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Nature 435, 1171 (30 June 2005) | doi:10.1038/4351171a; Published online 29 June 2005

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Geophysics:  Hot fluids and cold crusts

Simon Kelley1

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Conventional wisdom says that changes to crustal rocks pushed down deep when continents collide develop over millions of years. But it seems that some metamorphism may be caused by tectonic events lasting only a decade.

The Bergen Arcs in Norway are famous for rare and rather beautiful rocks known as eclogites. Striking, coarse-grained, and characterized by large pink garnets and a green matrix rich in silicates known as pyroxene (Fig. 1

  1. Simon Kelley is in the Department of Earth Sciences, Open University, Walton Hall, Milton Keynes, Buckinghamshire MK7 6AA, UK.
    Email: S.P.Kelley@open.ac.uk

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