Friday, 9 September 2005 - 9:10 AM

This presentation is part of: New Developments in Terrestrial Cosmogenic Nuclide Research

53Mn in rocks: a new isotope for cosmogenic nuclide studies

Klaus Knie1, Thomas Faestermann1, Gregory F. Herzog2, Gunther Korschinek1, Jozef Masarik3, Mikhail Poutivtsev1, Georg Rugel1, Jörg M. Schäfer4, and Feride Serefiddin2. (1) Fakultät für Physik, Technische Universität München, Garching, D-85748, Germany, (2) Department of Chemistry, Rutgers University, Piscataway, NJ, (3) Dept. Nucl. Physics, Komensky University, Bratislava, SK-842 15, Slovak Republic, (4) Lamont-Doherty Earth Observatory, Palisades, NY

We report first successful measurements of in-situ cosmogenic 53Mn in terrestrial samples. The samples origin from Antarctic Dry Valleys and Tibet. Comparing the 53Mn data with cosmogenic 3He data from the same rocks allows the determination of a production rate of 53Mn from iron, the only target element of relevance in terrestrial applications. This study makes terrestrial 53Mn available as a tool for quantification of earth surface processes, including surface exposure dating and burial dating. For 53Mn analyses whole rock samples can be processed, and, due to the half-life of 3.7 My, this nuclide yields information over long time-scales.

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