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Filtering by: Creator Pisias, Nicklas G. Remove constraint Creator: Pisias, Nicklas G. Contributor advisor sim van Andel, Tjeerd H. Remove constraint Contributor advisor sim: van Andel, Tjeerd H.

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  • Biogenic silica sedimentation in the central equatorial Pacific during the Cenozoic

    Creator:
    Leinen, Margaret, 1946-
    Abstract:
    A new technique for determining the amount of opal in deep-sea sediments of any age is described. Using a normative calculation, a portion of the analytical silica concentration of sediments is subtracted as non-biogenic in proportion to the concentration of aluminum in the sample. The ratio of SiO₂:Al₂O₃ used to...
    Resource Type:
    Masters Thesis
    Full Text:
    frustrations over this work. Dr. G. Ross Heath has contributed above and beyond the call of duty as a

  • Late Quaternary radiolarian paleo-oceanography of the Panama Basin, eastern equatorial Pacific

    Creator:
    Dinkelman, Menno Gustaaf
    Abstract:
    A total of 57 core top samples from the Panama Basin were used in a quantitative study of complete radiolarian thanatocoenoses to determine whether surface oceanographic conditions are reflected in the microplankton faunas deposited onto and buried in the sea floor. Information obtained from this study was used to resolve...
    Resource Type:
    Dissertation
    Full Text:
    special note of thanks is due Nicklas G. Pi.sias for his unselfish assistance in helping me to understand

  • Sedimentation within the Cocos Gap, Panama Basin

    Creator:
    Dowding, Lynn Gretton
    Abstract:
    The Cocos Gap is a deeper portion, or saddle, of the Cocos Ridge and forms part of the western boundary of the Panama Basing It is probably typical of saddles within most submarine ridges, In order to determine the mechanisms controlling sediment dispersal, the nature and sources of the sediments...
    Resource Type:
    Masters Thesis
    Full Text:
    the Cocos Gap, Panama Basin by Lynn G Dowding A THESIS submitted to Oregon State University in

  • Tectonic evolution of the Walvis Ridge and West African margin, South Atlantic Ocean

    Creator:
    Baumgartner, Timothy Robert
    Abstract:
    The opening of the South Atlantic between 140 and 90 m. y. B. P. occurred about two poles of rotation. The initial pole of rotation was maintained until Africa and South America were completely separated. The subsequent removal of restraints imposed by the pre-existing structure of Africa and South America...
    Resource Type:
    Masters Thesis
    Full Text:
    Gemperle and Nick Pisias provided me with advice and assistance in the computer processing of magnetic

  • The Carnegie Ridge near 86⁰ W. : structure, sedimentation and near bottom observations

    Creator:
    Malfait, Bruce Terry
    Abstract:
    The Carnegie Ridge is a linear, aseismic, submarine ridge lying between the Galapagos Islands and the coast of South America. A 2300 meter deep saddle near 86°W. longitude divides the ridge into western and eastern segments. Surface ship, near bottom, and grain size studies from the saddle have been used...
    Resource Type:
    Dissertation
    Full Text:
    advice. Nick Pisias, Milo Clausen and Ken Keeling provided assistance with the computer throughout this

  • Tectonics of the East Pacific Rise, 5⁰ to 12⁰S

    Creator:
    Rea, David K.
    Abstract:
    The portion of the East Pacific Rise (EPR) between 5° and 12°S can be subdivided into three areas by fracture zones that offset the rise axis at about 6.5°S and 9°S. In all three regions, the spreading axis of the EPR is defined by a topographic block 300 to 350...
    Resource Type:
    Dissertation
    Full Text:
    general. Nick Pisias provided invaluable assistance with the spectral analysis of the topography and