Journal article

Kimberlite genesis from a common carbonate-rich primary melt modified by lithospheric mantle assimilation

Andrea Giuliani, D Graham Pearson, Ashton Soltys, Hayden Dalton, David Phillips, Stephen F Foley, Emilie Lim, Karsten Goemann, William L Griffin, Roger H Mitchell

Science Advances | AMER ASSOC ADVANCEMENT SCIENCE | Published : 2020

Abstract

Quantifying the compositional evolution of mantle-derived melts from source to surface is fundamental for constraining the nature of primary melts and deep Earth composition. Despite abundant evidence for interaction between carbonate-rich melts, including diamondiferous kimberlites, and mantle wall rocks en route to surface, the effects of this interaction on melt compositions are poorly constrained. Here, we demonstrate a robust linear correlation between the Mg/Si ratios of kimberlites and their entrained mantle components and between Mg/Fe ratios of mantle-derived olivine cores and magmatic olivine rims in kimberlites worldwide. Combined with numerical modeling, these findings indicate t..

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Grants

Awarded by Australian Research Council (DECRA)


Awarded by Swiss National Science Foundation


Funding Acknowledgements

This research was funded by the Australian Research Council (DECRA grant no. DE-150100510) and the Swiss National Science Foundation (Ambizione fellowship no. PZ00P2_180126/1).