Interaction between thin- and thick-skinned tectonics in the foothill areas of an inverted graben. The Middle Magdalena Foothill
belt
Néstor Moreno
Alejandro Silva
Andrés Mora
Eliseo Tesón
Isaid Quintero
Luis Ernesto Rojas
Cristina Lopez
Vladimir Blanco
Jaime Castellanos
Javier Sanchez
Lidy Osorio
Jay Namson
Daniel Stockli
Wilson Casallas
10.6084/m9.figshare.3453377.v1
https://geolsoc.figshare.com/articles/journal_contribution/Interaction_between_thin-_and_thick-skinned_tectonics_in_the_foothill_areas_of_an_inverted_graben_The_Middle_Magdalena_Foothill___belt/3453377
<p>The Magdalena Valley fold-and-thrust belt is a tectonic province associated with inverted rift zones. This belt displays a
narrow and discontinuous deformation front indicating association with inversion tectonics. We show the differences with an
analogue belt on the eastern side of the Eastern Cordillera (Llanos foothills). To do that we use structural data (seismic,
wells and geological maps) which characterize different structural geometries as well as palaeocurrents, provenance and thermochronology
to analyse the timing of deformation. The new datasets allowed us to detect that inversion is limited whenever the stresses
are more orthogonal to the rift structures, whereas the mountain front is more segmented in comparison to the Eastern Foothills
because of the absence of a continuous low basal friction detachment horizon and a pronounced eastwards basement dip. These
two factors favoured fault hard linkage. It is remarkable that, in spite of the distinct segmentation, all the different segments
in the Magdalena belt are coeval.
</p>
2016-06-21 11:21:53
deformation front
inversion tectonics
rift zones
foothill areas
mountain front
belt displays
analogue belt
factors favoured fault
Eastern Cordillera
Middle Magdalena Foothill belt
Llanos foothills
tectonic province
basal friction detachment horizon
rift structures
Magdalena belt
eastwards basement dip
Eastern Foothills
Geology