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No direct contribution of recycled crust in Icelandic basalts

Lambart, Sarah 2017. No direct contribution of recycled crust in Icelandic basalts. Geochemical Perspectives Letters 4 , pp. 7-12. 10.7185/geochemlet.1728

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Abstract

Using Melt-PX to model the decompression melting of a heterogeneous mantle, I investigated the role of major-element composition of the lithologies present in the source on magmatic productivity, and trace element and isotopic melt compositions, independently of the bulk mantle composition. My calculations demonstrate that the volume of magma produced is not significantly affected by the nature of the lithological heterogeneity, but depends on the bulk mantle composition. However, an isochemical bulk mantle can produce contrasting trace element and isotopic melt compositions depending on the major-element compositions of the lithologies present in the source. Results show that the observed crust thickness of the Icelandic rift zones is consistent with about 10 % of recycled crust in the source, but also demonstrate there is no need to involve the contribution of melts derived from a recycled basalt component to explain the compositional variability of the Icelandic basalts in rift zones, and rather advance the contribution of olivine-bearing hybrid lithologies formed by solid-state reactions between the recycled crust and the peridotite.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Subjects: Q Science > QE Geology
Funders: National Science Foundation grant EAR-1551442, European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No. 663830
Date of First Compliant Deposit: 14 November 2017
Date of Acceptance: 6 June 2017
Last Modified: 14 Nov 2017 14:22
URI: http://orca.cf.ac.uk/id/eprint/106425

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