Contrasting geophysical and geochemical signatures of a volcano at the axis of the Wharton fossil ridge (N-E Indian Ocean)

Details Contrasting geophysical and geochemical signatures of a volcano at the axis of the Wharton fossil ridge (N-E Indian Ocean) Contrasting geophysical and geochemical signatures of a volcano at the axis of the Wharton fossil ridge (N-E Indian Ocean)

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.1053h&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 8, p. 1053-1056

Physics

Geophysics

7

Geochemistry: Marine Geochemistry, Marine Geology And Geophysics: Gravity, Marine Geology And Geophysics: Midocean Ridge Processes, Information Related To Geographic Region: Indian Ocean

Scientific paper

The Styx volcano is a prominent seamount (20-30 km diameter, 2500 m high) located at the axis of the Wharton fossil spreading center (N-E Indian Ocean), where seafloor spreading stopped 40 Ma ago. Gravity modeling shows that it was emplaced on a weak lithosphere, in agreement with an on axis origin when seafloor spreading was active. The rocks dredged at the summit of the volcano are extreme typical alkaline basalts, indicating a deep enriched mantle source. We show here that most of this seamount was emplaced during the final stage of the seafloor spreading in the Wharton Basin. We then discuss how alkaline magmatism can be emplaced at the summit of the Styx.

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