Highly siderophile element abundances in Eoarchean komatiite and basalt protoliths

Original Paper

DOI: 10.1007/s00410-016-1243-y

Cite this article as:
Frank, E.A., Maier, W.D. & Mojzsis, S.J. Contrib Mineral Petrol (2016) 171: 29. doi:10.1007/s00410-016-1243-y

Abstract

Plume-derived, Mg-rich, volcanic rocks (komatiites, high-Mg basalts, and their metamorphic equivalents) can record secular changes in the highly siderophile element (HSE) abundances of mantle sources. An apparent secular time-dependent enrichment trend in HSE abundances from Paleoarchean to Paleoproterozoic mantle-derived rocks could represent the protracted homogenization of a Late Veneer chondritic contaminant into the pre-Late Veneer komatiite source. To search for a possible time dependence of a late accretion signature in the Eoarchean mantle, we report new data from rare >3700 Myr-old mafic and ultramafic schists locked in supracrustal belts from the Inukjuak domain (Québec, Canada) and the Akilia association (West Greenland). Our analysis shows that some of these experienced HSE mobility and/or include a cumulate component (Touboul et al. in Chem Geol 383:63–75, 2014), whereas several of the oldest samples show some of the most depleted HSE abundances measured for rocks of this composition. We consider these new data for the oldest documented rocks of komatiite protolith in light of the Late Veneer hypothesis.

Keywords

Late Veneer Komatiites Highly siderophile elements Platinum group elements Mantle evolution Eoarchean 

Supplementary material

410_2016_1243_MOESM1_ESM.xlsx (53 kb)
Supplementary material 1 (XLSX 53 kb)
410_2016_1243_MOESM2_ESM.xlsx (43 kb)
Supplementary material 2 (XLSX 42 kb)
410_2016_1243_MOESM3_ESM.xlsx (124 kb)
Supplementary material 3 (XLSX 123 kb)

Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  1. 1.Department of Geological Sciences, NASA Lunar Science Institute, Center for Lunar Origin and Evolution (CLOE)University of ColoradoBoulderUSA
  2. 2.School of Earth and Ocean SciencesCardiff UniversityCardiffUK
  3. 3.Institute for Geological and Geochemical ResearchHungarian Academy of SciencesBudapestHungary
  4. 4.Department of Terrestrial MagnetismCarnegie Institution of WashingtonWashingtonUSA

Personalised recommendations