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Trace-element fractionation in plumes and the origin of HIMU mantle beneath the Cameroon line

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Abstract

The lavas of the Cameroon line display a lead isotope anomaly at the continent/ocean boundary which can be attributed to a fossil mantle plume, the diminishing lateral effects of which can be recognized as far as 400km to either side. The high 206Pb/204Pb ratio—characteristic of the mantle endmember known as 'HIMU'—seems to arise from U/Pb fractionation accompanying melt migration following emplacement of the plume in the upper mantle 125 Myr ago.

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Author notes

  1. Jon P. Davidson & Peter Holden

    Present address: Department of Earth and Space Sciences, University of California, Los Angeles, California, 90024, USA

Authors and Affiliations

  1. Department of Geological Sciencies, University of Michigan, Ann Arbor, Michigan, 48109–1063, USA

    Alex N. Halliday, Jon P. Davidson, Peter Holden, Charles DeWolf & Der-Chuen Lee

  2. Grant Institute of Geology, University of Edinburgh, West Mains Road, Edinburgh, EH9 3JW, UK

    J. Godfrey Fitton

Authors
  1. Alex N. Halliday
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  2. Jon P. Davidson
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  3. Peter Holden
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  4. Charles DeWolf
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  5. Der-Chuen Lee
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  6. J. Godfrey Fitton
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Halliday, A., Davidson, J., Holden, P. et al. Trace-element fractionation in plumes and the origin of HIMU mantle beneath the Cameroon line. Nature 347, 523–528 (1990). https://doi.org/10.1038/347523a0

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