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Sato, Hiroshi (2004): Mineral composition of mid-ocean-ridge basalts from ODP Leg 187 sites [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.780714, Supplement to: Sato, H (2004): Mineral compositions of MORB from the Australian Antarctic Discordance (AAD): implications for mantle source characteristics. In: Pedersen, RB; Christie, DM; Miller, DJ (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 187, 1-26, https://doi.org/10.2973/odp.proc.sr.187.202.2004

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Abstract:
The chemical compositions of olivine, plagioclase, pyroxene, and spinel in lavas collected during Ocean Drilling Program Leg 187 in the Australian Antarctic Discordance, Southeast Indian Ridge (41°-46°S, 126°-135°E) were analyzed, and modeling of the theoretical equilibrium petrogenetic conditions between olivine and melt was conducted. The cores of larger olivine phenocrysts, particularly in the isotopic Indian-type mid-ocean-ridge basalt (MORB), are not equilibrated with melt compositions and are considered to be xenocrystic. Larger plagioclase phenocrysts with compositionally reversed zonation are also xenocrystic. The compositions of primary magma were calculated using a "maximum olivine fractionation" model for primitive MORB that should fractionate only olivine. Olivine compositions equilibrated with calculated primary magma and compositions of calculated primary magma suggest that (1) isotopic Pacific-type MORB is more fractionated than Indian-type MORB, (2) Pacific-type MORB was produced by higher degrees of partial melting than Indian-type MORB, and (3) primary magma for Indian-type MORB was segregated from mantle at 10 kbar (~30 km depth), whereas that for Pacific-type MORB was segregated at 15 kbar (~45 km depth).
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -43.292770 * Median Longitude: 130.137446 * South-bound Latitude: -44.633850 * West-bound Longitude: 127.746150 * North-bound Latitude: -41.271510 * East-bound Longitude: 134.998350
Date/Time Start: 1999-11-29T00:00:00 * Date/Time End: 2000-01-06T09:00:00
Event(s):
187-1153A * Latitude: -41.271510 * Longitude: 129.815130 * Date/Time Start: 1999-11-29T00:00:00 * Date/Time End: 1999-12-01T19:00:00 * Elevation: -5581.4 m * Penetration: 274.9 m * Recovery: 1.77 m * Location: Indian Ocean * Campaign: Leg187 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 1 core; 7.3 m cored; 0 m drilled; 24.2 % recovery
187-1154A * Latitude: -41.477830 * Longitude: 131.317260 * Date/Time Start: 1999-12-01T19:00:00 * Date/Time End: 1999-12-04T22:00:00 * Elevation: -5736.4 m * Penetration: 267.6 m * Recovery: 9.42 m * Location: Indian Ocean * Campaign: Leg187 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 8 cores; 34.4 m cored; 0 m drilled; 27.4 % recovery
187-1155A * Latitude: -41.958210 * Longitude: 127.994810 * Date/Time Start: 1999-12-04T22:00:00 * Date/Time End: 1999-12-07T03:30:00 * Elevation: -4975.4 m * Penetration: 203.5 m * Recovery: 2.34 m * Location: Indian Ocean * Campaign: Leg187 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 6 cores; 26.2 m cored; 0 m drilled; 8.9 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
6 datasets

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Datasets listed in this publication series

  1. Sato, H (2004): (Table T3) Calculated compositions of primary melts and equilibrated olivine for ODP Leg 187 sites. https://doi.org/10.1594/PANGAEA.780710
  2. Sato, H (2004): (Table T1) Chemical compositions of olivine grains in lavas collected from ODP Leg 187 sites. https://doi.org/10.1594/PANGAEA.780708
  3. Sato, H (2004): (Supplement Table 1) Chemical compositions of plagioclase grains in lavas collected from ODP Leg 187 sites. https://doi.org/10.1594/PANGAEA.780711
  4. Sato, H (2004): (Supplement Table 2) Chemical compositions of pyroxene grains in lavas collected from ODP Leg 187 sites. https://doi.org/10.1594/PANGAEA.780712
  5. Sato, H (2004): (Supplement Table 3) Chemical compositions of spinal grains in lavas collected from ODP Leg 187 sites. https://doi.org/10.1594/PANGAEA.780713
  6. Sato, H (2004): (Table T2) Whole-rock and glass compositions for olivine maximum fractionation calculations for ODP Leg 187 sites. https://doi.org/10.1594/PANGAEA.780709