Continuous eclogite melting and variable refertilisation in upwelling heterogeneous mantle

Anja Rosenthal, Gregory M. Yaxley, David H. Green, Joerg Hermann, I. Kovács, Carl Spandler

Research output: Contribution to journalArticle

32 Citations (Scopus)

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.

Original languageEnglish
Article number6099
JournalScientific Reports
Volume4
DOIs
Publication statusPublished - Aug 18 2014

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eclogite
upwelling
melting
mantle
lithology
melt
peridotite
oceanic crust
freezing
experimental study
silicate
basalt
convection
carbonate
tectonics
carbon
mineral
temperature

ASJC Scopus subject areas

  • General

Cite this

Continuous eclogite melting and variable refertilisation in upwelling heterogeneous mantle. / Rosenthal, Anja; Yaxley, Gregory M.; Green, David H.; Hermann, Joerg; Kovács, I.; Spandler, Carl.

In: Scientific Reports, Vol. 4, 6099, 18.08.2014.

Research output: Contribution to journalArticle

Rosenthal, Anja ; Yaxley, Gregory M. ; Green, David H. ; Hermann, Joerg ; Kovács, I. ; Spandler, Carl. / Continuous eclogite melting and variable refertilisation in upwelling heterogeneous mantle. In: Scientific Reports. 2014 ; Vol. 4.
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