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| West, Bp; Wilcock, Wsd; Sempere, Jc; Geli, Louis. |
| Both geophysical and geochemical evidence suggests the presence of along-axis asthenospheric flow toward the Australian-Antarctic Discordance (AAD) beneath the Southeast Indian Ridge (SEIR). We use a three-dimensional, finite-volume formulation of viscous flow to investigate the structure of asthenospheric motion beneath the SEIR. Our results show that simple continental separation in either a constant- or variable-viscosity mantle without horizontal temperature gradients is unable to reproduce the inferred asthenospheric flow velocities and observed geographic distribution of the ''Indian'' and ''Pacific'' upper mantle isotopic provinces. The presence of a cooler, more viscous mantle directly beneath the AAD is necessary to reproduce observed constraints.... |
| Tipo: Text |
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| Ano: 1997 |
URL: http://archimer.ifremer.fr/doc/00068/17903/15439.pdf |
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