Petrogenesis of layered pyroxenites from the Lherz, Freychinéde and Prades ultramafic bodies (Ariége, French Pyrénées)

Details Petrogenesis of layered pyroxenites from the Lherz, Freychinéde and Prades ultramafic bodies (Ariége, French Pyrénées) Petrogenesis of layered pyroxenites from the Lherz, Freychinéde and Prades ultramafic bodies (Ariége, French Pyrénées)

Feb 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51..279b&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 51, Issue 2, pp.279-290

Physics

25

Scientific paper

The pyroxenite bands in spinel Iherzolites from three high-temperature peridotite massifs (Lherz, Freychinéde and Prades) in Ariège (French Pyrénées) have geochemical features including distributions of Mg, Ca, K, Ti, Zr and REE typical of cumulates derived by high P - T crystal segregation. However, these features of the whole-rocks are not reflected in the element distribution among the minerals which was partially modified during subsequent recrystallization. In addition, samples from the margins of the pyroxenite bands were affected by secondary processes such as metasomatism or subsolidus re-equilibration. Unlike pyroxenite xenoliths from basalts which are usually assumed to be derived from alkalic basaltic magmas, the pyroxenite layers are related to tholeiitic magmas similar to the parental liquids of the Triassic dolentes encountered throughout the Pyrénées. The data show that high P - T fractionation significantly affected the ascending tholeiitic magma and suggest that the continental tholeiites could have been derived from an upper mantle source with a chondrite shaped REE pattern.

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