Campus Units

Geological and Atmospheric Sciences

Document Type

Conference Proceeding

Publication Version

Published Version

Publication Date

5-2010

Journal or Book Title

Bulletin of the Geological Society of Greece

Volume

43

Issue

5

First Page

2406

Last Page

2416

DOI

10.12681/bgsg.11641

Conference Title

12th International Congress of the Geological Society of Greece

Conference Date

May 19-22, 2010

City

Patras, Greece

Abstract

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.

Comments

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." Bulletin of the Geological Society of Greece 43, no. 5 (2010): 2406-2416. doi:10.12681/bgsg.11641.

Creative Commons License

Creative Commons Attribution-Noncommercial 4.0 License
This work is licensed under a Creative Commons Attribution-Noncommercial 4.0 License

Copyright Owner

S.F. Tombros, K. Seymour, P.G. Spry, T.A Bonsall

Language

en

File Format

application/pdf

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