system, Sphalerite, Stewart mcphie, Strontium, Sulfate, Sulfur, Sulfur isotope ratios, Tetrahedrite, Triades, Uids, Vavelidis, Vavelidis melfos, Voudouris.
Abstract
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.
Url:
DOI: 10.1111/j.1751-3928.2010.00139.x
Affiliations:
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xml:lang="fr">Grèce</country><wicri:regionArea>Department of Geology and Geoenvironment, University of Athens, Panepistimioupoli, Athens</wicri:regionArea><placeName><settlement type="city">Athènes</settlement><region nuts="2" type="region">Attique (région)</region></placeName></affiliation></author><author><name sortKey="Holzl, Stefan" sort="Holzl, Stefan" uniqKey="Holzl S" first="Stefan" last="Hölzl">Stefan Hölzl</name><affiliation wicri:level="3"><country xml:lang="fr">Allemagne</country><wicri:regionArea>Bayerische Staatssammlung für Paläontologie und Geologie, München</wicri:regionArea><placeName><region type="land" nuts="1">Bavière</region><region type="district" nuts="2">District de Haute-Bavière</region><settlement type="city">Munich</settlement></placeName></affiliation></author></analytic><monogr></monogr><series><title level="j" type="main">Resource Geology</title><title level="j" type="alt">RESOURCE GEOLOGY</title><idno type="ISSN">1344-1698</idno><idno type="eISSN">1751-3928</idno><imprint><biblScope unit="vol">60</biblScope><biblScope unit="issue">4</biblScope><biblScope unit="page" from="335">335</biblScope><biblScope unit="page" to="347">347</biblScope><biblScope unit="page-count">13</biblScope><publisher>Blackwell Publishing Asia</publisher><pubPlace>Melbourne, Australia</pubPlace><date type="published" when="2010-12">2010-12</date></imprint><idno type="ISSN">1344-1698</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">1344-1698</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Authors resource geology</term><term>Ballanti</term><term>Barite</term><term>Barite sulfate</term><term>Brittle faults</term><term>Central aegean</term><term>Continental crust</term><term>Country rocks</term><term>Crust</term><term>Earth planet</term><term>Epithermal</term><term>Fytikas</term><term>Galana</term><term>Galena</term><term>Geochemical</term><term>Geochemistry</term><term>Geology</term><term>Homogenization temperatures</term><term>Hydrothermal</term><term>Hydrothermal activity</term><term>Hydrothermal events</term><term>Hydrothermal system</term><term>Isotope</term><term>Isotope geochemistry</term><term>Isotope ratios</term><term>Isotope signature</term><term>Lava</term><term>Main alteration types</term><term>Marschik</term><term>Mcphie</term><term>Melfos</term><term>Milo</term><term>Milos island</term><term>Mineral exploration</term><term>Mineralization</term><term>Naden</term><term>Normal faults</term><term>Pyroclastic rocks</term><term>Quartz</term><term>Resource geology</term><term>Resource geology mineralization</term><term>Seawater</term><term>Seawater hydrothermal system</term><term>Sphalerite</term><term>Stewart mcphie</term><term>Strontium</term><term>Sulfate</term><term>Sulfur</term><term>Sulfur isotope ratios</term><term>Tetrahedrite</term><term>Triades</term><term>Uids</term><term>Vavelidis</term><term>Vavelidis melfos</term><term>Voudouris</term></keywords><keywords scheme="Teeft" xml:lang="en"><term>Authors resource geology</term><term>Ballanti</term><term>Barite</term><term>Barite sulfate</term><term>Brittle faults</term><term>Central aegean</term><term>Continental crust</term><term>Country rocks</term><term>Crust</term><term>Earth planet</term><term>Epithermal</term><term>Fytikas</term><term>Galana</term><term>Galena</term><term>Geochemical</term><term>Geochemistry</term><term>Geology</term><term>Homogenization temperatures</term><term>Hydrothermal</term><term>Hydrothermal activity</term><term>Hydrothermal events</term><term>Hydrothermal system</term><term>Isotope</term><term>Isotope geochemistry</term><term>Isotope ratios</term><term>Isotope signature</term><term>Lava</term><term>Main alteration types</term><term>Marschik</term><term>Mcphie</term><term>Melfos</term><term>Milo</term><term>Milos island</term><term>Mineral exploration</term><term>Mineralization</term><term>Naden</term><term>Normal faults</term><term>Pyroclastic rocks</term><term>Quartz</term><term>Resource geology</term><term>Resource geology mineralization</term><term>Seawater</term><term>Seawater hydrothermal system</term><term>Sphalerite</term><term>Stewart mcphie</term><term>Strontium</term><term>Sulfate</term><term>Sulfur</term><term>Sulfur isotope ratios</term><term>Tetrahedrite</term><term>Triades</term><term>Uids</term><term>Vavelidis</term><term>Vavelidis melfos</term><term>Voudouris</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Géochimie</term><term>Géologie</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="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.</div></front></TEI><affiliations><list><country><li>Allemagne</li><li>Grèce</li></country><region><li>Attique (région)</li><li>Bavière</li><li>District de Haute-Bavière</li></region><settlement><li>Athènes</li><li>Munich</li></settlement></list><tree><country name="Allemagne"><region name="Bavière"><name sortKey="Marschik, Robert" sort="Marschik, Robert" uniqKey="Marschik R" first="Robert" last="Marschik">Robert Marschik</name></region><name sortKey="Bauer, Tobias" sort="Bauer, Tobias" uniqKey="Bauer T" first="Tobias" last="Bauer">Tobias Bauer</name><name sortKey="Hensler, Ana Ophie" sort="Hensler, Ana Ophie" uniqKey="Hensler A" first="Ana-Sophie" last="Hensler">Ana-Sophie Hensler</name><name sortKey="Holzl, Stefan" sort="Holzl, Stefan" uniqKey="Holzl S" first="Stefan" last="Hölzl">Stefan Hölzl</name><name sortKey="Marschik, Robert" sort="Marschik, Robert" uniqKey="Marschik R" first="Robert" last="Marschik">Robert Marschik</name></country><country name="Grèce"><region name="Attique (région)"><name sortKey="Skarpelis, Nikos" sort="Skarpelis, Nikos" uniqKey="Skarpelis N" first="Nikos" last="Skarpelis">Nikos Skarpelis</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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