Furuta, Toshio; Tokuyama, Hidekazu (1983): Modes of occurrence and geochemistry at DSDP Holes 69-505A and 69-505B [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.817000, Supplement to: Furuta, T; Tokuyama, H (1983): Chromian spinels in Costa Rica Rift basalts, Deep Sea Drilling Project Site 505 - A preliminary interpretation of electron microprobe analyses. In: Cann, JR; Langseth, MG; Honnorez, J; Von Herzen, RP; White, SM; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 69, 805-810, https://doi.org/10.2973/dsdp.proc.69.153.1983
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Abstract:
The compositions of chrome spinels of Costa Rica Rift basalts from Deep Sea Drilling Project Site 505 vary depending on their occurrences as (1) inclusions in olivine crystals, (2) inclusions in Plagioclase crystals, and (3) isolated crystals in variolitic or glassy samples. The variations are a consequence of (1) changes of melt compositions as crystallization proceeds, and (2) contrasting behavior of olivine and Plagioclase in competition with spinels for Al and Mg. Some spinels have skeletal rims compositionally less magnesian than mineral cores; however, the cores do not appear to be xenocrysts, unlike some texturally similar spinels in Mid-Atlantic Ridge basalts.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 1.918400 * Median Longitude: -83.789150 * South-bound Latitude: 1.916800 * West-bound Longitude: -83.790000 * North-bound Latitude: 1.920000 * East-bound Longitude: -83.788300
Date/Time Start: 1979-09-29T00:00:00 * Date/Time End: 1979-09-29T00:00:00
Event(s):
69-505A * Latitude: 1.916800 * Longitude: -83.790000 * Date/Time: 1979-09-29T00:00:00 * Elevation: -3525.0 m * Penetration: 208.6 m * Recovery: 0.8 m * Location: North Pacific/GRABEN * Campaign: Leg69 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 3 cores; 12.1 m cored; 0 m drilled; 6.6 % recovery
69-505B * Latitude: 1.920000 * Longitude: -83.788300 * Date/Time: 1979-09-29T00:00:00 * Elevation: -3507.0 m * Penetration: 178 m * Recovery: 6.8 m * Location: North Pacific/GRABEN * Campaign: Leg69 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 6 cores; 42 m cored; 0 m drilled; 16.3 % 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
- Furuta, T; Tokuyama, H (1983): (Table 3) Chemical composition and structural formulas of chromian spinels from DSDP Holes 69-505A and 69-505B. https://doi.org/10.1594/PANGAEA.816999
- Furuta, T; Tokuyama, H (1983): (Table 2) Modes of occurrence of chromian spinels as inclusions in phenocrysts and as isolated grains in basalts from DSDP Holes 69-505A and 69-505B. https://doi.org/10.1594/PANGAEA.816998