High pressure kinematics

The basement region in SW Norway called Western Gneiss Region contains high-strain zones (mylonite zones) with deformation fabrics suggesting top-to-W or sinistral movements, particularly in the coastal parts. This was the leading edge of the Baltica craton during the Caledonian collisional history, subducted and shortly after obducted in a Himalayan-style setting, making it a classical area for studies of high-P metamorphism of continental crust and extensional deformation/orogenic collapse. The high pressures are indicated by widespread occurrences of eclogite, locally with coesite and micro-diamonds. In the west it is terminated by the enormous extensional shear zone usually referred to as the Nordfjord Sogn detachment zone.

Here are some pictures of porphyroclast systems from high-T shear zones in the area that I photographed during field work this summer.


About Haakon Fossen

Professor of structural geology, University of Bergen. Author of book Structural Geology, published at Cambridge University Press
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4 Responses to High pressure kinematics

  1. Explorock says:

    It’s good to know that you are beginning to take a great look about geoblogs Professor Fossen, I have been staring at your photos in this site and it shocked to myself to know that there are an uncountless number of geo-stuffs to learn. Keep on going! Regards.

  2. Alan says:

    Congratulations Mr. Fossen for this blog. I’m very interested in structural geology and I enjoy your photos. Good examples of porphyroclasts like kinematics indicators. Regards

  3. Nice photos and nice text, also! Thanks!

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