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Lees, G J; Rowbotham, G; Floyd, Peter A (1992): Geochemistry of volcaniclastites of the western Pacific Ocean. PANGAEA, https://doi.org/10.1594/PANGAEA.771436, Supplement to: Lees, GJ et al. (1992): Petrography and geochemistry of graded volcaniclastic sediments and their Ccasts, 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, 137-152, https://doi.org/10.2973/odp.proc.sr.129.114.1992

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Abstract:
Samples collected from the coarse basal portions of mid-Cretaceous volcaniclastic turbidites from the Mariana and Pigafetta basins are remarkably similar in terms of the petrographic and chemical features of their igneous clasts and bulk rock composition. Clasts of magmatic origin are dominated by glassy vesicular shards, variably phyric, holocrystalline basalts, and crystal fragments (olivine, clinopyroxene, plagioclase, amphibole, and biotite). The composition of the pyroxenes and amphiboles are typical of those found in differentiated hydrous alkali basalts. The bulk chemical composition of the volcaniclastites (based on stable incompatible elements and their ratios in highly vitric samples) is characteristic of alkali basalts found in within-plate oceanic eruptive environments. Miocene volcaniclastites from Site 802 are broadly similar to the Cretaceous samples in terms of clast type and bulk composition, and have also been derived from an oceanic alkali basalt source. The chemistry of the Miocene volcaniclastites differ, however, in having distinctive Zr/Y and Zr/Nb ratios and a more restricted chemical composition. The magmatic products of nearly emergent seamounts within the western Pacific basins appears to have been dominated by alkali basalt volcanism during the mid-Cretaceous and also the Miocene.
The highly vitric nature of the Cretaceous and Miocene volcaniclastites, together with the morphology and vesicularity of their shards, suggests that they are the reworked (via mass flow) products of hyaloclastite accumulations produced in a shallow-water eruptive environment, such as that adjacent to nearly emergent seamounts or ocean islands. The association of ooids, reefal debris, and, in rare cases, woody material with the volcaniclastites supports their shallow-water derivation.
Project(s):
Coverage:
Median Latitude: 17.536511 * Median Longitude: 153.383986 * South-bound Latitude: 12.096300 * West-bound Longitude: 152.322900 * North-bound Latitude: 21.923000 * East-bound Longitude: 156.359700
Date/Time Start: 1989-11-26T02:45:00 * Date/Time End: 1990-01-04T17:20:00
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 * Device: Drilling/drill rig (DRILL) * Comment: 61 core; 544.4 m cored; 0 m drilled; 27.7 % recovery
129-801A * Latitude: 18.642800 * Longitude: 156.359500 * Date/Time Start: 1989-12-06T17:15:00 * Date/Time End: 1989-12-09T17:00:00 * Elevation: -5685.0 m * Penetration: 194 m * Recovery: 31.49 m * Location: North Pacific Ocean * Campaign: Leg129 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 20 cores; 186 m cored; 0 m drilled; 16.9 % 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 * Device: Drilling/drill rig (DRILL) * Comment: 44 cores; 317.2 m cored; 0 m drilled; 18.7 % recovery
Size:
9 datasets

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Datasets listed in this publication series

  1. Lees, GJ; Rowbotham, G; Floyd, PA (1992): (Appendix A) Recalculated chemical composition of Cretaceous volcaniclastites from Unit IV of ODP Holes 129-800A. https://doi.org/10.1594/PANGAEA.771433
  2. Lees, GJ; Rowbotham, G; Floyd, PA (1992): (Appendix B) Recalculated chemical composition of Cretaceous volcaniclastites from Unit III of ODP Site 129-801 and Units VIII to IX of ODP Hole 129-802A. https://doi.org/10.1594/PANGAEA.771434
  3. Lees, GJ; Rowbotham, G; Floyd, PA (1992): (Appendix C) Recalculated chemical composition of Miocene volcaniclastites from Unit II of ODP Hole 129-802A. https://doi.org/10.1594/PANGAEA.771435
  4. Lees, GJ; Rowbotham, G; Floyd, PA (1992): (Table 1) Comparison of petrographic features in Cretaceous and Miocene volcaniclastites from ODP Leg 129 sites. https://doi.org/10.1594/PANGAEA.771423
  5. Lees, GJ; Rowbotham, G; Floyd, PA (1992): (Table 2) Mineral composition of Cretaceous volcaniclastites. https://doi.org/10.1594/PANGAEA.771424
  6. Lees, GJ; Rowbotham, G; Floyd, PA (1992): (Table 3) Chemical variation in smectites from different locations within sample 129-800A-33R-4,146-150. https://doi.org/10.1594/PANGAEA.771425
  7. Lees, GJ; Rowbotham, G; Floyd, PA (1992): (Table 4) Chemical composition of Cretaceous volcaniclastites from Unit IV of ODP Hole 129-800A. https://doi.org/10.1594/PANGAEA.771428
  8. Lees, GJ; Rowbotham, G; Floyd, PA (1992): (Table 5) Chemical composition of Cretaceous volcaniclastites from Units VIII to IX of ODP Holes 129-801A and 129-802A. https://doi.org/10.1594/PANGAEA.771429
  9. Lees, GJ; Rowbotham, G; Floyd, PA (1992): (Table 6) Chemical composition of Miocene volcaniclastites from Units II of ODP Holes 129-802A. https://doi.org/10.1594/PANGAEA.771430