Origins of the mafic and ultramafic rocks in the Ronda peridotite

Details Origins of the mafic and ultramafic rocks in the Ronda peridotite Origins of the mafic and ultramafic rocks in the Ronda peridotite

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987e%26psl..85..183s&link_type=abstract

Earth and Planetary Science Letters, Volume 85, Issue 1-3, p. 183-202.

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35

Scientific paper

The Ronda peridotite massif in southern Spain originated from the upper mantle, evidently as a rapidly rising diapir. Major and trace element abundance trends of the peridotites reflect their origin as residues from partial melting of garnet lherzolite. About 5% of the massif consists of mafic rocks, mainly pyroxenites and gabbros. They occur as concordant layers amidst the peridotites, and these layers do not cross-cut each other. However, major and trace element data show that the mafic layers do not have the geochemical characteristics of primary melts. We conclude that crystal/liquid fractionation occurred at high pressures ( > 19 kbar) as melts migrated through magma conduits towards the cooler exterior portion of the diapir. This process generated a sequence of ``cumulates'' (mainly clinopyroxene + orthopyroxene + spinel and clinopyroxene + garnet) along the walls of the conduits which are now represented by the mafic layers.

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