Transpressional collision structures in the upper crust: the fold-thrust belt of the Northern Calcareous Alps

Transpressional collision structures in the upper crust: the fold-thrust belt of the Northern... Two major structural events characterize the tectonic evolution of the Northern Calcareous Alps (NCA): (1) late-Early Cretaceous to Late Eocene NW-directed, dextral-transpressional stacking of nappes as an expression of the formation of the Austroalpine orogenic wedge; and (2) Miocene sinistral wrenching due to eastward lateral extrusion of crustal wedges along the central Eastern Alps. Three first-order detachment horizons are defined by differences of competence within areas of facies transition. Preexisting normal faults control the thrust architecture. Transpressional contraction in the NCA is indicated by: (a) NW-directed thrusting, oblique to both the long axis of the NCA and the edge of the orogenic foreland; (b) the occurrence of en-échelon arrays of thrusts and folds laterally displaced by dextral strike-slip faults; the thrusts and strike-slip faults are kinematically connected to each other and dissect the NCA into rhomboidal blocks; (c) NE-directed extension parallel to fold and ramp axes and the internal strike of the NCA; and (d) clockwise rotation (⩾ 30°) of the entire NCA around a vertical axis. Kinematic and dynamic analysis of mesoscale fault-striae data related to transpressional stacking indicates a NW-trend of contraction directions and, in general, a NE-trend of the extension directions, parallel to fold axes and branch lines of thrusts. Before rotation, the average contraction direction was probably parallel to the generally W-directed shear direction recorded in the crystal-plastically deformed central part of the Eastern Alps. Three balanced cross-sections across the NCA yield a minimum of 54–65% total shortening. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Tectonophysics Elsevier

Transpressional collision structures in the upper crust: the fold-thrust belt of the Northern Calcareous Alps

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Publisher
Elsevier
Copyright
Copyright © 1995 Elsevier Ltd
ISSN
0040-1951
eISSN
1879-3266
DOI
10.1016/0040-1951(94)00152-Y
Publisher site
See Article on Publisher Site

Abstract

Two major structural events characterize the tectonic evolution of the Northern Calcareous Alps (NCA): (1) late-Early Cretaceous to Late Eocene NW-directed, dextral-transpressional stacking of nappes as an expression of the formation of the Austroalpine orogenic wedge; and (2) Miocene sinistral wrenching due to eastward lateral extrusion of crustal wedges along the central Eastern Alps. Three first-order detachment horizons are defined by differences of competence within areas of facies transition. Preexisting normal faults control the thrust architecture. Transpressional contraction in the NCA is indicated by: (a) NW-directed thrusting, oblique to both the long axis of the NCA and the edge of the orogenic foreland; (b) the occurrence of en-échelon arrays of thrusts and folds laterally displaced by dextral strike-slip faults; the thrusts and strike-slip faults are kinematically connected to each other and dissect the NCA into rhomboidal blocks; (c) NE-directed extension parallel to fold and ramp axes and the internal strike of the NCA; and (d) clockwise rotation (⩾ 30°) of the entire NCA around a vertical axis. Kinematic and dynamic analysis of mesoscale fault-striae data related to transpressional stacking indicates a NW-trend of contraction directions and, in general, a NE-trend of the extension directions, parallel to fold axes and branch lines of thrusts. Before rotation, the average contraction direction was probably parallel to the generally W-directed shear direction recorded in the crystal-plastically deformed central part of the Eastern Alps. Three balanced cross-sections across the NCA yield a minimum of 54–65% total shortening.

Journal

TectonophysicsElsevier

Published: Feb 15, 1995

References

  • Paleomagnetism and paleogeography of the Northern Calcareous Alps (Austria)
    Channell, J.E.T.; Brandner, R.; Spieler, A.; Stoner, J.S.
  • Transition from near surface thrusting to intrabasement decollement, Schlinig thrust, eastern Alps
    Schmid, S.M.; Haas, R.
  • Subduction tectonic erosion and Late Cretaceous subsidence along the northern Austroalpine margin (Eastern Alps, Austria)
    Wagreich, M.

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