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    Geology and gold mineralization of the Richardson district, East-Central Alaska

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    Author
    Graham, Garth E.
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    URI
    http://hdl.handle.net/11122/6281
    Abstract
    The Richardson district contains multiple granitic units intruding gneiss and schist. The Bald Knob prospect contains gold-bearing quartz veins with the assemblage Bi-̊ Au-̊ hedleyite and high methane fluid inclusions. These features indicate very low fs₂-f₀₂ conditions, lower than any reported for 90 Ma interior Alaska gold systems, including the nearby Democrat and Buckeye prospects. The Bald Knob and Democrat Lode prospects returned ⁴⁰Ar/³⁹Ar ages of 1̃04 and 9̃0 Ma, respectively. Peraluminous dikes possess collisional tectonic signatures and interpreted age of 114 Ma. Younger dikes and 3 km² granite pluton possess arc-type compositions and yield ⁴⁰Ar/³⁹Ar ages of 9̃0 Ma. Garnet-biotite geothermometry on metamorphic rocks indicates low-P regional metamorphism (550-600C; 3-4 kb) and vertical movement between adjacent fault blocks. Highest temperatures are in the fault block hosting the Bald Knob prospect, suggesting it represents the deepest mineralization exposure in the area and is most proximal to a causative pluton.
    Description
    Thesis (M.S.) University of Alaska Fairbanks, 2002
    Table of Contents
    Ch. 1. Introduction and geologic setting -- ch. 2. Rocks of the Richardson study area -- ch. 3. Regional geophysics -- ch. 4. Petrology of major rock units -- ch. 5. Geochemistry of major rock units -- ch. 6. Geothermometry and geobarometry -- ch. 7. Lode gold mineralization -- ch. 8. Geochronology -- ch. 9. Discussion -- ch. 10. Conclusions -- References.
    Date
    2002-12
    Type
    Thesis
    Collections
    Geosciences

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