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Geology; June 2001; v. 29; no. 6; p. 479-482; DOI: 10.1130/0091-7613(2001)029<0479:OIATEZ>2.0.CO;2
© 2001 Geological Society of America
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Oxygen isotope and trace element zoning in hydrothermal garnets: Windows into large-scale fluid-flow behavior

Douglas E. Crowe1, Lee R. Riciputi2, Sandra Bezenek3 and Alexander Ignatiev4

1 Department of Geology, University of Georgia, Athens, Georgia 30602, USA
2 Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831-6365, USA
3 Department of Geology, University of Georgia, Athens, Georgia 30602, USA
4 Russian Academy of Science, Far East Geological Institute, 159, Prospect 100-letya, Vladivostok 690022, Russia

Single garnet crystals from a large, multicyclic hydrothermal system in Far East Russia are strongly growth zoned. Microscale ion microprobe analysis reveals consistent intracrystalline patterns in oxygen isotope composition and boron and iron contents, reflecting evolution of the hydrothermal system from magmatic- to meteoric-dominated conditions, and repetitive influx of magmatic fluids. Large intracrystalline variations in oxygen isotope composition (>12{per thousand} {delta}18O) delimit temporal evolution of magmatic and meteoric fluid input within different portions of the hydrothermal system, and suggest that fluid-flow regimes differed between central and distal portions of the system. These results provide compelling evidence that microanalytical data can be extrapolated from intracrystalline scales to study macroscale processes in complex, large-scale fluid-rock systems.

Key Words: Russian Far East • ore deposits • skarn • stable isotopes • SIMS • hydrothermal systems




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