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- W2989179910 abstract "Abstract Mantle melts provide a window on processes related to global plate tectonics. The composition of chromian spinel (Cr-spinel) from mafic-ultramafic rocks has been widely used for tracing the geotectonic environments, the degree of mantle melting and the rate of mid-ocean ridge spreading. The assumption is that Cr-spinel’s core composition (Cr# = Cr/(Cr + Al)) is homogenous, insensitive to post-formation modification and therefore a robust petrogenetic indicator. However, we demonstrate that the composition of Cr-spinel can be modified by fluid/melt-rock interactions in both sub-arc and sub-mid oceanic mantle. Metasomatism can produce Al-Cr heterogeneity in Cr-spinel that lowers the Cr/Al ratio, and therefore modifies the Cr#, making Cr# ineffective as a geotectonic and mantle melting indicator. Our analysis also demonstrates that Cr-spinel is a potential sink for fluid-mobile elements, especially in subduction zone environments. The heterogeneity of Cr# in Cr-spinel can, therefore, be used as an excellent tracer for metasomatic processes." @default.
- W2989179910 created "2019-11-22" @default.
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- W2989179910 date "2019-11-08" @default.
- W2989179910 modified "2023-10-09" @default.
- W2989179910 title "Cr-spinel records metasomatism not petrogenesis of mantle rocks" @default.
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- W2989179910 doi "https://doi.org/10.1038/s41467-019-13117-1" @default.
- W2989179910 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6841941" @default.
- W2989179910 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/31704918" @default.
- W2989179910 hasPublicationYear "2019" @default.
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