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    Platinum group element enriched hydrothermal magnetite of the Union Bay Alaska-type ultramafic intrusion, Southeast Alaska

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    Van_Treeck_C_2009.pdf
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    Description:
    Thesis
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    Plate 1 Bedrock Geology of the ...
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    Plate 1
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    Author
    Van Treeck, Christopher Jared
    Keyword
    Geochemistry
    Geology
    Magnetite
    Platinum group
    Ultrabasic rocks
    Geological intrusions
    Metadata
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    URI
    http://hdl.handle.net/11122/12795
    Abstract
    "The Union Bay Alaskan-type Complex represents a completely different type of platinum group element (PGE) concentration from the classic Alaskan-type Complex PGE mineralization model, with PGEs localized in vein/veinlet magnetite, commonly within the olivine + pyroxene portions of the body. PGE concentrations of 18 g/t occur in magnetite veins and pods which cross magmatic layering and have an irregular morphology in both outcrop and thin section. Fe-Ti oxide geothermometry indicates that this mineralization formed at temperatures between 675-475°C. A variation in the amount of ilmenite and Mg-Al spinel exsolution in magnetite correlates with temperature estimates, lower temperature magnetite has less exsolution. Magnetite veins with a formation temperature of less than 600°C are surrounded by an alteration envelope of hydrous silicates that vary with temperature and contain appreciable amounts of Cl. Interaction of a PGE-Fe-Cl rich fluid with clinopyroxene and olivine increased the fluids pH and decreased PGE and Fe solubility depositing a PGE enriched magnetite within the wehrlite and clinopyroxenite of the Union Bay Alaskan-type complex. Potentially this fluid remobilized the PGE from disseminated euhedral magnetite of the peripheral units to form PGE enriched magnetite veins in the near-central portion of the complex"--Leaf iii
    Description
    Thesis (M.S.) University of Alaska Fairbanks, 2009
    Table of Contents
    1. Introduction, regional geology, and methodology -- 2. Geology of the Union Bay AT -- 3. Geology and geochemistry of the Union Bay PGE prospects -- 4. Petrographic observations -- 5. Mineral analyses -- 6. Discussion, summary, and conclusions -- Future work -- References cited.
    Date
    2009-08
    Type
    Thesis
    Collections
    Geosciences

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