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Bourgois, Jacques; Desmet, Alain; Tournon, Jean; Aubouin, Jean (1985): Elemental and mineral composition of DSDP Leg 84 Holes [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.803996, Supplement to: Bourgois, J et al. (1985): Mafic and ultramific rocks of Leg 84: Petrology and mineralogy. In: von Heune, R; Aubouin, J; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 84, 633-642, https://doi.org/10.2973/dsdp.proc.84.120.1985

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Abstract:
Ultramafic rocks were recovered from the lower parts of holes at four sites (567, 566, 569, 570) drilled on Leg 84. These sites are on the landward slope of the Middle America Trench off Guatemala. Harzburgites, cumulative texture peridotites, gabbros, dolerites, and amphibolite facies rocks were recognized by pétrologie and geochemical analysis (Xray fluorescence, microprobe). Some of these rocks belong to an ophiolitic sequence. They form the basement of the landward slope of the Guatemala Trench upon which lower Eocene sediments were deposited. As a whole, the ophiolitic rock has much in common with various ophiolitic massives known on land all over the world (e.g., Antalya, Oman), particularly the ophiolitic sequence of the Santa Elena Peninsula of Costa Rica. The age, the abundance of harzburgites, and the structural position of the mafic and ultramafic rocks of Leg 84 suggest that they could represent an offshore equivalent of the Santa Elena ultramafic rocks. In any case, the first ophiolites to have been recovered from the slope of an active margin are those of the drilled mafic and ultramafic rocks of Leg 84.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 12.846621 * Median Longitude: -90.925320 * South-bound Latitude: 12.716000 * West-bound Longitude: -91.392800 * North-bound Latitude: 13.285300 * East-bound Longitude: -90.692200
Date/Time Start: 1982-01-24T00:00:00 * Date/Time End: 1982-02-17T00:00:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
6 datasets

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Datasets listed in this publication series

  1. Bourgois, J; Desmet, A; Tournon, J et al. (1985): (Table 5) Clinopyroxenes from gabbros, dolerites, and basalts at DSDP Site 84-567. https://doi.org/10.1594/PANGAEA.803993
  2. Bourgois, J; Desmet, A; Tournon, J et al. (1985): (Table 2) Olivines from ultramafic rocks at DSDP Hole 84-567A and Site 84-566. https://doi.org/10.1594/PANGAEA.803989
  3. Bourgois, J; Desmet, A; Tournon, J et al. (1985): (Table 3) Analyses of ultramafic rock pyroxenes at DSDP Hole 84-567A and Site 84-566. https://doi.org/10.1594/PANGAEA.803990
  4. Bourgois, J; Desmet, A; Tournon, J et al. (1986): (Table 6) Amphiboles from gabbros and amphibolites at DSDP Holes 84-567A and 84-569. https://doi.org/10.1594/PANGAEA.803994
  5. Bourgois, J; Desmet, A; Tournon, J et al. (1985): (Table 1) Major element composition and CIPW norms at DSDP Leg 84 Holes. https://doi.org/10.1594/PANGAEA.803988
  6. Bourgois, J; Desmet, A; Tournon, J et al. (1985): (Table 4) Analyses of ultramafic rock spinels at DSDP Leg 84 Holes. https://doi.org/10.1594/PANGAEA.803991