Ferrobasalts from the Central Indian Ocean Basin
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 secondary 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.
Ferrobasalts from the Central Indian Ocean Basin.
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