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    Kinetic processes of mantle minerals

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    Koga_thesis.pdf (4.290Mb)
    Date
    1999-09
    Author
    Koga, Kenneth T.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/4106
    DOI
    10.1575/1912/4106
    Keyword
     Pyroxene; Peridotite 
    Abstract
    This dissertation discusses the experimental results designed to constrain the processes of MORB generation. The main focus of this study is to investigate the location and the related processes of the transformation boundary from spinel to garnet peridotite facies at subsolidus conditions, because the presence of garnet in melting residues has significant influence to the conclusion drawn from geochemical/geophysical observations. Using an approach that monitors the rate of reaction progresses, the experimental results confirmed the presence of a region that garnet and spinel coexist in peridotite compositions. The trace element distribution among the product phases (opx and cpx) subsequent to the garnet breakdown reaction is in disequilibrium, due to the differences of diffusivity between major and trace elements. The presence of disequilibrium distribution in nature may be used to infer time scales of geodynamic processes. Diffusion coefficients of A1 in diopside are experimentally determined, and used for modeling the equilibration of major elements in pyroxene during MORB genesis. In summary, this dissertation contributes two major inferences: the location of the transformation boundaries of the gamet-spinel peridotite; the presence of disequilibrium trace elements distribution with equilibrium major elements distribution in mantle pyroxenes.
    Description
    Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution September 1999
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    • WHOI Theses
    • Geology and Geophysics (G&G)
    Suggested Citation
    Thesis: Koga, Kenneth T., "Kinetic processes of mantle minerals", 1999-09, DOI:10.1575/1912/4106, https://hdl.handle.net/1912/4106
     

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