Elsevier

Tectonophysics

Volume 637, 10 December 2014, Pages 305-327
Tectonophysics

States of paleostress north and south of the Periadriatic fault: Comparison of the Drau Range and the Friuli Southalpine wedge

https://doi.org/10.1016/j.tecto.2014.10.019Get rights and content
Under a Creative Commons license
open access

Highlights

  • Deformation stages on either side of the Periadriatic fault show large similarities.

  • Kinematic analyses of brittle fault datasets yield 5 successive tectonic regimes.

  • Small differences N vs. S of the principal stress axes (orientation) are visible.

  • A slight, but consistent CCW rotation of σ1 S of the fault is found.

  • σ1 N and S of the fault shows opposing plunge directions.

Abstract

This study focuses on the analysis of structures and kinematics of a N–S profile along the axis of maximum shortening of the European Eastern Alps. The area includes the southern Austroalpine unit in the north and the Southalpine unit, which is a part of the Adriatic indenter. The stratigraphically different units are separated by the Periadriatic fault, the major strike-slip fault within the Alps. In order to assess the kinematics of these units, mainly fault-slip data from north and south of the Periadriatic fault were analyzed. We distinguish a succession of five main kinematic groups in both units: (1) N–S compression; (2) NW–SE compression; (3) NE–SW compression, σ3 changes gradually from subvertical to subhorizontal; (4) N–S compression; and (5) NW–SE compression. Our study reveals that the deformation sequence on either sides of the PAF is similar. The mean orientations of the principal stress axes, however, show small, but consistent differences: The subhorizontal axes north of the Periadriatic fault plunge northward, in the south southward. A counterclockwise (CCW) rotation of the southern part in respect to the north is evident and in line with the well-known counterclockwise rotation of the Adriatic indenter as well as dextral displacement of the N-fanning stress-field along the Periadriatic fault. Opposing plunge directions are interpreted as a primary feature of the internal stress-field within an orogenic wedge further increased during ongoing compression.

Keywords

Paleostress analysis
Orogenic wedge
Drau Range
Periadriatic fault
Southern Alps
Adriatic indenter

Cited by (0)