Absolute timing of sulfide and gold mineralization: A comparison of Re-Os molybdenite and Ar-Ar mica methods from the Tintina Gold Belt, Alaska

D. Selby, R.A. Creaser, Craig Hart, C.S. Rombach, J.F.H. Thompson, M.T. Smith, A.A. Bakke, R.J. Goldfarb

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    151 Citations (Scopus)

    Abstract

    New Re-Os molybdenite dates from two lode gold deposits of the Tintina Gold Belt, Alaska, provide direct timing constraints for sulfide and gold mineralization. At Fort Knox, the Re-Os molybdenite date is identical to the U-Pb zircon age for the host intrusion, supporting an intrusive-related origin for the deposit. However, Ar-40/Ar-39 dates from hydrothermal and igneous mica are considerably younger. At the Pogo deposit, Re-Os molybdenite dates are also much older than Ar-40/Ar-39 dates from hydrothermal mica, but dissimilar to the age of local granites. These age relationships indicate that the Re-Os molybdenite method records the timing of sulfide and gold mineralization, whereas much younger Ar-40/Ar-39 dates are affected by post-ore thermal events, slow cooling, and/or systemic analytical effects. The results of this study complement a growing body of evidence to indicate that the Re-Os chronometer in molybdenite can be an accurate and robust tool for establishing timing relations in ore systems.
    Original languageEnglish
    Pages (from-to)791-794
    JournalGeology
    Volume30
    DOIs
    Publication statusPublished - 2002

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