Ferrobasalts from the Central Indian Ocean Basin |
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Authors: | S. D. Iyer R. Mukhopadhyay D. C. Popko |
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Affiliation: | 1. National Institute of Oceanography, Dona Paula, 403 004, Goa, India 2. Institute of Materials Processing, Michigan Technological University, 49931-1295, Houghton, MI, USA
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Abstract: | We report the occurrence of ferrobasalts recovered from the Central Indian Ocean Basin crust generated at the Southeast Indian Ridge during a phase of moderate to fast spreading accretion (~110–190?mm/yr, full rate).The rocks are rich in plagioclase, FeO* (13–19%), and TiO2 (2.27–2.76%), poor in olivine and MgO (3.44–6.20%), and associated with topographic highs and increased amplitude magnetic anomalies corresponding to chrons A25 and A24. We suggest that secon dary eruptions from ancient N-MORB magma, which may have been trapped at a shallow depth in a horizon of neutral buoyancy, could have produced the ferrobasalts. |
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