Abstract
The Tepeoba breccia-centered Cu-Mo-Au deposit is associated with the Miocene Eybek granodiorite complex in western Turkey. The ages for molybdenite samples in the hydrothermal breccia and two molybdenite samples in veins surrounding breccia, one in metasedimentary rocks and one in the granodiorite, were dated by the Re-Os method using a double Os spike. Re-Os ages of molybdenite are 25.03±0.14 and 25.11±0.14 Ma for the veins and 25.62±0.09 Ma for the breccia-hosted sample. These results indicate that the hydrothermal breccia in the Tepeoba deposit formed prior to the vein formation. We conclude, based on the Re-Os ages, that hydrothermal activity at Tepeoba lasted at least half a million years.
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