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Geophysics

Hot fluids or rock in eclogite metamorphism? (Reply)

Nature volume 440, pages E4E5 (16 March 2006) | Download Citation

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Abstract

Bjørnerud and Austrheim1 interpret the geological evidence in the rocks of Holsnøy at Lindås nappe, Norway, to be inconsistent with our cold-crust model2, but do not question our new argon isotopic data, on which we base the thermal history of the terrain. A critical flaw underlying their arguments1,3 is the implicit assumption that element diffusion does not occur in dry environments, although there is clear evidence to the contrary2,4,5. Counter to earlier claims3,6 of element and isotope immobility in dry rocks, we have demonstrated the existence of diffusion profiles in phlogopite associated with the uptake of argon during the Caledonian in ‘unreacted’ protolith of the Lindås nappe. Diffusion has taken place in these dry rocks and cannot be ignored.

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Author information

Affiliations

  1. *Geological Sciences and Geological Engineering, Queen's University, Kingston, Ontario K7L 3N6, Canada camacho@geol.queensu.ca

    • Alfredo Camacho
    •  & James K. W
  2. †School of Biology, Earth and Environmental Sciences, University of New South Wales, Sydney, New South Wales 2052, Australia

    • Bastiaan-J. Hensen
  3. ‡Géosciences Rennes, CNRS UMR 6118, Université de Rennes 1, Rennes, CS 74205, France

    • Jean Braun

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DOI

https://doi.org/10.1038/nature04715

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