The isotopic signature of the mineralizing fluid of the Lavrion carbonate-replacement Pb-Zn-Ag district

dc.contributor.author Tombros, S. F.
dc.contributor.author St. Seymour, K.
dc.contributor.author Spry, Paul
dc.contributor.author Spry, Paul
dc.contributor.author Bonsall, T. A.
dc.contributor.department Geological and Atmospheric Sciences
dc.date 2021-04-16T14:03:04.000
dc.date.accessioned 2021-04-30T08:15:15Z
dc.date.available 2021-04-30T08:15:15Z
dc.date.copyright Sun Jan 01 00:00:00 UTC 2017
dc.date.embargo 2021-04-16
dc.date.issued 2010-05-01
dc.description.abstract <p>The Pb-Zn-Ag carbonate-replacement deposits in the Lavrion district are genetically related to a 7- 10 Ma-old granodiorite, felsic dikes and sills. These deposits are hosted in the Upper and Lower marble and schists of the Cyclades Blueschist unit and occur along the major Legraina detachment fault. Carbonate-replacement orebodies occur as “mantos” and veins, dominated by base metal sulfides and Ag, Bi, Sn, Sb, As, and Pb sulfosalts. Calculated carbon and oxygen isotope compositions of the hydrothermal fluid range from δ13CCO2 of -13.7 to 0.8 per mil and δ18OH2O of 4.2 to 27.4 per mil, at 400º, 350º, 320º, 300º, 250º and 200ºC. These isotopic compositions reveal water-torock ratios ranging from 4.8 to 52.6%, which reflect intense interaction of the ore fluid with the host rock in a water-dominated, transitional closed to open hydrothermal system. The range of δ34SH2S for sulfides in the deposits were from -8.5 to 6.8 per mil, for similar temperatures, whereas for barite-fluorite veins from δ34SH2S of -43.6 to -16.4 per mil, at 200º, 150º and 100ºC. This range implies that there was contribution from a magmatic sulfur component exsolved from the Plaka pluton, as well as contribution from a metasedimentary component. Based on the isotopic signature of sulfur for barite, the ranges from -6.7 to -7.6, comprising an increase in the fluid influx. Isotopic temperatures based on pyrite-galena and sphalerite-pyrite pairs revealed at least three major events of carbonate-replacement ore deposition, (i) at ~ 360º, (ii) 320º-280º and (iii) 260º-200ºC.</p>
dc.description.comments <p>This proceeding is published as Tombros, S. F., K. Seymour, P. G. Spry, and T. A. Bonsall. "The isotopic signature of the mineralizing fluid of the Lavrion carbonate-replacement Pb-Zn-Ag district." <em>Bulletin of the Geological Society of Greece</em> 43, no. 5 (2010): 2406-2416. doi:<a href="https://doi.org/10.12681/bgsg.11641" id="x-x-pub-id::doi">10.12681/bgsg.11641</a>.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/ge_at_conf/15/
dc.identifier.articleid 1013
dc.identifier.contextkey 22511294
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath ge_at_conf/15
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/105058
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/ge_at_conf/15/2010_Spry_IsotopicSignature.pdf|||Fri Jan 14 20:34:03 UTC 2022
dc.source.uri 10.12681/bgsg.11641
dc.subject.disciplines Geochemistry
dc.subject.disciplines Geology
dc.subject.disciplines Mineral Physics
dc.subject.keywords polymetallic ores
dc.subject.keywords ore fluid
dc.subject.keywords carbon
dc.subject.keywords oxygen
dc.subject.keywords sulfur isotopes
dc.title The isotopic signature of the mineralizing fluid of the Lavrion carbonate-replacement Pb-Zn-Ag district
dc.type article
dc.type.genre conference
dspace.entity.type Publication
relation.isAuthorOfPublication a62262dd-880b-4366-b68a-552fccbdcab4
relation.isOrgUnitOfPublication 29272786-4c4a-4d63-98d6-e7b6d6730c45
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