Fujii, Toshitsugu (1990): Chemistry of peridotites from ODP Hole 109-670A [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.745276, Supplement to: Fujii, T (1990): Petrology of peridotites from Hole 670A, Leg 109. In: Detrick, R; Honnorez, J; Bryan, WB; Juteau, T; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 106/109, 19-25, https://doi.org/10.2973/odp.proc.sr.106109.116.1990
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Abstract:
Two types of serpentinized peridotites from Hole 670A of Leg 109 were studied in detail. A small piece of relatively unaltered sample, 109-670A-9R-1, #3 (22-24 cm), is olivine websterite characterized by aluminous chromian spinel with Cr/(Cr + Al) ratio of about 0.2. The other minerals have compositions essentially identical with those in more commonly observed serpentinized harzburgite like 109-670A-9R-01, #12 (94-97 cm). The occurrence of pyroxene-rich peridotite with normal harzburgite suggests that small scale heterogeneity in modal compositions exists in the upper mantle beneath the Mid-Atlantic Ridge. Low Cr/Al ratios of spinel and pyroxenes of those peridotites indicate that they are relatively less refractory among peridotites ever recovered from the oceanic region.
Textures and the estimated equilibration temperatures indicate that peridotites recovered from Hole 670A are recrystallized and reequilibrated at subsolidus temperature. The occurrence of serpentinized peridotites from the rift valley of the active mid-oceanic ridge may suggest that they represent direct exposure of upwelling mantle materials rather than serpentine diapirs.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: 23.166600 * Longitude: -45.032200
Date/Time Start: 1986-06-12T01:30:00 * Date/Time End: 1986-06-16T16:15:00
Event(s):
109-670A * Latitude: 23.166600 * Longitude: -45.032200 * Date/Time Start: 1986-06-12T01:30:00 * Date/Time End: 1986-06-16T16:15:00 * Elevation: -3625.0 m * Penetration: 92.5 m * Recovery: 4.58 m * Location: South Atlantic Ocean * Campaign: Leg109 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 7 cores; 76.6 m cored; 0 m drilled; 6 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
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Datasets listed in this publication series
- Fujii, T (1990): (Table 1) Selected analyses of minerals of ODP sample 109-670A-9R-1, piece 3 (20-22 cm). https://doi.org/10.1594/PANGAEA.745274
- Fujii, T (1990): (Table 2) Selected analyses of minerals of ODP sample 109-670A-9R-1, piece 12 (94-97 cm). https://doi.org/10.1594/PANGAEA.745275