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Staudigel, Hubert; Bryan, Wilfred B (1981): Mineral an chemical composition of basalts from DSDP Sites 417 and 418, West Atlantic Ocean [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.667437, Supplement to: Staudigel, H; Bryan, WB (1981): Contrasted glass-whole rock compositions and phenocryst re-distribution, IPOD Sites 417 and 418. Contributions to Mineralogy and Petrology, 78(3), 255-262, https://doi.org/10.1007/BF00398920

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Abstract:
Major element composition ranges of closely associated basalt glass-whole rock pairs from individual small cooling units approach the total known range of basalt glass and whole rock compositions at IPOD sites 417 and 418. The whole rock samples fall into two groups: one is depleted in MgO and distinctly enriched in plagioclase but has lost some olivine and/or pyroxene relative to its corresponding glass; and the other is enriched in MgO and in phenocrysts of olivine and pyroxene as well as plagioclase compared to its corresponding glass. By analogy with observed phenocryst distributions in lava pillows, tubes, and dikes, and with some theoretical studies, we infer that bulk rock compositions are strongly affected by phenocryst redistribution due to gravity settling, flotation, and dynamic sorting after eruption, although specific models are not well constrained by the one-dimensional geometry of drill core. Compositional trends or groupings in whole rock data resulting from such late-stage processes should not be confused with more fundamental compositional effects produced in deep chambers or during partial melting.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 25.047725 * Median Longitude: -68.055567 * South-bound Latitude: 25.034850 * West-bound Longitude: -68.057400 * North-bound Latitude: 25.111500 * East-bound Longitude: -68.046800
Date/Time Start: 1976-12-02T00:00:00 * Date/Time End: 1977-03-15T00:00:00
Event(s):
51-417D * Latitude: 25.111500 * Longitude: -68.046800 * Date/Time: 1976-12-02T00:00:00 * Elevation: -5482.0 m * Penetration: 532.5 m * Recovery: 202.6 m * Location: North Atlantic/CONT RISE * Campaign: Leg51 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 43 cores; 508.6 m cored; 30.4 m drilled; 39.8 % recovery
52-418A * Latitude: 25.035000 * Longitude: -68.057300 * Date/Time: 1977-02-10T00:00:00 * Elevation: -5511.0 m * Penetration: 570.5 m * Recovery: 205.5 m * Location: North Atlantic/CONT RISE * Campaign: Leg52 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 48 cores; 374 m cored; 0 m drilled; 54.9 % recovery
53-418_Site * Latitude: 25.034850 * Longitude: -68.057400 * Date/Time: 1977-02-12T00:00:00 * Elevation: -5514.0 m * Penetration: 11.976 m * Recovery: 4.063 m * Campaign: Leg53 * Basis: Glomar Challenger * Method/Device: Composite Core (COMPCORE) * Comment: 73 cores; 626.7 m cored; 9.3 m drilled; 64.8% recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
12 datasets

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Datasets listed in this publication series

  1. Staudigel, H; Bryan, WB (1981): (Table 4) Mineral composition of basalt phenocrysts, microphenocrysts, and matrix from DSDP Hole 51-417D. https://doi.org/10.1594/PANGAEA.667419
  2. Staudigel, H; Bryan, WB (1981): (Table 5) Composition of whole rocks, magnesium oxide enriched trends from DSDP Hole 51-417D. https://doi.org/10.1594/PANGAEA.667422
  3. Staudigel, H; Bryan, WB (1981): (Table 2c) Major element composition of clinopyroxene from DSDP Hole 52-418A. https://doi.org/10.1594/PANGAEA.667416
  4. Staudigel, H; Bryan, WB (1981): (Table 4) Mineral composition of magnesium oxide depleted basalt phenocrysts, microphenocrysts, and matrix from DSDP Hole 52-418A. https://doi.org/10.1594/PANGAEA.667420
  5. Staudigel, H; Bryan, WB (1981): (Table 2b) Major element composition of olivine phenocrysts and microphenocrysts from DSDP Hole 52-418A. https://doi.org/10.1594/PANGAEA.667414
  6. Staudigel, H; Bryan, WB (1981): (Table 2a) Major element composition of plagioclase phenocrysts from DSDP Hole 52-418A. https://doi.org/10.1594/PANGAEA.667412
  7. Staudigel, H; Bryan, WB (1981): (Table 5) Composition of whole rocks, magnesium oxide enriched trends from DSDP Hole 52-418A. https://doi.org/10.1594/PANGAEA.667423
  8. Staudigel, H; Bryan, WB (1981): (Table 4) Mineral composition of basalt phenocrysts, microphenocrysts, and matrix from DSDP Site 53-418_Site. https://doi.org/10.1594/PANGAEA.667421
  9. Staudigel, H; Bryan, WB (1981): (Table 2a) Major element composition of plagioclase phenocrysts from DSDP Site 53-418_Site. https://doi.org/10.1594/PANGAEA.667413
  10. Staudigel, H; Bryan, WB (1981): (Table 2c) Major element composition of clinopyroxene from DSDP Hole 53-418A. https://doi.org/10.1594/PANGAEA.667417
  11. Staudigel, H; Bryan, WB (1981): (Table 2b) Major element composition of olivine phenocrysts and microphenocrysts from DSDP Hole 53-418A. https://doi.org/10.1594/PANGAEA.667415
  12. Staudigel, H; Bryan, WB (1981): (Table 5) Composition of whole rocks from DSDP Hole 53-418A. https://doi.org/10.1594/PANGAEA.667424