Petrology and Geochemistry of MORB from 30° E to 50° E along the Southwest Indian Ridge: Marion Hotspot/Ridge interaction?

Details Petrology and Geochemistry of MORB from 30° E to 50° E along the Southwest Indian Ridge: Marion Hotspot/Ridge interaction? Petrology and Geochemistry of MORB from 30° E to 50° E along the Southwest Indian Ridge: Marion Hotspot/Ridge interaction?

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufm.t31d..12b&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #T31D-12

Physics

8100 Tectonophysics

Scientific paper

The Southwest Indian ridge extends from the indian Ocean Triple Junction, to the Bouvet Triple Junction; it has been spreading at very low rates throughout the Cenozoic and today is one of the slowest spreading major ridge on the planet, with a half-rate of only 0.6 to 0.9 cm/yr. Our investigation of the Southwest Indian Ridge started 3 years ago with an intense sampling of the active ridge axis between 69° E and 49° E with the Marion Dufresne (EDUL). The SWIFT cruise is the continuity of the petrological and geochemical investigation of the ridge westward up to 50° E. This portion of the ridge axis is known to be the most extreme DUPAL signal of the global ridge system. However, the relatively poor zero-age sampling of this aera does not allow us to determine the "shape" of this anomaly. Is there any organized evolution of the basalt geochemistry such as that around Hot Spot? Are the step-like isotope variations bounded by fracture zones? Is there any mantle temperature control on the isotopic domains along this portion of the Southwest Indian Ridge? During the SWIFT cruise, we made 36 dredges and 15 rock cores between 30° E and 50° E. Major element analyses show that most of the basalts are tholeiitic except between 38.9° E and 38.4° E where andesitic basalts have been dredged. Normal and enriched basalts have been collected along the ridge (0.05

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