REE and Sr-Nd Isotopic Geochemistry of Eastern Pyrenean Peridotite Massifs: Sub-Continental Lithospheric Mantle Modified by Continental Magmatism
- 1 January 1991
- journal article
- Published by Oxford University Press (OUP) in Journal of Petrology
- Vol. Special_um (2) , 97-115
- https://doi.org/10.1093/petrology/special_volume.2.97
Abstract
Separated and leached minerals from >40 samples from Eastern Pyrenean ultramafic massifs have been analysed for rare earth elements (REEs), and Sr and Nd isotope ratios. The sub-continental lithospheric mantle in this region has interacted with several different episodes of niagmatic activity since at least the Palaeozoic. The range of isotopic composition in the massifs is extreme for mantle material (87Sr/86Sr =0·7020−0·7050; 143Nd/144Nd = 0·5139−0·5121), although the dominant lithologies, spinel lherzolite and spinel websterite, are isotopically much more homogeneous.Keywords
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