Journal article

The role of lithospheric heterogeneity on the composition of kimberlite magmas from a single field: The case of Kaavi-Kuopio, Finland

Hayden Dalton, Andrea Giuliani, Hugh O'Brien, David Phillips, Janet Hergt

LITHOS | ELSEVIER | Published : 2020

Abstract

Kimberlites are complex, ‘hybrid’ igneous rocks because their parental magmas entrain abundant crust- and mantle-derived components that can be readily assimilated during ascent to surface. Recent studies of olivine zonation patterns have shown compositional relationships between xenocrystic cores and magmatic rims, suggesting that kimberlite melt compositions might be controlled by assimilation of mantle material during emplacement. However, the nature and extent to which this process, as well as assimilation of crustal material, influences melt compositions within single kimberlite fields remains unclear. To address this issue, we have conducted a comprehensive geochemical and petrographic..

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Grants

Awarded by Australian Research Council (ARC) Discovery Early Career Researcher Award (DECRA)


Awarded by Swiss National Science Foundation (SNSF) Ambizione fellowship


Funding Acknowledgements

This work was supported by an Australian Research Training Program PhD Scholarship and Geological Society of Australia Victoria Division student award to HD, an Australian Research Council (ARC) Discovery Early Career Researcher Award (DECRA) (grant no. DE-1501000009) and a Swiss National Science Foundation (SNSF) Ambizione fellowship (n. PZOOP2_180126/1) to AG. We would like to thank the Geological Survey of Finland (GTK) for providing access to their drill -core storage facility and making this project possible. We thank Graham Hutchinson for his analytical help during SEM and EPMA sessions and Alan Greig for assistance with whole-rock dissolution and ICP-MS analyses. Michael Heath at the University of Melbourne and Lloyd White at the University of Wollongong are thanked for assistance with XRF analyses. We would also like to thank Angus Fitzpayne of the Kimberlites and Diamonds Research Group for informal reviews on earlier versions of this manuscript. HD is grateful to Morgan Williams at CSIRO for his assistance with implementation of the pyrolite package to produce density plots. We are thankful for two positive and constructive reviews from Gerhard Brey and Sebastian Tappe, and the editorial handling of Alan Woodland, which improved the final manuscript. This is publication 50 from the Kimberlites and Diamonds Research Group at the University of Melbourne (http://kimberlitesdiamonds.org/).