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Free Content The behaviour of trace elements in high-P mineral assemblages: a LA-ICP-MS study of mafic rocks from the Nevado-Filábride complex (SE Spain)

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Trace-element data (obtained by LA-ICP-MS) from garnet, clinopyroxene, amphibole, zoisite/epidote, paragonite and phengite from foliated eclogites and coronitic metagabbros and high-pressure amphibolites from the Nevado-Filábride complex (SE Spain) are reported in this work. Rb, Cs and Ba are concentrated in white mica, whereas Y and HREE are in garnet, and Sr and LREE in epidote and zoisite. Even though whole-rock ∑REE can be up to ca. 100 ppm, amphibole and clinopyroxene show REE contents ∑REE ca. 1–10 ppm) significantly lower than those of minerals with an igneous origin. Sr and LREE present large scattering atsingle-grain scale in minerals from eclogites. This contrasts with a more systematic trace-element distribution in high-P amphibolites.

Accordingly, electron microprobe analyses of epidote from foliated eclogites reveal the existence of micrometerscale irregular patches with very high Sr and LREE contents (ca. 2000 ppm La, 6000 ppm Ce and > 4000 ppm Sr) related to rutile inclusions. The data suggest that titanite, which could be an early Sr-LREE-rich mineral, could cause local Sr and LREE release when transformed to rutile during the eclogite-facies metamorphism, leading to the heterogeneous distribution of these trace elements in the rock matrix. The preservation of these fine-scale compositional heterogeneities provides evidence for limited mass transport during the eclogite-facies metamorphism, which differs from equilibrium observed in high-P amphibolites. Different fluid-transport scales may account for such trace-element behaviour.

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Keywords: ECLOGITE-FACIES METAMORPHISM; LA-ICP-MS; MAFIC ROCKS; MINERAL TRACE ELEMENTS; NEVADO-FILABRIDE COMPLEX

Document Type: Research Article

Publication date: 01 January 2003

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