Continuous eclogite melting and variable refertilisation in upwelling heterogeneous mantle

Rosenthal, Anja; Yaxley, Gregory M.; Green, David H.; Hermann, Jörg; Kovács, István; Spandler, Carl (2014). Continuous eclogite melting and variable refertilisation in upwelling heterogeneous mantle. Scientific Reports, 4, p. 6099. Nature Publishing Group 10.1038/srep06099

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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 Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geological Sciences

UniBE Contributor:

Hermann, Jörg and Spandler, Carl

Subjects:

500 Science > 550 Earth sciences & geology

ISSN:

2045-2322

Publisher:

Nature Publishing Group

Language:

English

Submitter:

Sarah Antenen

Date Deposited:

10 Aug 2015 10:37

Last Modified:

01 Mar 2016 13:20

Publisher DOI:

10.1038/srep06099

PubMed ID:

25130275

BORIS DOI:

10.7892/boris.70744

URI:

https://boris.unibe.ch/id/eprint/70744

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