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Strain partitioning in host rock controls light rare earth element release from allanite-(Ce) in subduction zones

Published online by Cambridge University Press:  22 January 2020

Luca Corti Open the ORCID record for Luca Corti [Opens in a new window] ,
Davide Zanoni Open the ORCID record for Davide Zanoni [Opens in a new window] ,
G. Diego Gatta Open the ORCID record for G. Diego Gatta [Opens in a new window]  and
Michele Zucali Open the ORCID record for Michele Zucali [Opens in a new window]
Luca Corti*
Affiliation:
Università degli Studi di Milano, Dipartimento di Scienze della Terra “Ardito Desio”, Via Mangiagalli 34, 20133Milano, Italy
Davide Zanoni
Affiliation:
Università degli Studi di Milano, Dipartimento di Scienze della Terra “Ardito Desio”, Via Mangiagalli 34, 20133Milano, Italy
G. Diego Gatta
Affiliation:
Università degli Studi di Milano, Dipartimento di Scienze della Terra “Ardito Desio”, Via Mangiagalli 34, 20133Milano, Italy
Michele Zucali
Affiliation:
Università degli Studi di Milano, Dipartimento di Scienze della Terra “Ardito Desio”, Via Mangiagalli 34, 20133Milano, Italy University of Houston, Department of Earth and Atmospheric Sciences, 3507, Cullen Blvd, Houston, Texas, USA
*
*Author for correspondence: Luca Corti, Email: luca.corti@unimi.it
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Abstract

Combined microstructural, mineral chemical, X-ray maps and X-ray single-crystal diffraction analyses are used to reveal the behaviour of individual grains of magmatic allanite relicts hosted in variably deformed metagranitoids at Lago della Vecchia (inner part of the Sesia-Lanzo Zone, Western Alps, Europe), which experienced high-pressure and low-temperature metamorphism during the Alpine subduction. X-ray single-crystal diffraction shows that none of the allanite crystals, irrespective of the strain state of the host rock, record any evidence of plastic deformation (i.e. intracrystalline deformation), as indicated by the shape of the Bragg diffraction spots, the atomic site positions, and their displacement around the centre of gravity. On the contrary, strong plastic deformation affected matrix minerals, such as quartz, white mica and feldspar of the hosting rocks, during the development of the Alpine eclogitic- and blueschist-facies metamorphism. Despite the strain-free atomic structures of allanite, different patterns of chemical zoning, as a function of strain accumulated in the rock matrix, are observed. As allanite occurs in magmatic and metamorphic rocks and it is stable at high-pressure and low-temperature conditions, we infer that allanite could behave as one of the main carriers of light rare earth elements into the mantle wedge during subduction of continental crust. In particular, the release of light rare earth elements from allanite, under high-pressure conditions in subduction zones, is facilitated by high strain accumulated in the host rock.

Keywords

mineral rheologySesia-Lanzo Zonestrain partitioningsingle-crystal X-ray diffractionlight rare earth elements releasechemical imaging
Type
Article
Information
Mineralogical Magazine , Volume 84 , Issue 1 , February 2020 , pp. 93 - 108
Copyright
Copyright © Mineralogical Society of Great Britain and Ireland 2020

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Footnotes

Associate Editor: Edward Sturgis Grew

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