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Postglacial Matrix Diffusion in a Boulder Sample

Published online by Cambridge University Press:  15 February 2011

K. Rasilainen,
J. Suksi,
K.-H. Hellmuth,
A. Lindberg and
S. Kulmala
K. Rasilainen
Affiliation:
VTI Energy, P.O. Box 1604, FIN-02044 VTT, Finland
J. Suksi
Affiliation:
University of Helsinki, P.O. Box 55, FIN-00014 HELSINKI UNIVERSITY, Finland
K.-H. Hellmuth
Affiliation:
Finnish Centre for Radiation and Nuclear Safety, P.O. Box 14, FIN-00881 HELSINKI, Finland
A. Lindberg
Affiliation:
Geological Survey of Finland, Kivimiehentie 1, FIN-02150 ESPOO, Finland
S. Kulmala
Affiliation:
University of Helsinki, P.O. Box 55, FIN-00014 HELSINKI UNIVERSITY, Finland
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Abstract

A boulder sample was studied for its unusual U content. Analyses of U-series nuclides within the rock matrix perpendicular to an assumed fracture face show abrupt pulse-like concentration distributions with very low concentrations of U daughters. Both Th-230/U-234 and Pa-231/U-235 activity ratios are low, indicating recent U accumulation into the rock. Matrix diffusion is tested as a possible cause for the experimental observations. We assume that the diffusion process was triggered and controlled by rock expansion, strong mixing of different water types and rapid land uplift at the end phase of the last glaciation.

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