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Rowbotham, G; Floyd, Peter A (1992): Mineral chemistry of primary and secondary phases in basaltic rocks [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.779095, Supplement to: Rowbotham, G; Floyd, PA (1992): Mineral chemistry of primary and secondary phases in basaltic rocks, Leg 129. In: Larson, RL; Lancelot, Y; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 129, 305-434, https://doi.org/10.2973/odp.proc.sr.129.127.1992

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Abstract:
Primary magmatic phases (spinel, olivine, plagioclase, clinopyroxene, amphibole, and biotite) and secondary phyllosilicates (smectite, chlorite-smectite, and celadonite) were analyzed by electron microprobe in alkalic and tholeiitic dolerites and basalts from Ocean Drilling Program Sites 800, 801, and 802. Aphyric alkalic dolerite sills (Hole 800A) and basalt flows (Holes 801B and 801C) share common mineralogical features: matrix feldspars are strongly zoned from labradorite cores to discrete sodic rims of alkali feldspar with a high Or component, which overlaps that of quench microlites in glassy mesostasis; little fractionated clinopyroxenes are Ti-rich diopsides and augites (with marked aegirine-augite rims at Site 801); rare, brown, Fe**3+-rich amphibole is winchite; and late biotites exhibit variable Ti contents. Alkalic rims to feldspars probably developed at the same time as quenched mesostasis feldspars and late-stage magmatic biotite, and represent the buildup of K-rich hydrous fluids during crystallization. Phenocryst phases in primitive mid-ocean ridge tholeiites from Hole 801C (Mg numbers about 70) have extreme compositions with chrome spinel (Cr/Cr + Al ratios about 0.2-0.4), Ni-rich olivine (Fo90), and highly calcic plagioclase (An90). Later glomerophyric clumps of plagioclase (An75-80) and clinopyroxene (diopside-augite) are strongly zoned and probably reflect rapidly changing melt conditions during upward transport, prior to seafloor quenching. In contrast, phenocryst phases (olivine, plagioclase, and clinopyroxene) in the Hole 802A tholeiites show limited variation and do not have such primitive compositions, reflecting the uniform and different chemical composition of all the bulk rocks.
Replacive phyllosilicates in both alkalic and tholeiitic basalts include various colored smectites (Fe-, Mg-, and Al-saponites), chlorite-smectite and celadonite. Smectite compositions typically reflect the replaced host composition; glass is replaced by brown Fe-saponites (variable Fe/Mg ratios) and olivine by greenish Mg-saponites (or Al-rich chlorite-smectite).
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 17.403600 * Median Longitude: 154.709387 * South-bound Latitude: 12.096300 * West-bound Longitude: 152.322900 * North-bound Latitude: 21.923000 * East-bound Longitude: 156.359800
Date/Time Start: 1989-11-26T02:45:00 * Date/Time End: 1990-01-16T07:15:00
Event(s):
129-800A * Latitude: 21.923000 * Longitude: 152.322900 * Date/Time Start: 1989-11-26T02:45:00 * Date/Time End: 1989-12-05T20:27:00 * Elevation: -5697.0 m * Penetration: 544.4 m * Recovery: 150.73 m * Location: North Pacific Ocean * Campaign: Leg129 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 61 core; 544.4 m cored; 0 m drilled; 27.7 % recovery
129-801B * Latitude: 18.642000 * Longitude: 156.359700 * Date/Time Start: 1989-12-09T17:00:00 * Date/Time End: 1989-12-17T01:15:00 * Elevation: -5685.0 m * Penetration: 511.2 m * Recovery: 59.17 m * Location: North Pacific Ocean * Campaign: Leg129 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 44 cores; 317.2 m cored; 0 m drilled; 18.7 % recovery
129-801C * Latitude: 18.642300 * Longitude: 156.359800 * Date/Time Start: 1990-01-06T11:48:00 * Date/Time End: 1990-01-16T07:15:00 * Elevation: -5685.0 m * Penetration: 594.3 m * Recovery: 60.6 m * Location: North Pacific Ocean * Campaign: Leg129 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 12 cores; 100.6 m cored; 0 m drilled; 60.2 % 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. Rowbotham, G; Floyd, PA (1992): (Table 4) Alkali pyroxene analyses from alkalic basalts from ODP Site 129-801. https://doi.org/10.1594/PANGAEA.779066
  2. Rowbotham, G; Floyd, PA (1992): (Table 11) Spinel analyses from tholeiitic basalts from ODP Site 129-801. https://doi.org/10.1594/PANGAEA.779088
  3. Rowbotham, G; Floyd, PA (1992): (Table 15) Analyses of carbonates from a traverse across the infill of a fracture in ODP Hole 129-801C. https://doi.org/10.1594/PANGAEA.779094
  4. Rowbotham, G; Floyd, PA (1992): (Table 10) Glass analyses from tholeiitic basalts from ODP Hole 129-802A. https://doi.org/10.1594/PANGAEA.779086
  5. Rowbotham, G; Floyd, PA (1992): (Table 5) Amphibole analyses from alkalic dolerites from ODP Leg 129 holes. https://doi.org/10.1594/PANGAEA.779067
  6. Rowbotham, G; Floyd, PA (1992): (Table 6) Biotite analyses from alkalic dolerites and basalts from ODP Leg 129 holes. https://doi.org/10.1594/PANGAEA.779070
  7. Rowbotham, G; Floyd, PA (1992): (Table 14) Celadonite analyses from dolerites and basalts from ODP Leg 129 holes. https://doi.org/10.1594/PANGAEA.779093
  8. Rowbotham, G; Floyd, PA (1992): (Table 3) Clinopyroxene analyses from alkalic dolerites and basalts from ODP Leg 129 holes. https://doi.org/10.1594/PANGAEA.779064
  9. Rowbotham, G; Floyd, PA (1992): (Table 8) Clinopyroxene analyses from tholeiitic basalts from ODP Leg 129 holes. https://doi.org/10.1594/PANGAEA.779084
  10. Rowbotham, G; Floyd, PA (1992): (Table 2) Feldspar analyses from alkalic dolerites and basalts from ODP Leg 129 holes. https://doi.org/10.1594/PANGAEA.779063
  11. Rowbotham, G; Floyd, PA (1992): (Table 1) Mineral phases in selected samples of dolerites and basalts from ODP Leg 129 holes. https://doi.org/10.1594/PANGAEA.779061
  12. Rowbotham, G; Floyd, PA (1992): (Table 9) Olivine analyses from tholeiitic basalts from ODP Leg 129 holes. https://doi.org/10.1594/PANGAEA.779085
  13. Rowbotham, G; Floyd, PA (1992): (Table 7) Plagioclase analyses from tholeiitic basalts from ODP Leg 129 holes. https://doi.org/10.1594/PANGAEA.779076
  14. Rowbotham, G; Floyd, PA (1992): (Table 12) Smectite analyses from alcalic dolerites and basalts from ODP Leg 129 holes. https://doi.org/10.1594/PANGAEA.779091
  15. Rowbotham, G; Floyd, PA (1992): (Table 13) Smectite analyses from tholeiitic basalts from ODP Leg 129 holes. https://doi.org/10.1594/PANGAEA.779092