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Isotopic disturbance is also apparent in pyrite from the upper amphibolite lower granulite facies Harmin deposit in the Snow Lake belt, for which a ca. This result demonstrates the robustness of the pyrite chronometer, since the deposit was metamorphosed at ~ 660C during the 1815 Ma regional event.These results indicate that the Re-Os chronometers in pyrrhotite and chalcopyrite are readily disturbed at relatively low temperatures, and should be avoided for reliable primary age information in most cases. 276© Copyright 2007 The Geological Society of America (GSA), all rights reserved.The Hitachi VMS deposit is, therefore, classified as the oldest dated ore deposit in Japan.

A mixture of pyrite and pyrrhotite from the greenschist grade Trout Lake deposit yields scattered Re-Os results with an age' of 1.3), implies complete resetting of the Re-Os system in chalcopyrite during greenschist facies metamorphism. 1860 Ma Re-Os pyrite age, interpreted here to date a later ore depositional event, was determined for the Sherritt Gordon deposit, Kisseynew Domain.MORELLI, Ryan M., Earth and Atmospheric Science, Univ of Alberta, 2-04D Earth Sciences Building, Edmonton, AB T6G 2E3, [email protected] CREASER, Robert A., Earth and Atmospheric Sciences, University of Alberta, 1-26 Earth Sciences Building, Edmonton, AB T6G 2E3, Canada Re-Os geochronology of low-level' sulfide minerals is emerging as a viable technique for dating hydrothermal ore-forming events.However, the ability of common sulfide minerals to retain primary age information through subsequent thermal events is currently unknown.In contrast, the Re-Os pyrite geochronometer is quite robust, probably remaining systematically closed through temperatures as high as 660C. 100Metallogeny and Isotope Geochemistry New Approaches, New Perceptions, New Paradigms Colorado Convention Center: 50 PM- PM, Monday, 29 October 2007Geological Society of America Abstracts with Programs, Vol. Permission is hereby granted to the author(s) of this abstract to reproduce and distribute it freely, for noncommercial purposes.Permission is hereby granted to any individual scientist to download a single copy of this electronic file and reproduce up to 20 paper copies for noncommercial purposes advancing science and education, including classroom use, providing all reproductions include the complete content shown here, including the author information.

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