Saunders, Andrew D (1986): Geochemistry of basalts at DSDP Site 89-462 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.794473, Supplement to: Saunders, AD (1986): Geochemistry of basalts from the Nauru Basin, Deep Sea Drilling Project Legs 61 and 89: Implications for the origin of oceanic flood basalts. In: Moberly, R; Schlanger, SO; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 89, 499-517, https://doi.org/10.2973/dsdp.proc.89.118.1986
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Abstract:
At Site 462 in the Nauru Basin, western Pacific Ocean, 56 lithologic units have been recovered from an extensive flood basalt province. Fossil evidence suggests that the lavas were emplaced during the interval 100-115 Ma, some 30 m.y. after formation of the underlying Jurassic ocean crust. The lithologic units can be broadly divided into three chemical units, the lowermost two of which are chemically monotonous, suggesting rapid eruption of basalt from a compositionally homogeneous magma chamber. All the basalts are hypersthene- (hy-) rich tholeiites, with approximately chondritic La/Sm, La/Yb, Zr/Nb, La/Ta, and Th/Hf ratios. Chemically they resemble, in part, "transitional" mid-ocean ridge basalts (MORB) from areas such as the Reykjanes Ridge, although Rb, Ba, and K contents are very low and similar to those of "normal" MORB. Their 87Sr/86Sr ratios are higher than in N-type MORB (Fujii et al., 1981). The chemistry of the Nauru basalts differs from that of continental flood basalts, which tend to be strongly enriched in large-ion lithophile (LIL) elements, although the extent to which the differences result from sialic contamination or source variability is not clear.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 7.239600 * Median Longitude: 165.031100 * South-bound Latitude: 7.237500 * West-bound Longitude: 165.030500 * North-bound Latitude: 7.241700 * East-bound Longitude: 165.031700
Date/Time Start: 1982-11-05T00:00:00 * Date/Time End: 1982-11-05T00:00:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
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Datasets listed in this publication series
- Saunders, AD (1986): (Table 3) Minor- and trace elements at DSDP Hole 89-462. https://doi.org/10.1594/PANGAEA.794472
- Saunders, AD (1986): (Table 1) Major elements at DSDP Hole 89-462A. https://doi.org/10.1594/PANGAEA.794471