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  • 115-706C; 115-707C; 115-713A; 115-715A; DRILL; Drilling/drill rig; Indian Ocean; Joides Resolution; Lakshadweep Sea; Leg115; Ocean Drilling Program; ODP; South Indian Ridge, South Indian Ocean  (2)
  • PANGAEA  (2)
  • American Association for the Advancement of Science
  • 1990-1994  (2)
  • 1955-1959
  • 1990  (2)
Collection
Keywords
Publisher
  • PANGAEA  (2)
  • American Association for the Advancement of Science
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  • 1990-1994  (2)
  • 1955-1959
Year
  • 1990  (2)
  • 1
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    Unknown
    Petrography, chemistry and magnetic properties of ODP Leg 115 basalts (1990)
    PANGAEA
    In:  Supplement to: Hargraves, Robert B (1990): Magnetic properties, iron-titanium oxides, and petrology of four Leg 115 basalts. In: Duncan, RA; Backmann, J; Peterson, LC; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 115, 103-110, https://doi.org/10.2973/odp.proc.sr.115.127.1990
    Details
    Publication Date: 2024-01-09
    Description: A detailed study of the Fe-Ti oxides in four basalt samples-one from each of the four holes drilled into basement on Ocean Drilling Program Leg 115 (Sites 706, 707, 713, and 715) has been performed. Ilmenite is present only in samples from Sites 706 and 715. In the sample from Site 715, Ti-magnetite intergrowths are characteristic of subaerial (?) high-temperature oxy-exsolution; Ti-magnetite in the other three samples has experienced pervasive low-temperature oxidation to Ti-maghemite, as evidenced by the double-humped, irreversible, saturation magnetization vs. temperature (Js/T) curves. The bulk susceptibility of these samples, which are similar in terms of major element chemistry, varies by a factor of ~20 and correlates semiquantitatively with the modal abundance of Fe-Ti spinel, as determined by image analysis with an electron microprobe. The variation in Fe-Ti oxide abundance correlates with average grain size: fine-grained samples contain less Fe-Ti oxide. This prompts the speculation that the crystallization rate may also influence Fe-Ti oxide abundance.
    Keywords: 115-706C; 115-707C; 115-713A; 115-715A; DRILL; Drilling/drill rig; Indian Ocean; Joides Resolution; Lakshadweep Sea; Leg115; Ocean Drilling Program; ODP; South Indian Ridge, South Indian Ocean
    Type: Dataset
    Format: application/zip, 3 datasets
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 2
    facet.materialart.
    Unknown
    Geochemistry of ODP Leg 115 basalts (1990)
    PANGAEA
    In:  Supplement to: Tatsumi, Yoshiyuki; Nohda, Susumu (1990): Geochemical stratification in the upper mantle: evidence from Leg 115 basalts in the Indian Ocean. In: Duncan, RA; Backmann, J; Peterson, LC; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 115, 63-69, https://doi.org/10.2973/odp.proc.sr.115.136.1990
    Details
    Publication Date: 2024-01-09
    Description: Melting-phase relations at high pressures and Sr-Nd isotopic compositions are reported for basalts collected from the western Indian Ocean during Ocean Drilling Program Leg 115. Based on the concentrations of high-field-strength elements, we have subdivided the basalts into eight groups. A tholeiitic primary magma estimated using an olivine maximum fractionation model is representative of depleted lavas. This melt is in equilibrium with lherzolite minerals at 1.3 GPa and 1330°C under dry conditions. Also, an alkaline primary magma, representative of enriched lavas, is not saturated with orthopyroxene under dry conditions, but it is saturated with lherzolite minerals under CO2-saturated conditions at 1.7 GPa and 1350°C. These results imply that the tholeiitic magmas were segregated from mantle diapirs at shallower levels than the alkaline magmas. The highest 143Nd/144Nd value is obtained for the most depleted tholeiitic basalts, and the lowest value corresponds to the enriched alkaline basalt. The Sr isotopes of the basalts range from 0.70378 to 0.70449 and are inversely correlated with the Nd isotopic values. The present experimental and geochemical data suggest that depleted mantle material is underlain by the enriched material in the upper mantle beneath the region.
    Keywords: 115-706C; 115-707C; 115-713A; 115-715A; DRILL; Drilling/drill rig; Indian Ocean; Joides Resolution; Lakshadweep Sea; Leg115; Ocean Drilling Program; ODP; South Indian Ridge, South Indian Ocean
    Type: Dataset
    Format: application/zip, 2 datasets
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    DATA PANGAEA
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