Ishikawa, Akira et al. (2007) Ancient recycled crust beneath the Ontong Java Plateau: Isotopic evidence from the garnet clinopyroxenite xenoliths, Malaita, Solomon Islands, Earth and Planetary Science Letters, 259, 134--148, doi: 10.1016/j.epsl.2007.04.034. < 20150917173008-446954 > pub

Map on Earth or stone. Places and analyses are shown.

  • abstract:

    We present a Sr, Nd, Hf and Pb isotope investigation of a set of garnet clinopyroxenite xenoliths from Malaita, Solomon Islands in order to constrain crustal recycling in the Pacific mantle. Geological, thermobarometric and petrochemical evidence from previous studies strongly support an origin as a series of high-pressure (> 3 GPa) melting residues of basaltic material incorporated in peridotite, which was derived from Pacific convective mantle related to the Ontong Java Plateau magmatism. The present study reveals isotopic variations in the pyroxenites that are best explained by different extents of chemical reaction with ambient peridotite in the context of a melting of composite source mantle. Isotopic compositions of bimineralic garnet clinopyroxenites affected by ambient peridotite fall within the oceanic basalt array, similar to those of Ontong Java Plateau lavas. In contrast, a quartz-garnet clinopyroxenite, whose major element compositions remain intact, has lower 206Pb/204Pb–143Nd/144Nd and higher 87Sr/86Sr–207Pb/204Pb ratios than most oceanic basalts. These isotopic signatures show some affinity with proposed recycled sources such as the so-called EM-1 or DUPAL types. Constraints from major and trace element characteristics of the quartz-garnet clinopyroxenite, the large extent of Hf–Nd isotopic decoupling and the good coincidence of Pb isotopes to the Stacey–Kramers curve, all indicate that pollution of southern Pacific mantle occurred by the subduction or delamination of Neoproterozoic granulitic lower crust (0.5–1 Ga). This crustal recycling could have taken place around the suture of Rodinia supercontinent, a part of which resurfaced during mantle upwelling responsible for creating the Cretaceous Ontong Java Plateau.

  • doi: 10.1016/j.epsl.2007.04.034
  • modified at 16 h ago


(a) TIMS on TIMS Finnigan MAT261, MAT262 and Triton TI
(b) Hf isotopes_procedures of Lu et al. (2007) on MC-ICP-MS Finnigan, Neptune


(a) Q-ICP-MS_procedures of Makishima and Nakamura (1997, 1999, 2006) on Q-ICPMS Agilent 7500cs
(b) TIMS on TIMS Finnigan MAT261, MAT262 and Triton TI
(c) ICPMS with isotope dilution and internal standardization on Q-ICPMS Agilent 7500cs
Img 4839 thumb SAE116 < 20111128093932-459-753 >pub
  • classification: xenolithic
  • physical-form: grain
  • status: (unknown)
  • description: Ontong Java Plateau, Malaitan xenoliths, garnet clinopyroxenite
  • modified at 2019-09-03
Img 7918@c81a46acd353dcfb42eb4a3 thumb cpx-SAE113 < 20130228090217-163-658 >pub
  • classification: mineral:pyroxene
  • physical-form: grain
  • status: (unknown)
  • modified at 2020-04-28
Img 7917@bfe761bb284ac27c7a1fa68 thumb grt-SAE113 < 20130228090210-831-232 >pub
  • classification: mineral:garnet
  • physical-form: grain
  • status: (unknown)
  • modified at 2020-04-28
Img 4841 thumb SAE152C < 20111128093947-661-568 >pub
  • classification: xenolithic
  • physical-form: grain
  • status: (unknown)
  • description: Ontong Java Plateau, Malaitan xenoliths, garnet clinopyroxenite
  • modified at 2019-09-04
Ti hr 1444616937 thumb SAA1 < 20200205102720-611244 >pub
  • classification: plutonic:ultramafic
  • physical-form: powder
  • quantity (g): 15.2
  • description: Malaita, Solomon Islands ; alnöite
  • modified at 2020-04-28
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name spots global-id
caption ID assembly stone
Table 2. Rb-Sr, Sm-Nd, Lu-Hf and U-Th-Pb isotope data for garnet clinopyroxenete xenoliths frim the Malaita, Solomon Islands pub 20190904142630-284682 isotopes (Ishikawa et al., 2007) 10
Table 1. Trace element concentration data (ppm) for garnet clinopyroxenite xenoliths from the Malaita, Solomon Islands (SIMS) pub 20190904113055-451015 trace_SIMS (Ishikawa et al., 2007) 6
Table 1. Trace element concentration data (ppm) for garnet clinopyroxenite xenoliths from the Malaita, Solomon Islands (ICP MS, TIMS) pub 20190903120918-976116 trace (Ishikawa et al., 2007) 11
manual
  • name
  • Ishikawa, Akira
  • Kuritani, Takeshi
  • Makishima, Akio
  • Nakamura, E.