Journal article
Nanoscale variations in 187Os isotopic composition and HSE systematics in a Bultfontein peridotite
AN Wainwright, A Luguet, A Schreiber, ROC Fonseca, GM Nowell, JP Lorand, R Wirth, PE Janney
Earth and Planetary Science Letters | ELSEVIER | Published : 2016
Abstract
Understanding the mineralogical controls on radiogenic chronometers is a fundamental aspect of all geochronological tools. As with other common dating tools, it has become increasingly clear that the Re-Os system can be impacted by multiple mineral formation events. The accessory and micrometric nature of the Re-Os-bearing minerals has made assessing this influence complex. This is especially evident in cratonic peridotites, where long residence times and multiple metasomatic events have created a complex melting and re-enrichment history. Here we investigate a harzburgitic peridotite from the Bultfontein kimberlite (South Africa) which contains sub-micron Pt-Fe-alloy inclusions within base ..
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Awarded by European Research Council
Funding Acknowledgements
A.L. thanks the European Research Council (ERC) for financially supporting this research (grant 258558 'Early Earth'). A.W. also thanks the ERC for support during the final stages of manuscript preparation (ERC research grant 336718 'ISoSyC'). This paper is number 26 of the LA-ICPMS Laboratory of the Steinmann Institute, University of Bonn. The authors would like to thank Sylvain Pont at the Institut de Mineralogie, de Physique des Materiaux et de Cosmochimie, Museum National d'Histoire Naturelle, Paris, France for his extensive help with the SEM-FEG as well as Judith Coggon, David van Acken, Christian Ballhaus, Rosalind Armytage and Alessandro Bragagni for discussion. The authors are grateful for reviews by Jose Maria Gonzalez Jimenez and an anonymous reviewer, as well as editorial handling by Bernard Marty.