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Fig. 8.19 Late Alpine
deformation of Austrian
crystalline north of Pusteria
Lineament. Transition from
northward overturned folds
approximately along
TRANSALP profile into the
Defereggen “Schlinge” with
sinistral vergency (Source:
Agterberg 1961 , Fig. 104)
8.2.7 Defereggen Schlinge Example
Significant Alpine compression of the crystalline basement of the Dolomites in
northern Italy was shown to have taken place, probably during the Miocene. On a
larger scale this involved a 70 km northward displacement of the Dolomites along
the Giudicaria Line. It is likely that crystalline rocks north of the Periadriatic
Lineament in this area were involved in this late Alpine displacement as well.
Crystalline rocks in the Defereggen and ¨ rtler regions of the Eastern Alps in
Austria show “Schlinge”-like structures. Schmidegg ( 1933 , 1936 ) introduced the
term “Schlinge” (
sinuosity) for folds with subvertical axes occurring in the
infrastructure of katazonal gneisses. They would have formed by bending of
subvertical S-planes in consequence of subhorizontal compression. It is generally
assumed that the Schlingen are Variscan (Hercynian) in age (see, e.g., Schulz
et al. 2008 ). However, Agterberg ( 1961 ) argued that they originated near the end
of the Alpine orogeny (Fig. 8.19 ) in conjunction with the sinistral movement along
the Giudicaria Fault.
¼
References
Agterberg FP (1959) On the measuring of strongly dispersed minor folds. Geol Mijnb 21:133-137
Agterberg FP (1961) Tectonics of the crystalline basement of the Dolomites in North Italy.
Kemink, Utrecht
Agterberg FP (1974) Geomathematics. Elsevier, Amsterdam
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