A bit strange boudinage

 

This is from Bergen Area. A boudinage in banded gneiss. The orange inclusions between the individual boudins is calcite. There is a nice relationship between the height of the boudins and the width of them.

The unusual thing here (at least for me) is the multiple layers involved in each boudin. Usually boudinage is characteristic to extensional regimes where relatively stonger layer is surrounded by weaker matrix. Break or deform the stiffer layer and you will get the boudins. But then, how does the boudins form here? Why does the layers with different viscosities break in the same place?

I would be interested in any comments on this.

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2 Responses to A bit strange boudinage

  1. Amitava Kundu says:

    Please see the article Journal of Structural Geology

    Volume 30, Issue 3, March 2008, Pages 291–309

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