University of Maryland LibrariesDigital Repository at the University of Maryland
    • Войти
    Просмотр элемента 
    •   Главная
    • Theses and Dissertations from UMD
    • UMD Theses and Dissertations
    • Просмотр элемента
    •   Главная
    • Theses and Dissertations from UMD
    • UMD Theses and Dissertations
    • Просмотр элемента
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Isotopic systematics of ultramafic and mafic rocks of the Taitao ophiolite, southern Chile

    Thumbnail
    Открыть
    umi-umd-4177.pdf (2.588Mb)
    No. of downloads: 58731

    Дата
    2007-03-14
    Автор
    Schulte, Ruth Frost
    Advisor
    Walker, Richard J
    Metadata
    Показать полную информацию
    Аннотации
    A variety of ultramafic and mafic rocks from a well-mapped sampling of the ~6 Ma Taitao Ophiolite, Chile, have been examined. Calculated initial 187Os/188Os ratios of the peridotitic rocks range from 0.1168 to 0.1282. Similar ranges of Os isotopic compositions have been reported for abyssal peridotites, peridotites, and chromites from other ophiolites. A correlation between Mg # of primary olivine and Os isotopic compositions of whole rock peridotites suggests that the isotopic variability is due to variable extents of partial melting at ~1.5 Ga. This conclusion is also supported by a linear correlation between 187Re/188Os and 187Os/188Os. The ancient melting event requires that this km-scale block of the mantle remained isolated and unmixed within the convecting upper mantle for a period of ~1.5 Ga. The results are comparable to global observations of Os isotopic compositions in mid-ocean ridge basalts versus abyssal peridotites, but the geologic relations here are well-defined.
    URI
    http://hdl.handle.net/1903/6705
    Collections
    • Geology Theses and Dissertations
    • UMD Theses and Dissertations

    DRUM is brought to you by the University of Maryland Libraries
    University of Maryland, College Park, MD 20742-7011 (301)314-1328.
    Please send us your comments.
    Web Accessibility
     

     

    Просмотр

    Весь DSpaceСообщества и коллекцииДата публикацииАвторыНазванияТематикаЭта коллекцияДата публикацииАвторыНазванияТематика

    Моя учетная запись

    ВойтиРегистрация
    Pages
    About DRUMAbout Download Statistics

    DRUM is brought to you by the University of Maryland Libraries
    University of Maryland, College Park, MD 20742-7011 (301)314-1328.
    Please send us your comments.
    Web Accessibility