Orogenic peridotite massifs Pyrenees peridotites

The chemical diversity of mantle pyroxenites is also patent from REE variations. Figure 26 shows the chondrite-normahzed REE patterns of representative pyroxenites from orogenic peridotite massifs in Eastern Pyrenees (Lherz and Freychi-nede) and the Betico-Rifean Belt (Ronda and Beni Bousera). These rocks show variable REE distributions, but some relationships are observed between the structural and/or mineralogical types of pyroxenites and the REE patterns ... 

Figure 26 Chondrite-nomialized abundances of REEs in representative mafic rocks from the Beni Bousera, Ronda, and Pyrenees orogenic peridotite massifs. Data from Bodinier et al. (1987a, 1987b, 1990), Bodinier (1989), Komprobst et al. (1990), Pearson et al. (1993), Remaidi (1993), McPherson (1994), Garrido (1995), McPherson et al. (1996), and Garrido and Bodinier (1999). Normalizing values after Sun and McDonough (1989).

Mukasa S. B., Shervais J. W., Wilshire H. G., and Nielson J. E. (1991) Intrinsic Nd, Pb and Sr isotopic heterogeneities exhibited by the Lherz alpine peridotite massif, French Pyrenees. In Orogenic Lherzolites and Mantle Processes. Spec. Vol. J. Petrol, (eds. M. A. Menzies, C. Dupuy, and A. Nicolas). Oxford University Press, Oxford, UK, pp. 117-134. 

However, a few examples of metasomatism and chemical enrichment by alkaline, deep-seated melts have been described, notably in the St. Paul s Island oceanic peridotites, in the Atlantic Ocean (Roden et al., 1984) and in the Lherz orogenic massif and neighboring massifs such as Caussou, in the Eastern Pyrenees (Fabries et al., 1989 Bodinier et al., 1988, 1990). 

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