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Mehl, Klaus Wilhelm; Bitschene, Peter Rene; Schmincke, Hans-Ulrich; Hertogen, Jan GH (1991): Composition and alteration of volcanic rocks of ODP Hole 119-738C [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.757918, Supplement to: Mehl, KW et al. (1991): Composition, alteration, and origin of the basement lavas and volcaniclastic rocks st Site 738, southern Kerguelen Plateau. In: Barron, J; Larsen, B; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 119, 299-322, https://doi.org/10.2973/odp.proc.sr.119.130.1991

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Published: 1991 (exact date unknown) • DOI registered: 2011-03-29

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Abstract:
During ODP Leg 119 one basement hole was drilled at Site 738, on the Southern Kerguelen Plateau. The 38.2 m of basement rocks drilled comprises three basaltic aa-lava flows with basal and top breccias, overlain by Turanian marine carbonates. Site 738 basalts probably erupted near a fracture zone, and were emplaced during the plateau-forming stage of Kerguelen Plateau evolution under quiet, subaerial to shallow water conditions.
The basalts are T-MORB, chemically resembling Mesozoic continental flood basalts of the southern hemisphere. Two slightly different magma batches are distinguished by Fe, Ti, Al, Zr, and REE concentrations. Prior to eruption, the magmas had undergone significant olivine and some clinopyroxene fractionation. Incompatible and immobile trace element concentrations and ratios point to a veined upper mantle source, where a refractory mineral assemblage retains Nb, Ta, and the HREE. The basaltic melts derived from this regionally veined, enriched upper mantle have high LREE, and especially Ba and Th concentrations and bear the DUPAL isotopic signature gained from deep- seated, recycled, old oceanic(?) crust.
A saponite-celadonite secondary mineral assemblage confines the alteration temperature to <170°C. Alteration is accompanied by net gains of H2O, CO2, K2O, and Rb, higher oxidation, minor Na2O, SiO2 gains, and losses of V and CaO. Released Ca, together with Ca from seawater, precipitated as calcite in veins and vesicles, plumbed the circulation system and terminated the rock/open seawater interaction.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: -62.709000 * Longitude: 82.787800
Date/Time Start: 1988-01-11T18:45:00 * Date/Time End: 1988-01-17T05:00:00
Event(s):
119-738C * Latitude: -62.709000 * Longitude: 82.787800 * Date/Time Start: 1988-01-11T18:45:00 * Date/Time End: 1988-01-17T05:00:00 * Elevation: -2263.0 m * Penetration: 533.8 m * Recovery: 146.03 m * Location: Indian Ocean * Campaign: Leg119 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 35 cores; 337.2 m cored; 0 m drilled; 43.3 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
7 datasets

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Datasets listed in this publication series

  1. Mehl, KW; Bitschene, PR; Schmincke, H-U et al. (1991): (Table 4) Major and trace element concentrations of basement samples from ODP Hole 119-738C. https://doi.org/10.1594/PANGAEA.757904
  2. Mehl, KW; Bitschene, PR; Schmincke, H-U et al. (1991): (Table 5) CIPW norms of the freshest samples from ODP Hole 119-738C. https://doi.org/10.1594/PANGAEA.757908
  3. Mehl, KW; Bitschene, PR; Schmincke, H-U et al. (1991): (Table 2) Analyses of clinopyroxene of selected ODP Hole 119-738C samples. https://doi.org/10.1594/PANGAEA.757901
  4. Mehl, KW; Bitschene, PR; Schmincke, H-U et al. (1991): (Table 1) Analyses of primary and secondary feldspar of selected ODP Hole 119-738C samples. https://doi.org/10.1594/PANGAEA.757900
  5. Mehl, KW; Bitschene, PR; Schmincke, H-U et al. (1991): (Table 7) REE and trace element concentrations of selected ODP Hole 119-738C samples. https://doi.org/10.1594/PANGAEA.757909
  6. Mehl, KW; Bitschene, PR; Schmincke, H-U et al. (1991): (Figure 13) Stratigraphic distribution of secondary minerals in Unit VIII samples of ODP Hole 119-738C. https://doi.org/10.1594/PANGAEA.757917
  7. Mehl, KW; Bitschene, PR; Schmincke, H-U et al. (1991): (Table 3) Analyses of sheet silicates of selected ODP Hole 119-738C samples. https://doi.org/10.1594/PANGAEA.757903