Fluid inclusion thermometric and stable isotope (δ180-δD) evidence for "cryptic boiling" in the Profitis Ilias epithermal gold deposit, Milos: a potential exploration tool for epithermal gold

PDF (English)
Δημοσιευμένα: янв. 1, 2001
DOI: https://doi.org/10.12681/bgsg.17152
S. P. KILIAS
Εθνικό και Καποδιστριακό Πανεπιστήμιο Αθηνών
J. NADEN
British Geological Survey
M. LENG
British Geological Survey (NERC Isotope Geosciences Laboratory)
I. CHELIOTIS
Ι.Γ.Μ.Ε.
Περίληψη

"Cryptic boiling" has been disclosed throughout the vertical extent of the Profitis Ilias epithermal system ('450 m) by assessing systematic variations in fluid inclusion and stable isotope (δ180-δD)data in relation to elevation. Highest gold grades (Au: 2-57.9 g/t) are preferentially concentrated in the upper 200-250 m of the system in a "steam-dominated zone" that is separated from a lower "liquid-dominated zone" (Au < 2 g/t). This distribution of gold may be due to colloidal transport in a boiling epithermal system. The identification of the base of the "steam-dominated zone" using fluid inclusion and stable isotope data may potentially guide exploration drilling to depths with high-grade gold ore in productive epithermal systems.

Λεπτομέρειες άρθρου
  • Ενότητα
  • Ενεργειακές Πρώτες Ύλες και Γεωθερμία
Creative Commons License

Αυτή η εργασία είναι αδειοδοτημένη υπό το CC Αναφορά Δημιουργού – Μη Εμπορική Χρήση 4.0.

Οι συγγραφείς θα πρέπει να είναι σύμφωνοι με τα παρακάτω: Οι συγγραφείς των άρθρων που δημοσιεύονται στο περιοδικό διατηρούν τα δικαιώματα πνευματικής ιδιοκτησίας επί των άρθρων τους, δίνοντας στο περιοδικό το δικαίωμα της πρώτης δημοσίευσης. Άρθρα που δημοσιεύονται στο περιοδικό διατίθενται με άδεια Creative Commons 4.0 Non Commercial και σύμφωνα με την οποία μπορούν να χρησιμοποιούνται ελεύθερα, με αναφορά στο/στη συγγραφέα και στην πρώτη δημοσίευση για μη κερδοσκοπικούς σκοπούς. Οι συγγραφείς μπορούν να: Μοιραστούν — αντιγράψουν και αναδιανέμουν το υλικό με κάθε μέσο και τρόπο, Προσαρμόσουν — αναμείξουν, τροποποιήσουν και δημιουργήσουν πάνω στο υλικό.

Λήψεις
Τα δεδομένα λήψης δεν είναι ακόμη διαθέσιμα.
Αναφορές
BODNAR, R.J., REYNOLDS, T.J. and KUEHN, C.A. (1985) Fluid inclusion systematics in epithermal systems. In: Berger, B.R. and Bethke, P.M. (Editors): Geology and Geochemistry of Epithermal systems—Reviews in Economic Geology (Vol.73-98 pp., Economic Geology Pub. Co., Texas.
DRUMMOND, S.E. and OHMOTO, H. (1985) Chemical evolution and mineral deposition in boiling hydrothermal systems. Econ. Geol, 80, 126-147.
HEDENQUIST, J.W. and HENLEY, R.W. (1985) The importance of C02 on freezing-point measurements of fluid inclusions — evidence from active geothermal systems and implications for epithermal ore deposition. Econ. Geol, 80, 1379-1406.
KAZAHAYA, K., and MATSUO, S. (1984) A new ball-milling method for extraction of fluid inclusions from minerals. Geochemical Journal, 19,45-54.
KTLIAS, S.P., NADEN, J., CHELIOTIS, I., SHEPHERD, T.J., CONSTANDINIDOU, H., CROSSING, J. and SIMOS, I. (2001) Epithermal gold mineralisation in the active Aegean Volcanic Arc. Miner. Deposita, 36, 32-44.
KISHTMA, N. and SAKAI, H. (1980) Oxygen-18 and deuterium determinations on a single water sample of a few milligrams. Analytical Chemistry, 52, 356-358.
LECUYER, C and O'NEIL, J.R. (1994) Stable isotope compositions of fluid inclusions in biogenic carbonates. Geochim. Cosmochim. Acta, 58, 353-363.
MICHAEL, C, PERDIKATSIS, V., DIMOU, E. and MARANTOS, I. (1995) Hydrothermal alteration and ore deposition in epithermal precious metal deposit of Agios Demetrios, Konos area, N. Greece. Geol. Soc. Greece Special Pubi, 4, 778-782.
MICHAEL, C. (1993) Geology and geochemistry of epithermal gold deposit in Konos area. Unpubl. I.G.M.E. report, 75 pp. (in Greek).
NADEN, J., KTLIAS, S., SHEPHERD, T.J., LENG, M., CHELIOTIS, I. and SPIRO, Β. (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. (Editors): Mineral Deposits: Processes to Processing, 63-66 pp. Balkema, Rotterdam.
O'NEIL, J.R., ADAMI, L.H. and EPSTEIN, S. (1975) Revised value for the l 80 fractionation between C02 and water at 25 °C. U.S. Geological Survey Journal of Research, 3, 623-624.
ROEDDER, E. and BODNAR, R.J.(1997) Fluid inclusion studies of hydrothermal ore deposits. In: Barnes, H.L. (Editor): Geochemistry of hydrothermal ore deposits, 657-698 pp., John Wiley & Sons, Inc. New York.
SAUNDERS, JA. and SCHOENLY, P.A. (1995) Boiling, colloid nucleation and aggregation, and the genesis of bonanza Au-Ag ores of the Sleeper deposit, Nevada. Miner. Deposita, 30,199-210.
SKARPELIS N. (1999a) The Aghios Fillipos ore deposit, Kirki (Western Thrace). A base metal part of a high sulfidation epithermal system. Bull. Geol. Soc. Greece, 33, 51-60.
SKARPELIS N. (1999b) Epithermal type ores in the Aegean. The hot spring mineralization of northern Chios island. Bull. Geol. Soc. Greece, 33, 61-68.
SKARPELIS N, VOUDOURIS P. and ARIKAS K. (1999) Exploration for epithermal gold in SW Thrace (Greece): New target areas. In: Stanley, C.J. et al. (Editors): Mineral Deposits: Processes to Processing, 589-592 pp., Balkema, Rotterdam.
WILKINSON, J.J. (2001) Fluid inclusions in hydrothermal ore deposits. Lithos, 55, 229-272.
Τα περισσότερο διαβασμένα άρθρα του ίδιου συγγραφέα(s)