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
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..View full abstract
Awarded by Australian Research Council (DECRA)
Awarded by Swiss National Science Foundation
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).