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Tamura, Akihiro; Arai, Shoji; Ishimaru, Satoko; Andal, Eric S (2008): Petrology and geochemistry of peridotites from IODP Site 304-U1309 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.772689, Supplement to: Tamura, A et al. (2008): Petrology and geochemistry of peridotites from IODP Site U1309 at Atlantis Massif, MAR 30°N: micro- and macro-scale melt penetrations into peridotites. Contributions to Mineralogy and Petrology, 155(4), 491-509, https://doi.org/10.1007/s00410-007-0254-0

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Abstract:
Peridotite samples recovered from IODP Site U1309 at the Atlantis Massif in the Mid-Atlantic Ridge were examined to understand magmatic processes for the oceanic core complex formation. Original peridotite was fragmented, and the limited short peridotite intervals are now surrounded by a huge gabbro body probably formed by late-stage melt injections. Each peridotite interval has various petrographical and geochemical features. A spinel harzburgite in contact with gabbro shows evidence of limited melt penetrations causing gradual compositional change, in terms of trace-element compositions of pyroxenes, as well as modal change near the boundary. Geochemistry of clinopyroxenes with least melt effects indicates that the harzburgite is originally mantle residue formed by partial melting under polybaric conditions, and that such a depleted peridotite is one of the components of the oceanic core complex. Some of plagioclase-bearing peridotites, on the other hand, have more complicated origin. Although their original features were partly overprinted by the injected melt, the original peridotites, both residual and non-residual materials, were possibly derived from the upper mantle. This suggests that the melt injected around an upper mantle region or into mantle material fragments. The injected melt was possibly generated at the ridge-segment center and, then, moved and evolved toward the segment end beneath the oceanic core complex.
Project(s):
Integrated Ocean Drilling Program / International Ocean Discovery Program (IODP)
Coverage:
Median Latitude: 30.168525 * Median Longitude: -42.119000 * South-bound Latitude: 30.168460 * West-bound Longitude: -42.119000 * North-bound Latitude: 30.168650 * East-bound Longitude: -42.119000
Event(s):
304-U1309B * Latitude: 30.168460 * Longitude: -42.119000 * Elevation: -1642.3 m * Recovery: 46.73 m * Campaign: Exp304 (Oceanic Core Complex Formation, Atlantis Massive 1) * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 20 cores; 101.8 m cored; 45.9 % recovered; 0 m drilled; 101.8 m penetrated
304-U1309D * Latitude: 30.168650 * Longitude: -42.119000 * Elevation: -1644.9 m * Recovery: 243.69 m * Campaign: Exp304 (Oceanic Core Complex Formation, Atlantis Massive 1) * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 77 cores; 380.7 m cored; 64 % recovered; 20.5 m drilled; 401.3 m penetrated
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
9 datasets

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Datasets listed in this publication series

  1. Tamura, A; Arai, S; Ishimaru, S et al. (2008): (Table 4) Major-element compositions of clinopyroxenes in peridotites from IODP Site 304-U1309. https://doi.org/10.1594/PANGAEA.772671
  2. Tamura, A; Arai, S; Ishimaru, S et al. (2008): (Table 8) Average trace-element compositions of clinopyroxenes in peridotites from IODP Site 304-U1309. https://doi.org/10.1594/PANGAEA.772680
  3. Tamura, A; Arai, S; Ishimaru, S et al. (2008): (Table 3) Average major-element compositions of olivines in peridotites from IODP Site 304-U1309. https://doi.org/10.1594/PANGAEA.772670
  4. Tamura, A; Arai, S; Ishimaru, S et al. (2008): (Table 5) Average major-element compositions of orthopyroxene in peridotites from IODP Site 304-U1309. https://doi.org/10.1594/PANGAEA.772672
  5. Tamura, A; Arai, S; Ishimaru, S et al. (2008): (Table 9) Average trace-element compositions of orthopyroxenes in peridotites from IODP Site 304-U1309. https://doi.org/10.1594/PANGAEA.772681
  6. Tamura, A; Arai, S; Ishimaru, S et al. (2008): (Table 1) Modal compositions of peridotites from IODP Site 304-U1309. https://doi.org/10.1594/PANGAEA.772662
  7. Tamura, A; Arai, S; Ishimaru, S et al. (2008): (Table 2) Average major-element compositions of spinels in peridotites from IODP Site 304-U1309. https://doi.org/10.1594/PANGAEA.772666
  8. Tamura, A; Arai, S; Ishimaru, S et al. (2008): (Table 7) Major-element compositions of mineral inclusions in peridotites from IODP Hole 304-U1309B. https://doi.org/10.1594/PANGAEA.772679
  9. Tamura, A; Arai, S; Ishimaru, S et al. (2008): (Table 6) Major-element compositions of plagioclase in peridotites from IODP Hole 304-U1309D. https://doi.org/10.1594/PANGAEA.772675