Abstract
The MAPCO cruise of the RV J. Charcot sampled zero-age basalts along the Mid-Atlantic Ridge from the Azores Triple Junction to 24°N. Preliminary shipboard geochemical analyses together with earlier data show that some trace elements are not randomly distributed along the ridge. The latitude of the Hayes transform delineate two regions of rare earth element distribution: north from Hayes, is flat to light rare earth (or equivalent) enriched; south from Hayes, is light rare earth (or equivalent) depleted. These findings indicate large scale heterogeneity of the upper mantle.
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Author notes
The members of the MAPCO (part 1 and 2) scientific team were: J. Y. Bervas, P. Beuzart, P. Cambon, M. El Azzouzi, G. Floch; J. Guichardot-Wirrmann, S. Monti, J. L. Olivet (Centre Océanologique de Bretagne), J. Durand, S. Savary (IPG St-Maur), C. Bassoulet, P. Tarits (IPG Paris), J. Argyriadis (Orsay), J. P. Eissen (Strasbourg), A. Y. Le Dain (Montpellier), A. Gourgaud (Clermont Ferrand), P. Fetter (Tunis), J. L. Joron, G. Meyer (Lab. P. Sue, CNRS), J. Stroup (Albany, US), A. Graham (British Museum (Natural History) London, UK) & D. Wood (Birmingham, UK).
- H. Bougault
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Bougault, H., Treuil, M. Mid-Atlantic Ridge: zero-age geochemical variations between Azores and 22°N. Nature 286, 209–212 (1980). https://doi.org/10.1038/286209a0
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DOI: https://doi.org/10.1038/286209a0
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