Unknown
PANGAEA
In:
Supplement to: Furuta, Toshio; Tokuyama, Hidekazu (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
Publication Date:
2023-06-27
Description:
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.
Keywords:
69-505A; 69-505B; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Leg69; North Pacific/GRABEN
Type:
Dataset
Format:
application/zip, 2 datasets
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