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Creator:: Bowman, Kenneth Charles Jr
Abstract:: Heavy minerals can contain potentially economic amounts of metals as both matrix and trace constituents. Such minerals appear as unconsolidated black sands on the continental shelf off southwest Oregon and along the Oregon coast. Two diverse energies are considered in this investigation. Environmental energy of the depositional regimen, Part I;...
Resource Type:: Dissertation
Full Text:: , Professor Emeritus, Colorado School of Mines and Dr. Tj. van Andel, my major professor, have taught me the

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:: H. van Andel for his continuing guidance and patience throughout all phases of my long career as a

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:: approved: Tjeerd H. van Andel A new technique for determining the amount of opal in deep-sea sediments of

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:: OBSERVATIONS Abstract approved: j. H. van Andel The Carnegie Ridge is a linear, aseismic, submarine ridge

Creator:: Oser, Robert Keith
Abstract:: Many sediments, including the fine-grained pelagic deposits, possess polymodal grain size distributions. Resolution of individual modes show them to be related either to compositional fractions or to depositional processes or both, and sometimes permits the tracing of dispersal patterns. The Cahn sedimentation balance provides a means of obtaining continuous cumulative...
Resource Type:: Masters Thesis

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:: WITHIN THE COCOS GAP. PANAMA BASIN Abstract approved Tjeerd H van Andel The Cocos Gap is a deeper

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:: Tjeerd H. van Andel The opening of the South Atlantic between 140 and 90 m. y. B. P. occurred about two

Creator:: Brewster, Nancy Ann
Abstract:: The Antarctic Ocean during the Cenozoic experienced four periods of increased surface productivity: the Middle Eocene; the beginning of the Miocene; the Middle Miocene; and near the Miocene-Pliocene boundary. The fourth increase in productivity began five million years ago and has since progressively increased to the present level of intense...
Resource Type:: Masters Thesis

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:: : TECTONICS OF THE EAST PACIFIC RISE, 5 TO 1 z Os Abstract approved: .H. van Andel and L. D. K The portion

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