Journal article

Titanates of the lindsleyite-mathiasite (LIMA) group reveal isotope disequilibrium associated with metasomatism in the mantle beneath Kimberley (South Africa)

Andrea Giuliani, Jon D Woodhead, David Phillips, Roland Maas, Gareth R Davies, William L Griffin

Earth and Planetary Science Letters | Elsevier | Published : 2018

Abstract

Radiogenic isotope variations unrelated to radiogenic ingrowth are common between minerals found in metasomatised mantle xenoliths entrained in kimberlite, basalts and related magmas. As the metasomatic minerals are assumed to have been in isotopic equilibrium originally, such variations are typically attributed to contamination by the magma host and/or interaction with mantle fluids during or before xenolith transport to surface. However, the increasing evidence of metasomatism by multiple, compositionally distinct fluids permeating the lithospheric mantle, coeval with specific magmatic events, suggests that isotopic disequilibrium might be a consequence of discrete, though complex, metasom..

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Grants

Awarded by Australian Research Council through DECRA award


Awarded by European Research Council under European Union's Seventh Framework Programme (ERC)


Funding Acknowledgements

We would like to thank Graham Hutchinson for support with the EMP analyses at the University of Melbourne, and the De Beers Group for providing access to the studied samples. We acknowledge constructive reviews from Richard Hinton and Steve Haggerty, and efficient editorial handling of Frederic Moynier. AG acknowledges funding from the Australian Research Council through a DECRA award (DE-150100009). GRD received funding from the European Research Council under the European Union's Seventh Framework Programme (FP7/2007-2013; ERC grant agreement n. 319209). This is contribution 1030 from the ARC Centre of Excellence for Core to Crust Fluid Systems (www.ccfs.mq.edu.au) and 1189 from the GEMOC Key Centre (www.gemoc.mq.edu.au).