The composition of peridotite tectonites from the Ivrea Complex, northern Italy: Residues from melt extraction

doi:10.1016/0016-7037(93)90112-A

Geochimica et Cosmochimica Acta

Volume 57, Issue 8, April 1993, Pages 1761-1782

https://doi.org/10.1016/0016-7037(93)90112-A Get rights and content

Abstract

A total of forty-three samples from the Balmuccia, Baldissero, and Finero peridotite tectonites have been analyzed for major elements, forty minor elements, mineral composition, and a subset of samples have been investigated for δD, δ¹⁸O, δ³⁴S, and ⁸⁷Sr/⁸⁶Sr ratios.

The spinel Iherzolites from Balmuccia and Baldissero contain on average 56% olivine, 28% orthopyroxene, 14% clinopyroxene, and 1.5% spinel. They have a neodymium and strontium isotopic signature similar to MORB. These peridotites were moderately depleted in Al and Ca and highly depleted in incompatible elements by the separation of 4.5% P-MORB. The MORB in excess to the formation and subduction of the oceanic crust fractionated into a tonalitic continental crust and a pyroxenitic residue which was recycled into the mantle. The crustal mass fraction of the upper mantle-crust system is 2.8%. A primitive mantle composition can be calculated from 97.2% Balmuccia model peridotite plus 2.8% bulk crust. The new set of primitive mantle concentrations is in accordance, within about 10%, with the data from fertile peridotite xenoliths and primitive meteorites for the elements Li, Mg, Si, Ca, Sc, V, Mn, Fe, Co, Ni, Zn, Ga, Y, Zr, La, Ce, Nd, Eu, Tb, Dy, Yb, Lu, and Hf. Larger differences occur for the elements F, Na, P, Ti, Cr, and Cu. The bulk crust concentrations of the highly incompatible and mobile elements K, Rb, Ba, Th, and U exceed those being supplied from a primitive upper mantle reservoir of 660 km depth. An additional lower mantle source is required for about half of the crustal accumulation of these elements. Moderately depleted peridotite bodies with a cross section of 3 km can be sufficiently well homogenized in compatible and moderately incompatible elements to represent MORB producing upper mantle. Concentrations of Na, Sc, Ti, V, Ga, Y, Zr, and Yb are well correlated with the Al abundance so that primitive mantle values can also be estimated using the cosmically derived primordial Al concentration.

The spinel harzburgites from Finero contain on average 74% olivine, 16% orthopyroxene, 3% clinopyroxene, 5% amphibole, 1% phlogopite, and 1% spinel. These peridotites were depleted by a separation of about 18% MORB. Subsequently they have undergone metasomatic alteration probably from dehydration of a subducted lithospheric slab. They received two pulses of water-rich fluids at temperatures of about 800°C to form amphibole low in incompatible elements or amphibole plus phlogopite high in incompatible elements without complete reequilibration of the preexisting rocks. The accumulation of elements is correlated to their incompatibility with the exception of a depletion of U, Th, Nb, and Ti. Isotopic ratios of H, O, S, Sr, Nd, and Pb, chlorine in phlogopite and a relative deficit of Nb and Ti are consistent with a crustal imprint in the metasomatic fluids.

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Citation Excerpt :
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ArticleThe composition of peridotite tectonites from the Ivrea Complex, northern Italy: Residues from melt extraction

Abstract

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Article
The composition of peridotite tectonites from the Ivrea Complex, northern Italy: Residues from melt extraction