Rare earth abundances and Rb-Sr systematics of basalts, gabbro, anorthosite and minor granitic rocks from the Indian Ocean Ridge System, Western Indian Ocean

Autor:	Hedge, Carl E., Futa, Kiyoto, Engel, Celeste G., Fisher, Robert L.
Zdroj:	Contributions to Mineralogy and Petrology; December 1979, Vol. 68 Issue: 4 p373-376, 4p
Abstrakt:	Basalts dredged from the Mid-Indian Ocean Ridge System have rare earth, Rb, and Sr concentrations like those from other mid-ocean ridges, but have slightly higher Sr87/Sr86 ratios. Underlying gabbroic complexes are similar to the basalts in Sr87/Sr86, but are poorer K, Rb, and in rare earths. The chemical and isotopic data, as well as the geologic relations suggest a cumulate origin for the bulk of the gabbroic complexes.
Databáze:	Supplemental Index
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