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Briqueu, Louis; Laporte, C; Crawford, Anthony J; Hasenaka, Toshiaki; Baker, Peter E; Coltorti, Massimo (1994): Sr, Nd and Pb isotopic composition of volcanic and volcaniclastic samples of ODP Leg 134 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.787578, Supplement to: Briqueu, L et al. (1994): Temporal magmatic evolution of the Aoba Basin, Central New Hebrides Island Arc: Pb, Sr, and Nd isotopic evidence for the coexistence of two mantle components beneath the Arc. In: Green, HG; Collot, J-Y; Stokking, LB; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 134, 393-401, https://doi.org/10.2973/odp.proc.sr.134.019.1994

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Abstract:
A suite of volcanic and volcaniclastic rocks selected from Ocean Drilling Program Leg 134 Sites 832 and 833 in the North Aoba Basin (Central New Hebrides Island Arc) has been analyzed for Sr, Nd, and Pb isotopes to investigate the temporal evolution of the arc magmatism. This arc shows two unusual features with respect to other western Pacific arcs: 1) subduction is eastdirected; and 2) a major submarine ridge, the d'Entrecasteaux Zone, has been colliding almost perpendicularly with the central part of the arc since about 3 Ma. Volcanic rocks from the upper parts of both holes, generated during the last 2 m.y., show higher 87Sr/86Sr and significantly lower 206Pb/204Pb and 143Nd/144 Nd values compared to those volcanics erupted before the collision of this ridge, as represented by samples from the lower section of both holes, or remote from the collisional region, in the southern part of the arc. These isotopic differences in the respective mantle sources cannot be interpreted in terms of geochemical input into the mantle wedge induced by the collision itself. Rather, they require long term (>500 m.y.) enrichment processes. The enriched mantle source could be, on a regional scale, a DUPAL-type reservoir with strong similarities to the source of Indian Ocean basalts. Isotopic analyses of drilled rocks from the DEZ show that the anomalous, enriched mantle component is not derived from this feature. We currently cannot identify a source for this enriched component, but note that it also exists in Lau Basin backarc volcanics, lavas from the West Philippine Sea, and also some lavas from the Mariana-Izu-Bonin arc.
Project(s):
Deep Sea Drilling Project (DSDP)
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -15.671633 * Median Longitude: 166.861033 * South-bound Latitude: -16.532000 * West-bound Longitude: 166.284000 * North-bound Latitude: -14.796000 * East-bound Longitude: 167.880000
Date/Time Start: 1973-05-07T00:00:00 * Date/Time End: 1990-12-14T00:30:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3 datasets

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Datasets listed in this publication series

  1. Briqueu, L; Laporte, C; Crawford, AJ et al. (1994): (Table 3) Sr, Nd, and Pb istopic ratios for DSDP Hole 30-286 volcanics and volcaniclastics. https://doi.org/10.1594/PANGAEA.787577
  2. Briqueu, L; Laporte, C; Crawford, AJ et al. (1994): (Table 2) Pb istopic ratios for ODP Leg 134 volcanics and volcaniclastics. https://doi.org/10.1594/PANGAEA.787575
  3. Briqueu, L; Laporte, C; Crawford, AJ et al. (1994): (Table 1) Sr and Nd istopic ratios for ODP Leg 134 volcanics and volcaniclastics. https://doi.org/10.1594/PANGAEA.787571