Ferrobasalts from the Central Indian Ocean Basin |
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| Authors: | S D Iyer R Mukhopadhyay and D C Popko |
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| Institution: | (1) (e-mail: iyer@csnio.ren.nic.in) National Institute of Oceanography, Dona Paula, Goa 403 004, India, IN;(2) Institute of Materials Processing, Michigan Technological University, Houghton, MI 49931-1295, USA, US |
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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.
Received: 27 January 1998 / Revision received: 25 May 1998 |
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