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Griffin, Brendon J; Neuser, R D; Schmincke, Hans-Ulrich (1983): Geochemistry of selected minerals at DSDP Leg 65 Holes [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.818069, Supplement to: Griffin, BJ et al. (1983): Lithology, petrography, and mineralogy of basalts from DSDP Sites 482, 483, 484, and 485 at the mouth of the Gulf of California. In: Lewis, BTR; Robinson, P; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 65, 527-548, https://doi.org/10.2973/dsdp.proc.65.124.1983

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Abstract:
The majority of the basalts drilled on Leg 65 in the Gulf of California are aphyric to sparsely phyric massive flows ranging in average thickness between 5 meters in the upper part of the sections in Holes 483 and 483B, where they are interlayered with sediment, and 14 meters in Hole 485A, where interlayered sediments constitute more than half of the section. Massive flows interlayered with pillows are generally less than 4 meters thick. The pillow lavas recovered are more phyric (up to 15 modal%) and contain two to three generations of plagioclase and olivine ± clinopyroxene. Plagioclase generally exceeds 60% of any given phenocryst assemblage. Resorbed olivine, clinopyroxene, and plagioclase megacrysts may reflect a high-pressure stage, the phenocrysts crystallizing in the main magma chamber and the skeletal microphenocrysts in dikes. Precise measurements of length/width ratios of different phenocryst types and compositions show low aspect ratios and large crystal volumes for early crystals and high ratios and low volumes for late crystals grown under strong undercooling conditions. The minerals examined show wide ranges in composition: in particular, plagioclase ranges from An92 to An36; clinopyroxene ranges from Ca41Mg51Fe8 in the cores of phenocrysts to Ca40**36 Mg45**49Fe15**20 in the groundmass; and olivine ranges from Fo86 to Fo81.
The wide range in mineral compositions, together with evidence of disequilibrium based on textures and comparisons of glass and mineral compositions, indicate complex crystallization histories involving both polybaric crystal fractionation and magma mixing.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 22.840119 * Median Longitude: -108.476367 * South-bound Latitude: 22.748700 * West-bound Longitude: -108.748300 * North-bound Latitude: 22.883300 * East-bound Longitude: -107.903800
Date/Time Start: 1979-01-24T00:00:00 * Date/Time End: 1979-03-05T00:00:00
Event(s):
65-482D * Latitude: 22.788500 * Longitude: -107.991800 * Date/Time: 1979-01-24T00:00:00 * Elevation: -3008.0 m * Penetration: 186.5 m * Recovery: 64.2 m * Location: North Pacific/Gulf of California/CONT RISE * Campaign: Leg65 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 13 cores; 114 m cored; 0 m drilled; 56.3 % recovery
65-483 * Latitude: 22.883300 * Longitude: -108.748300 * Date/Time: 1979-02-12T00:00:00 * Elevation: -3070.0 m * Penetration: 204.5 m * Recovery: 110.7 m * Location: North Pacific/Gulf of California/CONT RISE * Campaign: Leg65 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 26 cores; 204.5 m cored; 0 m drilled; 54.1 % recovery
65-483B * Latitude: 22.883200 * Longitude: -108.747300 * Date/Time: 1979-02-12T00:00:00 * Elevation: -3070.0 m * Penetration: 267 m * Recovery: 91.8 m * Location: North Pacific/Gulf of California/CONT RISE * Campaign: Leg65 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 28 cores; 160.5 m cored; 28.5 m drilled; 57.2 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
9 datasets

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Datasets listed in this publication series

  1. Griffin, BJ; Neuser, RD; Schmincke, H-U (1983): (Table 9) Geochemistry of selected glass at DSDP Site 65-483. https://doi.org/10.1594/PANGAEA.818067
  2. Griffin, BJ; Neuser, RD; Schmincke, H-U (1983): (Table 10) Mineral and glass compositions for selected basalts from DSDP Site 65-483. https://doi.org/10.1594/PANGAEA.818068
  3. Griffin, BJ; Neuser, RD; Schmincke, H-U (1983): (Table 7) Geochemistry of selected plagioclase groundmass at DSDP Hole 65-483B. https://doi.org/10.1594/PANGAEA.818065
  4. Griffin, BJ; Neuser, RD; Schmincke, H-U (1983): (Table 8) Geochemistry of selected Fe/Ti-oxides at DSDP Leg 65 Holes. https://doi.org/10.1594/PANGAEA.818066
  5. Griffin, BJ; Neuser, RD; Schmincke, H-U (1983): (Table 4) Geochemistry of selected clinopyroxene phenocrysts at DSDP Leg 65 Holes. https://doi.org/10.1594/PANGAEA.818062
  6. Griffin, BJ; Neuser, RD; Schmincke, H-U (1983): (Table 5) Geochemistry of selected clinopyroxene groundmass crystals at DSDP Leg 65 Holes. https://doi.org/10.1594/PANGAEA.818063
  7. Griffin, BJ; Neuser, RD; Schmincke, H-U (1983): (Table 3) Geochemistry of selected olivine phenocrysts at DSDP Leg 65 Holes. https://doi.org/10.1594/PANGAEA.818061
  8. Griffin, BJ; Neuser, RD; Schmincke, H-U (1983): (Table 6) Geochemistry of selected plagioclase phenocrysts at DSDP Leg 65 Holes. https://doi.org/10.1594/PANGAEA.818064
  9. Griffin, BJ; Neuser, RD; Schmincke, H-U (1983): (Table 2) Textures and phenocryst abundances in DSDP Leg 65 Holes basalts. https://doi.org/10.1594/PANGAEA.818060