Continuous eclogite melting and variable refertilisation in upwelling heterogeneous mantle

Rosenthal, Anja, Yaxley, Greg M., Green, David H., Hermann, Joerg, Kovács, István, and Spandler, Carl (2014) Continuous eclogite melting and variable refertilisation in upwelling heterogeneous mantle. Scientific Reports, 4. 6099. pp. 1-6.

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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 ID: 34702
Item Type: Article (Research - C1)
ISSN: 2045-2322
Keywords: climate and Earth system modelling; geochemistry; petrology; volcanology
Additional Information:

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder in order to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-nd/4.0/

Funders: Australian Research Council (ARC), Australian National University (ANU), Mervyn & Katalyn Paterson Fellowship, Marie Curie International, Ringwood Memorial Scholarship, Australian International Postgraduate Research Scholarship, Bolyai Fellowship Program, Hungarian Scientific Research Fund
Projects and Grants: ARC Discovery grant, Marie Curie International Incoming Fellowship 302637, Marie Curie International Reintegration Grant NAMS-230937, Hungarian Scientific Research Fund OTKA PD101683
Date Deposited: 27 Aug 2014 02:34
FoR Codes: 04 EARTH SCIENCES > 0403 Geology > 040304 Igneous and Metamorphic Petrology @ 50%
04 EARTH SCIENCES > 0402 Geochemistry > 040202 Inorganic Geochemistry @ 50%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970104 Expanding Knowledge in the Earth Sciences @ 100%
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