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Frey, Frederick A; Jones, William B; Davies, Hugh L; Weis, Dominique A M (1991): Geochemistry and petrology of ODP Leg 121 basalts [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.759550, Supplement to: Frey, FA et al. (1991): Geochemical and petrologic data for basalts from Sites 756, 757, and 758: implications for the origin and evolution of the Ninetyeast Ridge. In: Weissel, J; Peirce, J; Taylor, E; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 121, 611-659, https://doi.org/10.2973/odp.proc.sr.121.163.1991

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Abstract:
Basement lavas from Sites 756, 757, and 758 on Ninetyeast Ridge are tholeiitic basalts. Lavas from Sites 756 and 757 appear to be subaerial eruptives, but the lowermost flows from Hole 758A are pillow lavas. In contrast to the compositional variation during the waning stages of Hawaiian volcanism, no alkalic lavas have been recovered from Ninetyeast Ridge and highly evolved lavas were recovered from only one of seven drill sites (DSDP Site 214). All lavas from Site 758 have relatively high MgO contents (8-10 wt%), and they are less evolved than lavas from Sites 756 and 757.
Although abundances of alkali metals in these Ninetyeast Ridge basalts were significantly modified by postmagmatic alteration, abundances of other elements reflect magmatic processes. At Site 757 most of the lavas are Plagioclase cumulates, but lava compositions require two compositionally distinct, AhCb-rich parental magmas, perhaps segregated at relatively low mantle pressures. In addition, at both Sites 756 and 758 more than one compositionally distinct parental magma is required. The compositions of these Ninetyeast Ridge lavas, especially those from Site 758, require a source component with a depleted composition; specifically, the abundance ratios Th/Ta, Th/La, Ba/Nb, Ba/La, and La/Ce in these lavas are generally less than the ratios inferred for primitive mantle. Lavas from Ninetyeast Ridge and the Kerguelen Archipelago have very different chondrite-normalized REE patterns, with lower light REE/heavy REE (LREE/HREE) ratios in lavas from Ninetyeast Ridge. However, lavas from Sites 757 and 758 have Pb isotope ratios that overlap with the field defined by lavas from the Kerguelen Archipelago (Weis and Frey, this volume). Therefore, these Ninetyeast Ridge lavas contain more of a component that is relatively depleted in LREE and other highly incompatible elements, but have similar amounts of the component that controls radiogenic Pb isotopes.
A model involving mixing between components related to a depleted source and an enriched plume source has been proposed for the oldest Kerguelen Archipelago basalts and Ninetyeast Ridge lavas. Although the incompatible element characteristics of the Ninetyeast Ridge lavas are intermediate between depleted MORB and Kerguelen Archipelago basalts, these data are not consistent with a simple two-component mixing process. A more complex model is required.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -10.553199 * Median Longitude: 88.969514 * South-bound Latitude: -27.355000 * West-bound Longitude: 87.597400 * North-bound Latitude: 5.384200 * East-bound Longitude: 90.361200
Date/Time Start: 1988-05-26T00:00:00 * Date/Time End: 1988-06-24T13:30:00
Event(s):
121-756C * Latitude: -27.354000 * Longitude: 87.598200 * Date/Time Start: 1988-05-26T00:00:00 * Date/Time End: 1988-05-27T18:45:00 * Elevation: -1527.0 m * Penetration: 159 m * Recovery: 61.81 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg121 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 11 core; 76.6 m cored; 0 m drilled; 80.7 % recovery
121-756D * Latitude: -27.355000 * Longitude: 87.597400 * Date/Time Start: 1988-05-27T18:45:00 * Date/Time End: 1988-05-29T10:30:00 * Elevation: -1524.0 m * Penetration: 221 m * Recovery: 46.04 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg121 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 11 core; 101.2 m cored; 0 m drilled; 45.5 % recovery
121-757 * Latitude: -17.023667 * Longitude: 88.181133 * Date/Time Start: 1988-06-01T00:00:00 * Date/Time End: 1988-06-05T00:00:00 * Elevation: -1659.7 m * Penetration: 804.9 m * Recovery: 349.1 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg121 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 55 cores; 490.3 m cored; 0 m drilled; 71.2% recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
9 datasets

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Datasets listed in this publication series

  1. Frey, FA; Jones, WB; Davies, HL et al. (1991): (Appendix B) Analyses of alteration minerals of ODP Leg 121 basalts. https://doi.org/10.1594/PANGAEA.759543
  2. Frey, FA; Jones, WB; Davies, HL et al. (1991): (Table 1) Geochemistry of ODP Leg 121 basalts. https://doi.org/10.1594/PANGAEA.759539
  3. Frey, FA; Jones, WB; Davies, HL et al. (1991): (Table 2) Geochemistry and Lead isotope ratios of ODP Leg 121 basalts. https://doi.org/10.1594/PANGAEA.759540
  4. Frey, FA; Jones, WB; Davies, HL et al. (1991): (Appendix B) Analyses of clinopyroxene of ODP Leg 121 basalts. https://doi.org/10.1594/PANGAEA.759544
  5. Frey, FA; Jones, WB; Davies, HL et al. (1991): (Table 3) Composition of lavas of ODP Leg 121. https://doi.org/10.1594/PANGAEA.759541
  6. Frey, FA; Jones, WB; Davies, HL et al. (1991): (Appendix B) Analyses of trapped melt and groundmass of ODP Leg 121 basalts. https://doi.org/10.1594/PANGAEA.759549
  7. Frey, FA; Jones, WB; Davies, HL et al. (1991): (Appendix B) Analyses of plagioclase and K-feldspar of ODP Leg 121 basalts. https://doi.org/10.1594/PANGAEA.759545
  8. Frey, FA; Jones, WB; Davies, HL et al. (1991): (Appendix B) Analyses of sulfides of ODP Leg 121 basalts. https://doi.org/10.1594/PANGAEA.759547
  9. Frey, FA; Jones, WB; Davies, HL et al. (1991): (Appendix B) Analyses of titanomagnetite and ilmenite of ODP Leg 121 basalts. https://doi.org/10.1594/PANGAEA.759548