Rare earth abundances and Rb-Sr systematics of basalts,gabbro, anorthosite and minor granitic rocks from the Indian Ocean Ridge System,Western Indian Ocean |
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Authors: | Carl E. Hedge Kiyoto Futa Celeste G. Engel Robert L. Fisher |
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Affiliation: | (1) U.S. Geological Survey, 80225 Denver, Colorado, USA;(2) Scripps Inst. of Oceanography, La Jolla, California, USA |
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Abstract: | 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. |
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