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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 that kimberlite melts with highly variable composition were broadly similar before lithosphere assimilation. This implies that kimberlites worldwide originated by partial melting of compositionally similar convective mantle sources under comparable physical conditions. We conclude that mantle assimilation markedly alters the major element composition of carbonate-rich melts and is a major process in the evolution of mantle-derived magmas.
Original language | English |
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Article number | eaaz0424 |
Pages (from-to) | 1-9 |
Number of pages | 9 |
Journal | Science Advances |
Volume | 6 |
Issue number | 17 |
DOIs | |
Publication status | Published - 24 Apr 2020 |
Bibliographical note
Copyright the Author(s) 2020. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.Fingerprint
Dive into the research topics of 'Kimberlite genesis from a common carbonate-rich primary melt modified by lithospheric mantle assimilation'. Together they form a unique fingerprint.Projects
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A new approach to revealing melting processes in the hidden deep Earth
Giuliani, A. & O'Reilly, S.
22/06/15 → …
Project: Research