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Wood, D A; Joron, Jean Louis; Treuil, M; Norry, Michael J; Tarney, J (1979): Chemical composition and isotopic ratios of basic lavas from Iceland and the surrounding ocean floor [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.667460, Supplement to: Wood, DA et al. (1979): Elemental and Sr isotope variations in basic lavas from Iceland and the surrounding ocean floor. Contributions to Mineralogy and Petrology, 70(3), 319-339, https://doi.org/10.1007/BF00375360

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Abstract:
Major and trace dement data are used to establish the nature and extent of spatial and temporal chemical variations in basalts erupted in the Iceland region of the North Atlantic Ocean. The ocean floor samples are those recovered by legs 38 and 49 of the Deep Sea Drilling Project. Within each of the active zones on Iceland there are small scale variations in the light rare earth elements and ratios such as K/Y: several central complexes and their associated fissure swarms erupt basalts with values of K/Y distinct from those erupted at adjacent centres; also basalts showing a wide range of immobile trace element ratios occur together within single vertical sections and ocean floor drill holes. Although such variations can be explained in terms of the magmatic processes operating on Iceland they make extrapolations from single basalt samples to mantle sources underlying the outcrop of the sample highly tenuous.
87Sr/86Sr ratios measured for 25 of the samples indicate a total range from 0.7028 in a tholeiite from the Reykjanes Ridge to 0.7034 in an alkali basalt from Iceland and are consistent with other published ratios from the region. A positive correlation between 87Sr/86Sr and Ce/Yb ratios indicates the existence of systematic isotopic and elemental variations in the mantle source region. An approximately fivefold variation in Ce/Yb ratio observed in basalts with the same 87Sr/86Sr ratio implies that different degrees and types of partial melting have been involved in magma genesis from a single mantle composition. 87Sr/86Sr ratios above 0.7028, Th/U ratios close to 4 and La/Ta ratios close to 10 distinguish most basalts erupted in this part of the North Atlantic Ocean from normal mid-ocean ridge basalt (N-type MORB) – although N-type MORB has been erupted at extinct spreading axes just to the north and northeast of Iceland as well as the presently active Iceland-Jan Mayen Ridge.
Comparisons with the hygromagmatophile element and radiogenic isotope ratios of MORB and the estimated primordial mantle indicate that the mantle sources producing Iceland basalts have undergone previous depletion followed by more recent enrichment events. A veined mantle source region is proposed in preference to the mantle plume model to explain the chemical variations.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 66.676566 * Median Longitude: -9.471563 * South-bound Latitude: 62.616300 * West-bound Longitude: -30.576000 * North-bound Latitude: 76.149700 * East-bound Longitude: 7.875300
Date/Time Start: 1974-08-07T00:00:00 * Date/Time End: 1976-08-02T00:00:00
Event(s):
38-336 * Latitude: 63.351000 * Longitude: -7.787800 * Date/Time: 1974-08-07T00:00:00 * Elevation: -811.0 m * Penetration: 515 m * Recovery: 219.9 m * Location: North Atlantic/Norwegian Sea * Campaign: Leg38 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 42 cores; 383.5 m cored; 19 m drilled; 57.3 % recovery
38-337 * Latitude: 64.871700 * Longitude: -5.341800 * Date/Time: 1974-08-11T00:00:00 * Elevation: -2631.0 m * Penetration: 132.5 m * Recovery: 90.2 m * Location: North Atlantic/Norwegian Sea/BASIN * Campaign: Leg38 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 14 cores; 123 m cored; 0 m drilled; 73.3 % recovery
38-338 * Latitude: 67.785200 * Longitude: 5.387700 * Date/Time: 1974-08-14T00:00:00 * Elevation: -1297.0 m * Penetration: 437 m * Recovery: 207.8 m * Location: North Atlantic/Norwegian Sea/PLATEAU * Campaign: Leg38 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 45 cores; 427.5 m cored; 0 m drilled; 48.6 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
14 datasets

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Datasets listed in this publication series

  1. Wood, DA; Joron, JL; Treuil, M et al. (1979): (Table 2) Major and trace element concentrations of basalts from DSDP Hole 38-336. https://doi.org/10.1594/PANGAEA.667447
  2. Wood, DA; Joron, JL; Treuil, M et al. (1979): (Table 2) Major and trace element concentrations of basalts from DSDP Hole 38-337. https://doi.org/10.1594/PANGAEA.667448
  3. Wood, DA; Joron, JL; Treuil, M et al. (1979): (Table 2) Major and trace element concentrations of basalts from DSDP Hole 38-338. https://doi.org/10.1594/PANGAEA.667449
  4. Wood, DA; Joron, JL; Treuil, M et al. (1979): (Table 2) Major and trace element concentrations of basalts from DSDP Hole 38-342. https://doi.org/10.1594/PANGAEA.667450
  5. Wood, DA; Joron, JL; Treuil, M et al. (1979): (Table 2) Major and trace element concentrations of basalts from DSDP Hole 38-343. https://doi.org/10.1594/PANGAEA.667451
  6. Wood, DA; Joron, JL; Treuil, M et al. (1979): (Table 2) Major and trace element concentrations of basalts from DSDP Hole 38-344. https://doi.org/10.1594/PANGAEA.667452
  7. Wood, DA; Joron, JL; Treuil, M et al. (1979): (Table 2) Major and trace element concentrations of basalts from DSDP Hole 38-345. https://doi.org/10.1594/PANGAEA.667453
  8. Wood, DA; Joron, JL; Treuil, M et al. (1979): (Table 2) Major and trace element concentrations of basalts from DSDP Hole 38-348. https://doi.org/10.1594/PANGAEA.667454
  9. Wood, DA; Joron, JL; Treuil, M et al. (1979): (Table 2) Major and trace element concentrations of basalts from DSDP Hole 38-350. https://doi.org/10.1594/PANGAEA.667455
  10. Wood, DA; Joron, JL; Treuil, M et al. (1979): (Table 3) Strontium isotope ratios of basalts from DSDP Hole 49-407. https://doi.org/10.1594/PANGAEA.667456
  11. Wood, DA; Joron, JL; Treuil, M et al. (1979): (Table 3) Strontium isotope ratios of basalts from DSDP Hole 49-408. https://doi.org/10.1594/PANGAEA.667457
  12. Wood, DA; Joron, JL; Treuil, M et al. (1979): (Table 3) Strontium isotope ratios of basalts from DSDP Hole 49-409. https://doi.org/10.1594/PANGAEA.667458
  13. Wood, DA; Joron, JL; Treuil, M et al. (1979): (Table 3) Strontium isotope ratios of lavas from Iceland active zones. https://doi.org/10.1594/PANGAEA.667459
  14. Wood, DA; Joron, JL; Treuil, M et al. (1979): (Table 1) Major and trace element concentrations of lavas from Iceland active zones. https://doi.org/10.1594/PANGAEA.667445