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Coltorti, Massimo; Baker, Peter E; Briqueu, Louis; Hasenaka, Toshiaki; Galassi, B (1994): Petrology and geochemistry of volcanic rocks from ODP Sites 134-827, 134-829 and 134-830 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.787435, Supplement to: Coltorti, M et al. (1994): Petrology and geochemistry of volcanic rocks from the New Hebrides forearc region, Sites 827, 829, and 830. 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, 337-352, https://doi.org/10.2973/odp.proc.sr.134.015.1994

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Abstract:
Igneous rocks recovered from Ocean Drilling Program (ODP) Leg 134 Sites 827, 829, and 830 at the toe of the forearc slope of New Hebrides Island Arc were investigated, using petrography, mineral chemistry, major and trace element, and Sr, Nd, and Pb isotopic analyses.
Basaltic and andesitic clasts, together with detrital crystals of plagioclase, pyroxenes, and amphiboles embedded in sed-lithic conglomerate or volcanic siltstone and sandstone of Pleistocene age, were recovered from Sites 827 and 830. Petrological features of these lava clasts suggest a provenance from the Western Belt of New Hebrides Island Arc; igneous constituents were incorporated into breccias and sandstones, which were in turn reworked into a second generation breccia.
Drilling at Site 829 recovered a variety of igneous rocks including basalts and probably comagmatic dolerites and gabbros, plus rare ultramafic rocks. Geochemical features, including Pb isotopic ratios, of the mafic rocks are intermediate between midocean ridge basalts and island arc tholeiites, and these rocks are interpreted to be backarc basin basalts. No correlates of these mafic rocks are known from Espiritu Santo and Malakula islands, nor do they occur in the Pleistocene volcanic breccias at Sites 827 and 830. However, basalts with very similar trace element and isotopic compositions have been recovered from the northern flank of North d'Entrecasteaux Ridge at Site 828. It is proposed that igneous rocks drilled at Site 829 represent material from the North d'Entrecasteaux Ridge accreted onto the over-riding Pacific Plate during collision.
An original depleted mantle harzburgitic composition is inferred for a serpentinite clast recovered at 407 meters below seafloor (mbsf) in Hole 829A. Its provenance is a matter of speculation. It could have been brought up along a deep thrust fault affecting the Pacific Plate at the colliding margin, or analogous to the Site 829 basaltic lavas, it may represent material accreted from the North d'Entrecasteaux Ridge.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -15.442233 * Median Longitude: 166.436280 * South-bound Latitude: -15.950000 * West-bound Longitude: 166.345000 * North-bound Latitude: -15.295000 * East-bound Longitude: 166.780000
Date/Time Start: 1990-10-22T05:00:00 * Date/Time End: 1990-11-12T05:00:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
5 datasets

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Datasets listed in this publication series

  1. Coltorti, M; Baker, PE; Briqueu, L et al. (1994): (Table 3) Representative amphibole and olivine compositions from basaltic and gabbroic rocks from ODP Holes 134-827B and 134-829A. https://doi.org/10.1594/PANGAEA.787428
  2. Coltorti, M; Baker, PE; Briqueu, L et al. (1994): (Table 2) Representative clinopyroxene compositions from andesitic, basaltic, gabbroic, and ultramafic rocks from ODP Holes 134-827C and 134-829A. https://doi.org/10.1594/PANGAEA.787425
  3. Coltorti, M; Baker, PE; Briqueu, L et al. (1994): (Table 1) Major and trace element composition of igneous rocks from ODP Sites 134-829 and 134-830. https://doi.org/10.1594/PANGAEA.787426
  4. Coltorti, M; Baker, PE; Briqueu, L et al. (1994): (Table 4) Representative plagioclase and oxide compositions from basaltic, gabbroic, and ultramafic rocks from ODP Hole 134-829A. https://doi.org/10.1594/PANGAEA.787429
  5. Coltorti, M; Baker, PE; Briqueu, L et al. (1994): (Table 5) Sr, Nd, and Pb isotopic compositions of some igneous rocks from ODP Holes 134-829A and 134-830B. https://doi.org/10.1594/PANGAEA.787433