Isotope evidence of a mantle convection boundary at the Australian-Antartic Discordance

Details Isotope evidence of a mantle convection boundary at the Australian-Antartic Discordance Isotope evidence of a mantle convection boundary at the Australian-Antartic Discordance

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988natur.333..623k&link_type=abstract

Nature (ISSN 0028-0836), vol. 333, June 16, 1988, p. 623-629. NSF-Navy-supported research.

Computer Science

72

Basalt, Convection, Earth Mantle, Geochemistry, Geodynamics, Isotopic Enrichment, Antarctic Regions, Australia, Geomorphology, Lead Isotopes, Neodymium Isotopes, Strontium Isotopes

Scientific paper

Basalts from the Southeast Indian Ridge south of Australia form two geographically and isotopically distinct groups that show affinities with either Indian Ocean or Pacific/Atlantic Ocean isotope compositions. The data raise the possibility that there is a sharp boundary between the Indian and Pacific Ocean isotope provinces. The isotope boundary occurs over less than 200 km within the Australian-Antartic Discordance, a tectonically complex region believed to overlie a zone of downwelling mantle flow.

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