Experimental data on scaled analogue experiments modelling GPS velocity field variations and kinematic partitioning in the Southern Andes (34°S to 42°S)

The southern Andes are regarded as a typical subduction orogen formed by oblique plate convergence. Despite decades of studies, there is considerable uncertainty as to how deformation is kinematically partitioned in the upper plate. Using scaled analogue experiments modelling, we test the concept of dextral transpression for this orogen. We advocate that the GPS velocity field portrays interseismic deformation related to deformation of strong crust north, and weak crust south, of 37°S. Contrary to the popular hypotheses that the Liquiñe-Ofqui Fault Zone, a prominent intra-arc deformation zone, takes up most of the plate boundary-parallel dextral strike-slip, we find that dextral transpression affects the entire model orogen through tectonic segmentation of crust.

Moreover, prominent, regularly spaced sinistral oblique-slip thrust faults, interpreted as antithetic Riedel shears, developed spontaneously in all of our experiments and call into question the general believe that their NW-striking natural equivalents formed from pre-Andean discontinuities. Our experiments prompt us to reconsider the apparently well-established geodynamic concept that strain and margin-parallel displacement is localized on a few margin-parallel faults in the southern Andes.

Additional Info

Field Value
Source http://doi.org/doi:10.5880/fidgeo.2021.023
Author Eisermann, Jan Oliver (Universität Hamburg, Bundesstrasse 55, 20146 Hamburg, Germany), Göllner, Paul Leon (Universität Hamburg, Hamburg, Germany), Riller, Ulrich (Universität Hamburg, Bundesstrasse 55, 20146 Hamburg, Germany)
Provided by other-lab
Citation Eisermann, Jan Oliver, Göllner, Paul Leon, Riller, Ulrich (2021): GFZ Dataservices http://doi.org/doi:10.5880/fidgeo.2021.023
Created at repository 2021-04-20
Dataset contact Riller, Ulrich ( Universität Hamburg, Bundesstrasse 55, 20146 Hamburg, Germany Researcher ulrich.riller@uni-hamburg.de http://https://www.geo.uni-hamburg.de/geologie/personen/riller-ulrich.html informtion )
Is supplement to

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Publication date 2021-06-21
Publisher http://www.gfz-potsdam.de
geobox-eLong -68.4103
geobox-nLat -34.2115
geobox-sLat -42.1428
geobox-wLong -74.4747