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Continuous eclogite melting and variable refertilisation in upwelling heterogeneous mantle

Citation

Rosenthal, A and Yaxley, GM and Green, DH and Hermann, J and Kovacs, I and Spandler, C, Continuous eclogite melting and variable refertilisation in upwelling heterogeneous mantle, Scientific Reports, 4 Article 6099. ISSN 2045-2322 (2014) [Refereed Article]


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Copyright 2014 The Authors Licensed under a Creative Commons Attribution-NonCommercial- NoDerivatives 4.0 International(CC BY-NC-ND 4.0) http://creativecommons.org/licenses/by-nc-nd/4.0/

DOI: doi:10.1038/srep06099

Abstract

Large-scale tectonic processes introduce a range of crustal lithologies into the Earth’s mantle. These lithologies have been implicated as sources of compositional heterogeneity in mantle-derived magmas. The model being explored here assumes the presence of widely dispersed fragments of residual eclogite (derived from recycled oceanic crust), stretched and stirred by convection in the mantle. Here we show with an experimental study that these residual eclogites continuously melt during upwelling of such heterogeneous mantle and we characterize the melting reactions and compositional changes in the residue minerals. The chemical exchange between these partial melts and more refractory peridotite leads to a variably metasomatised mantle. Re-melting of these metasomatised peridotite lithologies at given pressures and temperatures results in diverse melt compositions, which may contribute to the observed heterogeneity of oceanic basalt suites. We also show that heterogeneous upwelling mantle is subject to diverse local freezing, hybridization and carbonate-carbon-silicate redox reactions along a mantle adiabat.

Item Details

Item Type:Refereed Article
Research Division:Earth Sciences
Research Group:Geology
Research Field:Igneous and Metamorphic Petrology
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Earth Sciences
Author:Green, DH (Professor David Green)
ID Code:98576
Year Published:2014
Web of Science® Times Cited:16
Deposited By:Earth Sciences
Deposited On:2015-02-19
Last Modified:2017-10-30
Downloads:221 View Download Statistics

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