1. In situ cosmogenic 53Mn production rate from ancient low-denudation surface in tropic Brazil
- Author
-
Fujioka, T., Fifield, L.K., Stone, J.O., Vasconcelos, P.M., Tims, S.G., and Chappell, J.
- Subjects
- *
COSMOGENIC nuclides , *MANGANESE isotopes , *CHEMICAL denudation , *HEMATITE , *COSMIC rays , *SEA level , *RADIOACTIVE dating - Abstract
Abstract: Preliminary results of 53Mn measurements for seven Brazilian haematites are presented. The production rate of 53Mn due to cosmic-ray induced disintegration of iron is estimated to be 103±19 atoms g(Fe)-1 yr−1 at sea level and high latitude. This is consistent with the only previously published measurement. The muon contribution to the total 53Mn production at the surface is estimated to be ∼7%. Cosmogenic-isotope dating employing 53Mn is applicable to any rock/mineral type that contains iron as a major constituent, such as haematite, goethite, pyroxene and olivine. The method has the potential to extend the time scale of cosmogenic exposure dating to >10Ma. [Copyright &y& Elsevier]
- Published
- 2010
- Full Text
- View/download PDF