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VERA Seminar

From supernova to terrestrial dirt: a journey between astrophysics, biology, and geophysics

Ramon Egli, ZAMG – Zentralanstalt fuer Meteorologie und Geodynamik, Wien


Search for 60Fe from supernova explosions in terrestrial materials requires careful selection of sites where extraterrestrial Fe is continuously accumulated with minimum dilution by terrestrial inputs. 60Fe atoms have been found in layers of a deep-sea ferromanganese crust dated 1.8-2.8 Myr BP [1], while no 60Fe has been found in deep-sea sediment from the North Atlantic [2]. This talk illustrates our current understanding of the global Fe-cycle on Earth and possible 60Fe pathways to stable sedimentary records, with special focus on the selection of Equatorial Pacific pelagic carbonates, where the sedimentary Fe cycle is significantly influenced by the iron uptake of so-called magnetotactic bacteria. These carbonates are currently investigated for their 60Fe content.

[1] Knie et al., Phys. Rev. Lett. 93, 171103 (2004).
[2] Fitoussi et al., Phys. Rev. Lett. 101, 121101 (2008).


Donnerstag, 09.10.2014    16:30 Uhr

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