Ishikawa, Akira et al. (2005) Jurassic oceanic lithosphere beneath the southern Ontong Java Plateau: Evidence from xenoliths in alnöite, Malaita, Solomon Islands, Geology, 33, 393-396, doi: 10.1130/G21205.1. < 20150916160914-271618 > pub
  • abstract:

    The least metasomatized xenoliths of spinel lherzolite and gabbro recovered from alnöite intruding crust of the southern Ontong Java Plateau on the island of Malaita yield an Sm-Nd age of ca. 160 Ma and an initial εNd value of ∼+8. In contrast, the plateau basement is ca. 120 Ma with initial εNd between +3.7 and +6.5. The xenoliths appear to represent normal Pacific oceanic lithosphere (uppermost mantle and lower crust) formed ∼40 m.y. before the plateau, indicating that the southern part of the plateau was emplaced off axis on mature seafloor. The closest 160 Ma seafloor to Malaita is >1800 km to the north, off the northeastern margin of the plateau, implying the presence of either an intervening large-offset fracture zone or a triple junction. The presence of significantly older oceanic lithosphere beneath the plateau places restrictions on proposed origins for the plateau.

  • doi: 10.1130/G21205.1
  • modified at 2019-09-03
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binder of Jurassic oceanic lithosphere beneath the southern Ontong Java Plateau: Evidence from xenoliths in alnöite, Malaita, Solomon Islands pub container 20190903093523-050382
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  • name
  • Ishikawa, Akira
  • Nakamura, E.
  • Mahoney, J. J.