A large-scale isotope anomaly in the Southern Hemisphere mantle

Abstract

Basalts from many Southern Hemisphere regions have anomalous Sr and Pb isotopic characteristics. This article shows that the isotopic mantle anomaly is globe-encircling in extent, centred on latitude 30° S. Arguments suggesting that this mantle anomaly has been in existence for billions of years place severe constraints on mantle convection models.

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Hart, S. A large-scale isotope anomaly in the Southern Hemisphere mantle. Nature 309, 753–757 (1984). https://doi.org/10.1038/309753a0

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