The Profitis Ilias deposit, Milos island, Greece : a case study of boiling in an epithermal system recorded by stable isotope and fluid inclusion data

Naden, J.; Kilias, S.P.; Leng, M.J. ORCID: https://orcid.org/0000-0003-1115-5166; Cheliotis, I.; Shepherd, T.J.; Spiro, B.. 1999 The Profitis Ilias deposit, Milos island, Greece : a case study of boiling in an epithermal system recorded by stable isotope and fluid inclusion data. In: Stanley, C.J., (ed.) Mineral deposits : processes to processing. Rotterdam, Netherlands, Balkema, 63-66.

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Abstract/Summary

Stable isotope (δD and δ18O) and microthermometric data are presented for the Profitis Ilias adularia-sericite-type epithermal gold deposit on Milos Island, Greece. The deposit was discovered by Midas Enterprise SA, and estimated reserves are 5 million tonnes grading at 4.4 g/t Au and 43 ppm Ag. Microther-mometric data show that the system boiled. Stable isotope ratios were determined on inclusion-fluids (δD and δ18O) and vein quartz (δ18O). The inclusion-fluid data show fractionation trends consistent with single–stage steam separation and are broadly comparable to the currently active Milos geothermal system. The trends and comparisons in the fluid-mineral data are more difficult to interpret. This suggests that data derived by ana-lysing both δD and δ18O on inclusion-fluids can provide a better framework for interpreting fluid processes in epithermal systems than current methodologies based on calculating δ18O from fluid-quartz equilibria.

Item Type:	Publication - Book Section
Programmes:	BGS Programmes > Economic Minerals
ISBN:	905809068X
NORA Subject Terms:	Earth Sciences
Date made live:	10 Sep 2010 10:06 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/7725

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