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Morche, Wolfgang; Hubberten, Hans-Wolfgang; Ehrmann, Werner; Keller, Jörg (1991): Geochemical investigations of volcanic ash layers from ODP Leg 119 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.758165, Supplement to: Morche, W et al. (1991): Geochemical investigations of volcanic ash layers from Leg 119, 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, 323-344, https://doi.org/10.2973/odp.proc.sr.119.124.1991

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Abstract:
Geochemical investigations were carried out on 19 discrete ash layers and on 42 dispersed ash accumulations in Oligocene to Pleistocene sediments from Sites 736, 737, 745, and 746 of ODP Leg 119 (Kerguelen Plateau in the southern Indian Ocean). The chemical data obtained from more than 500 single-grain glass analyses allow the characterization of two dominant petrographic rock series. The first consists of transitional- to alkali-basalts, the second mainly of trachytes with subordinated alkali-rhyolites and rhyolites. Chemical correlation with possible source areas indicates that the tephra layers from the northern Kerguelen Plateau Sites 736 and 737 were probably erupted from the nearby Kerguelen Islands. The investigated ash layers clearly reflect the Oligocene to recent changes in the composition of the volcanic material recorded from the Kerguelen Islands. The dispersed ashes from Sites 745 and 746 in the Australian-Antarctic Basin display almost the same range in chemical compositions as those from the north. Heard Island and other sources may have contributed to their formation, in addition to the Kerguelen Islands. Dispersed ash of calc-alkaline composition is most probably derived from the South Sandwich island arc, indicating sea-ice rafting as an important mechanism of transport.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -54.284165 * Median Longitude: 78.486597 * South-bound Latitude: -59.595000 * West-bound Longitude: 71.661500 * North-bound Latitude: -49.403000 * East-bound Longitude: 85.868200
Date/Time Start: 1987-12-26T02:30:00 * Date/Time End: 1988-02-12T18:00:00
Event(s):
119-736A * Latitude: -49.403000 * Longitude: 71.661500 * Date/Time Start: 1987-12-26T02:30:00 * Date/Time End: 1987-12-28T04:30:00 * Elevation: -640.0 m * Penetration: 252.3 m * Recovery: 147.05 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg119 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 30 cores; 250.3 m cored; 0 m drilled; 58.7 % recovery
119-737A * Latitude: -50.228000 * Longitude: 73.032400 * Date/Time Start: 1987-12-30T04:30:00 * Date/Time End: 1987-12-31T17:15:00 * Elevation: -575.0 m * Penetration: 273.2 m * Recovery: 181.64 m * Location: Indian Ocean * Campaign: Leg119 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 29 cores; 273.2 m cored; 0 m drilled; 66.5 % recovery
119-737B * Latitude: -50.228000 * Longitude: 73.032400 * Date/Time Start: 1987-12-31T17:15:00 * Date/Time End: 1988-01-04T09:30:00 * Elevation: -575.0 m * Penetration: 715.5 m * Recovery: 298.35 m * Location: Indian Ocean * Campaign: Leg119 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 50 cores; 481.3 m cored; 0 m drilled; 62 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
4 datasets

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Datasets listed in this publication series

  1. Morche, W; Hubberten, H-W; Ehrmann, W et al. (1991): (Table 4) Chemistry of ash layer samples of ODP Leg 119. https://doi.org/10.1594/PANGAEA.758163
  2. Morche, W; Hubberten, H-W; Ehrmann, W et al. (1991): (Table 1) Samples of discret tephra layers and dispersed ash material of ODP Leg 119. https://doi.org/10.1594/PANGAEA.758112
  3. Morche, W; Hubberten, H-W; Ehrmann, W et al. (1991): (Appendix) Major element analyses of glass samples of ODP Leg 119. https://doi.org/10.1594/PANGAEA.758164
  4. Morche, W; Hubberten, H-W; Ehrmann, W et al. (1991): (Table 3) Petrography of the ash samples of ODP Leg 119. https://doi.org/10.1594/PANGAEA.758160