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Geology; September 2002; v. 30; no. 9; p. 771-774; DOI: 10.1130/0091-7613(2002)030<0771:HIEFAH>2.0.CO;2
© 2002 Geological Society of America
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Hf isotope evidence for a hidden mantle reservoir

Martin Bizzarro*,1, Antonio Simonetti*,1, Ross K. Stevenson*,1 and Jean David*,1

1 Centre for Research in Isotopic Geochemistry and Geochronology (GÉOTOP), Université du Québec à Montréal, succursale Centre-ville, CP 8888, Montréal, Québec H3C 3P8, Canada

High-precision Hf isotopic analyses and U-Pb ages of carbonatites and kimberlites from Greenland and eastern North America, including Earth's oldest known carbonatite (3 Ga), indicate derivation from an enriched mantle source. This previously unidentified mantle reservoir—marked by an unradiogenic Hf isotopic composition and preserved in the deep mantle for at least 3 b.y.—may account for the mass imbalance in Earth's Hf-Nd budget. The Hf isotopic data presented here support a common mantle source region and genetic link between carbonatite and some oceanic- island basalt volcanoes.

Key Words: Hf isotopes • Archean • mantle • carbonatite • kimberlite




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