Now showing items 1-6 of 6

  • Basalt petrogenesis beneath slow- and ultraslow-spreading Arctic mid-ocean ridges 

    Elkins, Lynne J. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2009-02)
    To explore the ability of melting mafic lithologies to produce alkaline ocean-island basalts (OIB), an experimental study was carried out measuring clinopyroxene (Cpx)- melt and garnet (Gt)-melt partition coefficients ...
  • Global isotopic signatures of oceanic island basalts 

    Oschmann, Lynn A. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1991-08)
    Sr, Nd and Pb isotopic analyses of 477 samples representing 30 islands or island groups, 3 seamounts or seamount chains, 2 oceanic ridges and 1 oceanic plateau [for a total of 36 geographic features] are compiled to form ...
  • Helium isotope geochemistry of oceanic volcanic rocks : implications for mantle heterogeneity and degassing 

    Kurz, Mark D. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1982-06)
    The concentrations and isotopic compositions of helium have been measured in a number of mantle derived oceanic basalts. The goal of this research is to use the helium isotopic systematics to constrain the nature and ...
  • The hydrothermal alteration of oceanic basalts by seawater 

    Humphris, Susan E. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1976-10)
    Considerable geological and geophysical evidence now exists to support the hypothesis that seawater circulates through freshly intruded basalt at the mid-ocean ridges. As a consequence of this process, reactions between ...
  • The isotope geochemistry of abyssal peridotites and related rocks 

    Snow, Jonathan E. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1993-06)
    This dissertation studies several aspects of the formation of the Earth's oceanic mantle and crust, using a variety of geologic techniques, principally major elements, radiogenic isotopes and trace elements, but including ...
  • The origin of the ninetyeast ridge and the northward motion of India, based on DSDP paleolatitudes 

    Peirce, John Wentworth (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1977-01)
    This thes is is a collection of papers on the paleomagnetics of samples from several Deep Sea Drilling Project (DSDP) sites in the Indian Ocean. These papers present the basic paleomagnetic data, discuss the statistical ...