Bennett, VictoriaBrandon, Alan DNutman, Allen P2015-12-070036-8075http://hdl.handle.net/1885/26972The oldest rocks - 3.85 billion years old - from southwest Greenland have coupled neodymium-142 excesses (from decay of now-extinct samarium-146; half-life, 103 million years) and neodymium-143 excesses (from decay of samarium-147; half-life, 106 billionKeywords: isotope; neodymium; neodymium 142; neodymium 143; samarium; unclassified drug; chondrite; Hadean; heterogeneity; mantle chemistry; neodymium; silicate; temporal variation; article; astronomy; Australia; dynamics; geochemistry; Greenland; half life time; m200710.1126/science.11459282015-12-07