Kyte, Frank T; Bohor, Bruce F (1995): Compositions of Ni-rich magnesiowüstite and coexisting magnesioferrite spinel from sediments of DSDP Holes 86-577 and 91-596 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.708055, Supplement to: Kyte, FT; Bohor, BF (1995): Nickel-rich magnesiowüstite in Cretaceous/Tertiary boundary spherules crystallized from ultramafic, refractory silicate liquids. Geochimica et Cosmochimica Acta, 59(23), 4967-4974, https://doi.org/10.1016/0016-7037(95)00343-6
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Abstract:
We have found trace inclusions of Ni-rich magnesiowüstite within grains of magnesioferrite spinel recovered from Cretaceous/Tertiary boundary sediments from DSDP Site 596, South Pacific (23°51.20'S, 169°39.27'W) and DSDP Site 577, North Pacific (3°6.51'N, 157°43.40'E). Measured compositions of these inclusions range from (Mg_0.85Ni_0.74Fe_0.17)O to (Mg_0.74Ni_0.09Fe_0.17)O. Coexisting magnesioferrite and magnesiowüstite can only crystallize from ultramafic, refractory, Mg-rich liquids with Mg/Si > 2 (atom ratio). Such liquid compositions cannot form as a result of fractional crystallization and are unknown to occur as a result of terrestrial igneous processes or meteoroid ablation. We infer that these minerals crystallized from liquid droplets that equilibrated with silicate vapor at high temperatures (probably >2300°C), resulting in fractionation of volatile SiO2 from more refractory MgO. The most plausible source of this high-temperature vapor is in the fireball of the major impact event that terminated the Cretaceous.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 4.294250 * Median Longitude: 176.034400 * South-bound Latitude: -23.853300 * West-bound Longitude: 157.723300 * North-bound Latitude: 32.441800 * East-bound Longitude: -165.654500
Date/Time Start: 1982-05-23T00:00:00 * Date/Time End: 1983-02-12T00:00:00
Event(s):
86-577 * Latitude: 32.441800 * Longitude: 157.723300 * Date/Time: 1982-05-23T00:00:00 * Elevation: -2675.0 m * Penetration: 118.8 m * Recovery: 111.1 m * Location: North Pacific * Campaign: Leg86 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 13 cores; 118.8 m cored; 0 m drilled; 93.5 % recovery
91-596 * Latitude: -23.853300 * Longitude: -165.654500 * Date/Time: 1983-02-12T00:00:00 * Elevation: -5701.0 m * Penetration: 76.1 m * Recovery: 41.3 m * Location: South Pacific * Campaign: Leg91 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 8 cores; 66.5 m cored; 9.6 m drilled; 62.1 % 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
- Kyte, FT; Bohor, BF (1995): (Table 2) Averages of microprobe analyses on Ni-rich magnesiowüstite and coexisting magnesioferrite spinel from DSDP Hole 86-577 sediments. https://doi.org/10.1594/PANGAEA.708050
- Kyte, FT; Bohor, BF (1995): (Table 2) Averages of microprobe analyses on Ni-rich magnesiowüstite and coexisting magnesioferrite spinel from DSDP Hole 91-596 sediments. https://doi.org/10.1594/PANGAEA.708051