Beni Bousera orogenic peridotit

When Beni Bousera and Ronda are excluded, the tme orogenic garnet peridotites have not been much studied from the geochemical point of view. As they witness deep mantle processes that are hardly accessible to the observation otherwise, these rocks represent an exciting field of investigation for the future. 

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).

Pearson D. G., Davies G. R., Nixon P. H., and Mattey D. P. (1991b) A carbon isotope study of diamond facies pyroxenites and associated rocks from the Beni Bousera peridotite, north Morocco. 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. 175-189. 

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