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Joron, Jean Louis; Bougault, Henri; Maury, R C; Bohn, Marcel; Desprairies, Alain (1984): Geochemistry and minerals at DSDP Leg 81 Holes [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.807088, Supplement to: Joron, JL et al. (1984): Strongly depleted tholeiites from the Rockall Plateau Margin, North Atlantic: geochemistry and mineralogy. In: Roberts, DG; Schnittker, D; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 81, 783-794, https://doi.org/10.2973/dsdp.proc.81.131.1984

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Published: 1984 (exact date unknown) • DOI registered: 2013-03-19

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Abstract:
The Leg 81 basalts, drilled either from the margins ("dipping reflectors" sequence: Holes 552, 553A, and 554A) or from the "continental" side (Hole 555) of the Rockall Plateau microcontinent, are strongly light rare-earth element (LREE) depleted oceanic tholeiites. The basalts from the four holes are almost similar. Most of their primary characteristics have been preserved, although they have suffered alteration by seawater. From the petrological and mineralogical points of view, they resemble deep-ocean-floor basalts but show some peculiarities (occurrence of pigeonite and ilmenite as normal components of the groundmass differentiation sequences toward ferrobasalts). Their geochemical characteristics are dominated by their extreme depletion in the most hygromagmaphile elements (Th, Ta, La, and Nb), the concentrations of which are sometimes lower than the corresponding chondritic values. Leg 81 basalts are thus clearly different from continental tholeiites (flood basalts): Possible equivalents in the Thulean Tertiary Magmatic Province include the LREE-depleted tholeiites from the Upper Basaltic Series of the Faeroe Islands and the Preshal Mhor basalt type from the British Tertiary Province.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 56.385544 * Median Longitude: -21.901851 * South-bound Latitude: 56.042700 * West-bound Longitude: -23.528200 * North-bound Latitude: 56.561700 * East-bound Longitude: -20.782200
Date/Time Start: 1981-07-31T00:00:00 * Date/Time End: 1981-08-31T00:00:00
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. Joron, JL; Bougault, H; Maury, RC et al. (1984): (Table 4) Geochemistry of groundmass Fe-Ti oxides at DSDP Holes 81-553A and 81-555. https://doi.org/10.1594/PANGAEA.807085
  2. Joron, JL; Bougault, H; Maury, RC et al. (1984): (Table 5) Geochemistry of feldspar at DSDP Hole 81-555. https://doi.org/10.1594/PANGAEA.807086
  3. Joron, JL; Bougault, H; Maury, RC et al. (1984): (Table 2) Geochemistry of olivine at DSDP Hole 81-555. https://doi.org/10.1594/PANGAEA.807083
  4. Joron, JL; Bougault, H; Maury, RC et al. (1984): (Table 3) Geochemistry of clinopyroxene at DSDP Leg 81 Holes. https://doi.org/10.1594/PANGAEA.807084
  5. Joron, JL; Bougault, H; Maury, RC et al. (1984): (Table 6) Geochemistry and minerals at DSDP Leg 81 Holes. https://doi.org/10.1594/PANGAEA.807087
  6. Joron, JL; Bougault, H; Maury, RC et al. (1985): (Table 1) Major elements of basalts at DSDP Leg 81 Holes. https://doi.org/10.1594/PANGAEA.807082