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Fisk, Martin R; Howard, Katherine J (1990): Primary mineralogy of ODP Leg 115 basalts [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.755762, Supplement to: Fisk, MR; Howard, KJ (1990): Primary mineralogy of 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, 23-42, https://doi.org/10.2973/odp.proc.sr.115.122.1990

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Abstract:
Basement rocks were recovered at four sites on Leg 115 along the Reunion hotspot track in the western Indian Ocean. Plate tectonic reconstructions indicate that the drilled structures formed in three different volcanic environments. Sites 706 and 713 from the eastern side of the Saya de Malha Bank and the northern end of the Chagos Bank, respectively, are on a large volcanic platform analogous to Iceland on the Mid-Atlantic Ridge. Lavas at Site 707 on the northwestern side of the Saya de Malha Bank erupted during the early stages of rifting of the Seychelles from India. Basalts from Site 715 were erupted onto an isolated oceanic island that was distant from ocean ridges and continents much as Reunion Island is today.
Many of the rocks were examined in thin section and found to be primarily augite-plagioclase basalts with minor olivine and rare opaque oxides. Site 715 is unusual in that it contains a variety of basalts including olivine-rich and aphyric Fe-Ti basalts. At each of the four sites the rocks were grouped into chemical types (units) on the basis of ship- board bulk-rock analyses and at least one thin section from each chemical unit was analyzed by electron microprobe. The plagioclase and augite chemistry reflects the bulk-rock chemistry and, in general, these minerals were in equilibrium with their host magmas at the time the basalts were quenched. Olivine was rarely preserved, but where it is still present it also appears to have crystallized in equilibrium with the host magma. At three of the drill sites plagioclase phenocrysts or megacrysts that crystallized from a primitive magma are also present. The one site (715) that does not contain these primitive plagioclase phenocrysts is also the site that appears to have been influenced the least by ocean- ridge or Deccan-type magmas. Site 715, furthermore, has a mineralogy that is dominated by olivine as compared with the plagioclase-rich lavas of the other sites.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -5.052964 * Median Longitude: 67.480065 * South-bound Latitude: -13.114000 * West-bound Longitude: 59.016800 * North-bound Latitude: 5.081500 * East-bound Longitude: 73.831300
Date/Time Start: 1987-05-22T23:15:00 * Date/Time End: 1987-06-28T07:45:00
Event(s):
115-706A * Latitude: -13.114000 * Longitude: 61.371000 * Date/Time Start: 1987-05-22T23:15:00 * Date/Time End: 1987-05-23T08:00:00 * Elevation: -2517.0 m * Penetration: 47.5 m * Recovery: 39.28 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg115 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 6 cores; 47.5 m cored; 0 m drilled; 82.7 % recovery
115-706B * Latitude: -13.114000 * Longitude: 61.371000 * Date/Time Start: 1987-05-23T08:00:00 * Date/Time End: 1987-05-24T03:30:00 * Elevation: -2518.0 m * Penetration: 43.7 m * Recovery: 29.44 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg115 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 7 cores; 43.7 m cored; 0 m drilled; 67.4 % recovery
115-706C * Latitude: -13.114000 * Longitude: 61.371000 * Date/Time Start: 1987-05-24T03:30:00 * Date/Time End: 1987-05-26T00:45:00 * Elevation: -2518.0 m * Penetration: 121.7 m * Recovery: 19.72 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg115 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 8 cores; 77.4 m cored; 0 m drilled; 25.5 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
15 datasets

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Datasets listed in this publication series

  1. Fisk, MR; Howard, KJ (1990): (Table 2) Chemistry of clinopyroxenes of ODP Site 115-706. https://doi.org/10.1594/PANGAEA.755748
  2. Fisk, MR; Howard, KJ (1990): (Table 3) Chemistry of glass of ODP Site 115-706. https://doi.org/10.1594/PANGAEA.755749
  3. Fisk, MR; Howard, KJ (1990): (Table 1) Chemistry of plagioclase phenocrysts of ODP Site 115-706. https://doi.org/10.1594/PANGAEA.755747
  4. Fisk, MR; Howard, KJ (1990): (Table 4) Chemistry of olivine microphenocrysts of ODP Hole 115-706C. https://doi.org/10.1594/PANGAEA.755750
  5. Fisk, MR; Howard, KJ (1990): (Table 7) Chemistry of clinopyroxene of ODP Hole 115-707C. https://doi.org/10.1594/PANGAEA.755753
  6. Fisk, MR; Howard, KJ (1990): (Table 6) Chemistry of plagioclase phenocrysts of ODP Hole 115-707C. https://doi.org/10.1594/PANGAEA.755752
  7. Fisk, MR; Howard, KJ (1990): (Table 9) Chemistry of clinopyroxene of ODP Hole 115-713A. https://doi.org/10.1594/PANGAEA.755755
  8. Fisk, MR; Howard, KJ (1990): (Table 10) Chemistry of glass of ODP Hole 115-713A. https://doi.org/10.1594/PANGAEA.755756
  9. Fisk, MR; Howard, KJ (1990): (Table 11) Chemistry of olivine phenocrysts of ODP Hole 115-713A. https://doi.org/10.1594/PANGAEA.755757
  10. Fisk, MR; Howard, KJ (1990): (Table 8) Chemistry of plagioclase microphenocryst of ODP Hole 115-713A. https://doi.org/10.1594/PANGAEA.755754
  11. Fisk, MR; Howard, KJ (1990): (Table 13) Chemistry of clinopyroxene of ODP Hole 115-715A. https://doi.org/10.1594/PANGAEA.755759
  12. Fisk, MR; Howard, KJ (1990): (Table 14) Chemistry of olivine of ODP Hole 115-715A. https://doi.org/10.1594/PANGAEA.755760
  13. Fisk, MR; Howard, KJ (1990): (Table 12) Chemistry of plagioclase phenocrysts of ODP Hole 115-715A. https://doi.org/10.1594/PANGAEA.755758
  14. Fisk, MR; Howard, KJ (1990): (Table 5) Chemistry of opaque minerals of ODP Leg 115 holes. https://doi.org/10.1594/PANGAEA.755751
  15. Fisk, MR; Howard, KJ (1990): (Appendix) Thin sections probed on samples from ODP Leg 115. https://doi.org/10.1594/PANGAEA.755761