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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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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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Authors and Affiliations

  1. U.S. Geological Survey, 80225, Denver, Colorado, USA

    Carl E. Hedge & Kiyoto Futa

  2. Scripps Inst. of Oceanography, La Jolla, California, USA

    Celeste G. Engel & Robert L. Fisher

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  1. Carl E. Hedge
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  2. Kiyoto Futa
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  3. Celeste G. Engel
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  4. Robert L. Fisher
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Hedge, C.E., Futa, K., Engel, C.G. et al. Rare earth abundances and Rb-Sr systematics of basalts, gabbro, anorthosite and minor granitic rocks from the Indian Ocean Ridge System, Western Indian Ocean. Contr. Mineral. and Petrol. 68, 373–376 (1979). https://doi.org/10.1007/BF01164522

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  • DOI: https://doi.org/10.1007/BF01164522

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