Abundance and distribution of Cu-Fe-Ni sulfides, sulfur, copper and platinum-group elements in orogenic-type spinel lherzolite massifs of Ariège (northeastern Pyrenees, France)

Details Abundance and distribution of Cu-Fe-Ni sulfides, sulfur, copper and platinum-group elements in orogenic-type spinel lherzolite massifs of Ariège (northeastern Pyrenees, France) Abundance and distribution of Cu-Fe-Ni sulfides, sulfur, copper and platinum-group elements in orogenic-type spinel lherzolite massifs of Ariège (northeastern Pyrenees, France)

May 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989e%26psl..93...50l&link_type=abstract

Earth and Planetary Science Letters, Volume 93, Issue 1, p. 50-64.

Computer Science

31

Scientific paper

Modal sulfide variations, together with sulfur, copper and platinum-group element (PGE) geochemistry have been investigated in 58 spinel peridotite samples from orogenic-type massifs of Ariège (northeastern Pyrenees, France). These rocks are considered to record a sub-continental evolution marked by low to moderate degrees of partial melting in the garnet stability field. The peridotites contain spinel and/or garnet pyroxenitic layers and are locally cross-cut by amphibole-pyroxenite and hornblendite dykes. The peridotites sampled at distances > 50 cm from pyroxenites contain high-Ni, low-Cu sulfides which are considered to have survived mantle partial melting. The less depleted lherzolites have S, Cu, Pb and Pt contents closely similar to those of the Ivrea Verbano mantle peridotites, but in excess of upper mantle estimates based on spinel lherzolite xenoliths from alkali basalts. These rocks display nearly chondritic PGE distribution patterns which are attributed to the persistence of a residual sulfide phase after removal of a S-saturated tholeiitic partial melt. S and Cu have incompatible-like behaviour and decrease from the lherzolites to the harzburgites. The distribution of S, Cu and chalcophile PGE is nearly insensitive to crystallization of disseminated pargasite postdating partial melting. In contrast, these elements show pronounced variations of their concentration ranges in the peridotites adjacent to pyroxenites. The re-equilibration patterns are primarily dependent upon the nature of the magma precursor of the pyroxenites, the timing of S saturation in the latter and temperatures of the upper mantle during re-equilibration.

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