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Crustal contamination versus enriched mantle: 143Nd/144Nd and 87Sr/86Sr evidence from the Italian volcanics

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Abstract

143Nd/144Nd, 87Sr/86Sr, and REE analyses are presented on a wide variety of Pliocene-Recent volcanic rocks from central Italy. 143Nd/144Nd varies from 0.51214–0.51289 and 87Sr/86Sr from 0.7255-0.7036; while the rare earth elements are characterised by light RE enrichment and a significant negative Eu anomaly. These Italian volcanics are tentatively subdivided into three zones: (1) N. Tuscany where the magmas are believed to reflect crustal anatexis. (2) A central zone in which hybrid (crust/ mantle) rocks have been recognised. (3) A southern zone, south of Rome, where mantle-derived magmas are identified which have been largely unaffected by interaction with continental crust. At Roccamonfina, in zone 3, Rb/Sr and Sm/Nd pseudo isochrons are observed but since the calculated ages are 0.5 and 2.0 b.y. respectively it is argued that a simple isochron model is not applicable and that the data are most easily explained by a recent mixing event within the upper mantle. It is envisaged that this occurred during metasomatism of the upper mantle source region by a fluid that had high 87Sr/86Sr and low 143Nd/144Nd and was enriched in K, Rb, and LREE's but relatively depleted in Sr2+ and Eu2+.

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Author notes

  1. C. J. Hawkesworth

    Present address: Department of Earth Sciences, The Open University, Walton Hall, MK7 6AA, Milton, Keynes, Great Britain

  2. R. Vollmer

    Present address: Graduate School of Oceanography, University of Rhode Island, 02881, Kingston, RI, USA

Authors and Affiliations

  1. Department of Earth Sciences, University of Leeds, LS2 9JT, Leeds, Great Britain

    C. J. Hawkesworth & R. Vollmer

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  1. C. J. Hawkesworth
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  2. R. Vollmer
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Hawkesworth, C.J., Vollmer, R. Crustal contamination versus enriched mantle: 143Nd/144Nd and 87Sr/86Sr evidence from the Italian volcanics. Contr. Mineral. and Petrol. 69, 151–165 (1979). https://doi.org/10.1007/BF00371858

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  • DOI: https://doi.org/10.1007/BF00371858

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