2008/09/26 by Jonathan OʼNeil, Richard W. Carlson, D. Francis +1 · 7 citations
Earth and Planetary Sciences · Physics and Astronomy · #Geochemistry and Elemental Analysis #Geological and Geochemical Analysis #Astro and Planetary Science
paper · doi:10.1126/science.1161925
openalex publication_date 2008/09/26 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/23
Neodymium-142 data for rocks from the Nuvvuagittuq greenstone belt in northern Quebec, Canada, show that some rock types have lower 142 Nd/ 144 Nd ratios than the terrestrial standard (ϵ 142 Nd = –0.07 to –0.15). Within a mafic amphibolite unit, 142 Nd/ 144 Nd ratios correlate positively with Sm/Nd ratios and produce a 146 Sm- 142 Nd isochron with an age of \batchmode \documentclass[fleqn,10pt,legalpaper]article \usepackageamssymb \usepackageamsfonts \usepackageamsmath \pagestyleempty \begindocument \(4280-81+53\) \enddocument million years. These rocks thus sample incompatible-element-enriched material formed shortly after Earth formation and may represent the oldest preserved crustal section on Earth.