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    Geothermometry and cathodoluminescence of quartz reveal crystallization histories of Katmai magmas

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    Author
    Payne, Allison L.
    Keyword
    Magmatism
    Mount Katmai
    Magmas
    Cathodoluminescence
    Quartz
    Volcanism
    Metadata
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    URI
    http://hdl.handle.net/11122/12749
    Abstract
    "This study combines electron microprobe analysis of titanium and aluminum in quartz, cathodoluminescence imagery, and titanium-in-quartz geothermometry to constrain the growth histories of quartz grains from three magmatic rock suites of Katmai, Alaska: (1) high-silica rhyolite from the 1912 Novarupta lava dome; (2) the Mageik rhyolite sills, suggested as an analog for Novarupta's feeder; and (3) the Pinnacle Porphyry granodiorite, which has mingled field relations with the Mageik sills. Oscillatory zoning and constant titanium concentrations across Novarupta quartz phenocrysts suggest continuous growth at temperatures of ~800-850°C. Thin, aluminum-rich, high-cathodoluminescence intensity rims may represent rapid growth during magmatic ascent or dome emplacement. Euhedral matrix quartz of the Mageik sills has cores enriched in both titanium and aluminum, yielding minimum temperatures of ~900°C, and possibly representing rapid growth. Titanium-poor rims likely represent continued growth to subsolidus temperatures after emplacement of the sills. Quartz in the Pinnacle Porphyry show early crystallization at minimum temperatures of ~820-870°C, followed by partial resorption and continued growth at ~800-815°C. Magma mixing events, as evidenced by mafic enclaves, may be responsible for the dissolution, while ascent and uninterrupted crystallization to solidus may be responsible for resumed growth at lower temperatures"--Leaf iii
    Description
    Thesis (M.S.) University of Alaska Fairbanks, 2010
    Table of Contents
    I. Quartz -- Quartz crystallization -- Trace elements in quartz -- Titanium and aluminum in quartz -- Titanium-in-quartz geothermometry -- Constraining TiO₂ activity -- Interpreting titanium-in-quartz geothermometry -- TitaniQ applied: an example from the Bishop Tuff -- Effect of pressure on Ti solubility in quartz -- II. Cathodoluminescence -- Background -- History of cathodoluminescence -- Causes of cathodoluminescence -- Cathodoluminescence instrumentation -- Optical CL microscope (cold cathode) -- EPMA/SEM-CL (hot cathode) -- The cathodoluminescence of quartz -- Quartz CL spectra -- Quartz CL intensity -- CL zoning in quartz -- III. Regional setting and rock units -- Regional setting -- Rock unit 1: Novarupta lava dome -- Rock unit 2: The west Mageik Lake sill complex -- Rock unit 3: The pinnacle porphyry granodiorite stock -- IV. Materials and methods -- Sample preparation -- Cathodoluminescence imaging -- EPMA analysis -- EPMA analysis of trace elements in quartz -- EPMA glass analysis of Novarupta samples -- V. Results -- Summary of results: CL imagery -- Summary of results: trace element data -- Summary of results: geothermometry -- Novarupta CL imagery and trace element data -- Novarupta geothermometry -- Mageik sill CL imagery and trace element data -- Mageik sill geothermometry -- Pinnacle porphyry CL imagery and trace element data -- Pinnacle porphyry geothermometry -- Error analysis -- VI. Discussion -- Novarupta -- Mageik sills -- Pinnacle porphyry -- Petrogenesis of Katmai's HSR -- The mageik sills: borne of the Pinnacle Porphyry mush? -- Katmai HSR magmas: borne of deep crystal mush? -- Growing quartz in Katmai rhyolites -- Quartz crystallization in the Aleutian arc -- Conclusions -- References.
    Date
    2010-05
    Type
    Thesis
    Collections
    Geosciences

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