Field studies encounter several complicating factors not studied in the models. Examples are oblique convergence, heterogeneous materials and thermal softening by intruding magmas. Within the deeply eroded Svecokarelian orogeny, studies in eastern Bergslagen indicate strain accommodation of the N-S orogenic shortening by regional E-W folding and shear along the conjugate Singö Shear Zone and Ornö Banded Series. Rising temperature resulted in migmatites affecting the strain accommodation resulting in decoupling and rotation of folds along one of the deformation zones. Deformation zones developed in convergent orogens have been studied in both analogue models and in nature. These studies have focused on a number of important factors controlling strain accommodation during orogenesis. The models show that the shape of the leading edge of the indenting continent controls whether the initial suture remains active or if an effective indenter develops, the spacing and number of faults, the width of the orogen and the height of the mountains…
Contents
1. Introduction
2. Episodicity in orogenic growth, erosion and sedimentation
2.1 Analogue models – previous work
2.2 Analogue modeling: set-up and procedure
2.3 Effects of varying indenter shape (Paper I)
2.4 Comparisons with natural orogens (Paper I)
2.5 Symmetric erosion and sedimentation (Paper II)
2.6 River erosion and transport – an integrated analogue-numerical approach (Paper III)
2.7 A few conclusions drawn from analogue models of orogenic wedges
3. Deformation zones in eastern Bergslagen
3.1 The Svecokarelian orogeny
3.2 The Bergslagen arc and the Sörmland Basin
3.3 Late-orogenic progressive shearing in northeastern Bergslagen(Paper IV)
3.4 Shear and fold accommodated convergence in southeastern
Bergslagen (Paper V)
4. Deformation zones in models and nature – a summary
Acknowledgements
References
Author: Persson, Katarina Sofia
Source: Uppsala University Library
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