Fountain, John C; Jacobi, Robert D; Fahey, Timothy J (1985): Petrology and geochemistry of basalts at DSDP Hole 86-581 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.802825, Supplement to: Fountain, JC et al. (1985): Petrology and geochemistry of basalts from Deep Sea Drilling Project Leg 86, Site 581. In: Heath GR; Burckle LH; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 86, 691-697, https://doi.org/10.2973/dsdp.proc.86.132.1985
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Abstract:
Approximately 5 m of aphyric to sparsely phyric basalt was recovered from Hole 581, the only hole on Leg 86 where basement was cored. The occurrence of samples with altered glassy rinds indicates that at least three cooling units (pillows or thin flows) were sampled. The samples were moderately to intensely altered; groundmass crystals are generally fresh, but all glass is altered. Alteration is greatest in vesicular samples, but most of the samples have fractures filled with iron oxyhydroxide, clay, and/or calcite.
All 13 samples analyzed are moderately fractionated aluminous N-type mid-ocean ridge basalts. The samples can be divided into two groups based on TiO2 and FeO contents. The least-evolved group may be derived from a more primitive mid-ocean ridge basalt by the crystallization of 18% plagioclase, 24% clinopyroxene, and 3% olivine. The more evolved group may be derived from the first group by the fractionation of 18% plagioclase, 11% clinopyroxene, and 3% olivine. However, higher Ce/Yb ratios in the more evolved group cannot be produced by fractionation and thus we must invoke a more complex process such as dynamic melting to relate the two groups to a common source.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Latitude: 43.927000 * Longitude: 159.796000
Date/Time Start: 1982-06-10T00:00:00 * Date/Time End: 1982-06-10T00:00:00
Event(s):
86-581 * Latitude: 43.927000 * Longitude: 159.796000 * Date/Time: 1982-06-10T00:00:00 * Elevation: -5476.0 m * Penetration: 352.5 m * Recovery: 77.6 m * Campaign: Leg86 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 19 cores; 172 m cored; 180.5 m drilled; 45.1 % 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
- Fountain, JC; Jacobi, RD; Fahey, TJ (1985): (Table 2) Geochemistry at DSDP Hole 86-581. https://doi.org/10.1594/PANGAEA.802823
- Fountain, JC; Jacobi, RD; Fahey, TJ (1985): (Table 1) Petrography at DSDP Hole 86-581. https://doi.org/10.1594/PANGAEA.802822