Anomalous upper mantle beneath the Australian-Antarctic discordance

Details Anomalous upper mantle beneath the Australian-Antarctic discordance Anomalous upper mantle beneath the Australian-Antarctic discordance

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987e%26psl..84..471f&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 84, no. 4, Aug. 1987, p. 471-478.

Computer Science

54

Anomalies, Antarctic Regions, Australia, Earth Mantle, Ocean Bottom, Bathymeters, Lithosphere, Phase Velocity, Rayleigh Waves

Scientific paper

Within the Australian-Antarctic discordant zone, residual depth anomalies approach 1000 m. In sea floor younger than 10 Ma that is more than 500 m deeper than expected, Rayleigh wave phase velocities are significantly faster than in sea floor of comparable age in the Pacific. In this area, the shear wave velocity in the 20-40 km depth range is unusually fast, indicating that the lithosphere develops more rapidly than usual from an asthenosphere that is perhaps cooler than average. In sea floor that is older than 10 Ma, phase velocities are anomalously fast and independent of the residual depth. Beneath this older sea floor, the low-velocity zone in the oceanic mantle is much less pronounced than beneath sea floor of comparable age in the Pacific.

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