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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DOI: https://doi.org/10.1038/309753a0
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