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Ishii, Teruaki; Robinson, Paul T; Maekawa, Hirokazu; Fiske, Richard (1992): Geochemistry of peridotites from ODP Leg 125 diapiric serpentinites [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.770907, Supplement to: Ishii, T et al. (1992): Petrological studies of peridotites from diapiric serpentinite seamounts in the Izu-Ogasawara-Mariana Forearc, Leg 125. In: Fryer, P; Pearce, JA; Stokking, LB; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 125, 445-485, https://doi.org/10.2973/odp.proc.sr.125.129.1992

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Abstract:
Refractory spinel peridotites were drilled during Leg 125 from two diapiric serpentinite seamounts: Conical Seamount in the Mariana forearc (Sites 778-780) and Torishima Forearc Seamount (Sites 783-784) in the Izu-Ogasawara forearc. Harzburgite is the predominant rock type in the recovered samples, with subordinate dunite; no lherzolite was found.
The harzburgite is diopside-free to sparsely diopside-bearing, with modal percentages of diopside that range from 0% to 2%. Spinels in the harzburgites are chrome-rich (Cr/[Cr + Al] = 0.38-0.83; Fe3+/[Fe3+ + Cr + Al] = 0.01-0.07). Olivine and orthopyroxene are magnesian (Mg# = 0.92). Discrete diopsides reveal extreme depletion of light rare earth elements. Primary hornblende is rare. The bulk major-element chemistry shows low average values of TiO2 (trace), Al2O3 (0.55%) and CaO (0.60%), but high Mg# (0.90).
These rocks are more depleted than the abyssal peridotites from the mid-oceanic ridge. They are interpreted as residues of extensive partial melting (= 30%), of which the last episode was in the mantle wedge, probably associated with the generation of incipient island-arc magma, including boninite and/or arc-tholeiite. These depleted peridotites probably represent the residues of melting within mantle diapirs that developed within the mantle wedge.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 25.547365 * Median Longitude: 144.078192 * South-bound Latitude: 19.499000 * West-bound Longitude: 141.738000 * North-bound Latitude: 30.964300 * East-bound Longitude: 146.696000
Date/Time Start: 1986-03-26T10:30:00 * Date/Time End: 1989-03-31T10:00:00
Event(s):
125-778A * Latitude: 19.499000 * Longitude: 146.666000 * Date/Time Start: 1989-02-22T06:30:00 * Date/Time End: 1989-02-24T19:25:00 * Elevation: -3924.0 m * Penetration: 107.6 m * Recovery: 22.8 m * Location: North Pacific Ocean * Campaign: Leg125 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 13 cores; 107.6 m cored; 0 m drilled; 21.2 % recovery
125-779A * Latitude: 19.512500 * Longitude: 146.696000 * Date/Time Start: 1989-02-28T10:00:00 * Date/Time End: 1989-03-04T03:00:00 * Elevation: -3958.0 m * Penetration: 317.2 m * Recovery: 73.24 m * Location: North Pacific Ocean * Campaign: Leg125 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 37 cores; 317.2 m cored; 0 m drilled; 23.1 % recovery
125-780C * Latitude: 19.542200 * Longitude: 146.653500 * Date/Time Start: 1989-03-06T05:00:00 * Date/Time End: 1989-03-09T04:30:00 * Elevation: -3095.0 m * Penetration: 163.5 m * Recovery: 14.44 m * Location: North Pacific Ocean * Campaign: Leg125 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 18 cores; 163.5 m cored; 0 m drilled; 8.8 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
10 datasets

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Datasets listed in this publication series

  1. Ishii, T; Robinson, PT; Maekawa, H et al. (1992): (Appendix B) Major element concentrations of chromian-spinels in perdiotites of ODP Leg 125 samples. https://doi.org/10.1594/PANGAEA.770903
  2. Ishii, T; Robinson, PT; Maekawa, H et al. (1992): (Appendix C) Major element concentrations of olivines in perdiotites of ODP Leg 125 samples. https://doi.org/10.1594/PANGAEA.770905
  3. Ishii, T; Robinson, PT; Maekawa, H et al. (1992): (Appendix A) Major element concentrations of peridotites of ODP Leg 125 samples. https://doi.org/10.1594/PANGAEA.770894
  4. Ishii, T; Robinson, PT; Maekawa, H et al. (1992): (Appendix D) Major element concentrations of pyroxenes in perdiotites of ODP Leg 125 samples. https://doi.org/10.1594/PANGAEA.770906
  5. Ishii, T; Robinson, PT; Maekawa, H et al. (1992): (Table 9) Selected analyses of diopsides in peridotites from ODP Leg 125 samples. https://doi.org/10.1594/PANGAEA.770887
  6. Ishii, T; Robinson, PT; Maekawa, H et al. (1992): (Table 8) Selected analyses of hornblende in harzburgite from ODP Hole 125-784A. https://doi.org/10.1594/PANGAEA.770885
  7. Ishii, T; Robinson, PT; Maekawa, H et al. (1992): (Table 5) Selected analyses of chromium-spinels in peridotites from ODP Leg 125 samples. https://doi.org/10.1594/PANGAEA.770880
  8. Ishii, T; Robinson, PT; Maekawa, H et al. (1992): (Table 6) Selected analyses of olivines in peridotites from ODP Leg 125 samples. https://doi.org/10.1594/PANGAEA.770882
  9. Ishii, T; Robinson, PT; Maekawa, H et al. (1992): (Table 4) Comparison of wet chemical and XRF analyses of refractory peridotites of ODP Leg 125 samples. https://doi.org/10.1594/PANGAEA.770878
  10. Ishii, T; Robinson, PT; Maekawa, H et al. (1992): (Table 7) Selected analyses of pyroxenes in peridotites from ODP Leg 125 samples. https://doi.org/10.1594/PANGAEA.770883