on 05-11-201704:39 AM - edited on 11-09-202104:16 AM by usermigration2
1) Department of Geology, Juniata College, 1700 Moore St, Huntingdon, PA 16658, USA, 2) Department of Geosciences, University of Arizona, Tucson, AZ, USA, 3) Department of Geology, Washington State University, Pullman, WA, USA, 4) Carnegie Museum of Natural History, Pittsburgh, PA, USA, 5) Reeves and Davignon Coins, Huntingdon, PA, USA Journal of Archaeological Science (2009), V36(2), pp430–433, doi: 10.1016/j.jas.2008.09.029 The history of the United States cent revealed through copper isotope fractionation Ryan Mathur (1) Spencer Titley (2), Garret Hart (3), Marc Wilson (4), Michael Davignon (5), Caitlan Zlatos (1) Copper isotope fractionation in United States cents traces changes in the source of copper and identifies historical events. Application of copper isotopes as a geochemical tracer requires consistent isotopic signatures of the ores and refined metals. Overlapping isotopic signatures of crushed ores, chalcocite and refined metal extracted from Morenci, Arizona indicate modern mining processes that produce distinguishable single ore deposit geochemical signatures. The coincidence of copper isotope ratios in metals and ore deposits also exists within the United States cents analyzed here.