Portuguese boudins and folds

I visited Spain and SW Portugal last week and couldn’t resist a short visit to the folded and boudinaged Carboniferous turbidites near Almograve, SW Portugal. Chocolate boudinage structures are not allthat common, but here there are a few superb examples right on the beach. Chocolate boudinage implies uniform flattening, with extension along both X and Y strain axes (Figure 14.17a in my textbook). Brittle and ductile: The boudinage is primarily a brittle process, as portrayed by quartz-filled fractures (white), while the folding is ductile (although very low temperature, probably <300 C). What a beautiful area to study cleavage formation, folding, fracturing and boudinage! See Reber et al. (Tectonoph. 2010, v 493, 187-195) and Marques (Tectonics 2010) for more information.



About Haakon Fossen

Professor of structural geology, University of Bergen. Author of book Structural Geology, published at Cambridge University Press
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