Berlin 2014 – scientific programme

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MS: Fachverband Massenspektrometrie

MS 9: Accelerator Mass Spectrometry and Applications 2

MS 9.3: Talk

Thursday, March 20, 2014, 14:45–15:00, DO24 1.205

Search for supernova-produced ⁶⁰Fe in the microfossil record — •Peter Ludwig¹, Shawn Bishop¹, Ramon Egli², Valentyna Chernenko¹, Thomas Faestermann¹, Nicolai Famulok¹, Leticia Fimiani¹, Thomas Frederichs³, Jose Gomez¹, Karin Hain¹, Marianne Hanzlik⁴, Gunther Korschinek¹, Silke Merchel⁵, and Georg Rugel⁵ — ¹TU München, Physik Department — ²ZAMG, Wien — ³Universität Bremen, Geowissenschaften — ⁴TU München, Fakultät für Chemie — ⁵HZDR, Dresden

Material distributed into the interstellar medium by supernova explosions can be incorporated into terrestrial archives. After the discovery of live ⁶⁰Fe atoms in 2-3 Myr old layers of a Pacific Ocean ferromanganese crust (Knie et al., PRL 93, 171103 (2004)), a confirmation of this signal, as well as a mapping of the signal with high time-resolution is desireable. Another reservoir in which the ⁶⁰Fe signature should have been incorporated are the fossils of magnetotactic bacteria in ocean sediment. To this end, two sediment cores from the Eastern Equatorial Pacific were obtained, iron was chemically extracted with high selectivity towards biogenic magnetite, and the extraction procedure was characterized using novel magnetic measurements. The ⁶⁰Fe/Fe concentration in the samples was then measured with accelerator mass spectrometry at the GAMS setup in Garching. Preliminary results for both sediment cores will be reported.