Geological Engineering Commons^™

Early Global Mantle Chemical And Isotope Heterogeneity Revealed By The Komatiite-Basalt Record: The Western Australia Connection, I. S. Puchtel, R. W. Nicklas, J. Slagle, M. Horan, R. J. Walker, E. G. Nisbet, Marek Locmelis

Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works

Although the heterogeneous nature of the chemical composition of Earth's mantle is now well established, the origin and longevity of the heterogeneities continue to be debated. In order to further study early-Earth heterogeneities, we present a set of Sm-Nd, Lu-Hf, Re-Os, and Hf-W isotope and lithophile and siderophile element abundance data for komatiites and basalts from the ∼3.53 Ga Coonterunah, ∼3.34 Ga Kelly, and ∼3.18 Ga Ruth Well and Regal systems of the Pilbara Craton in Western Australia. The Sm-Nd, Lu-Hf, and Re-Os isotope data yield isochrons consistent with the accepted emplacement ages of the respective komatiite-basalt lavas. The mantle …