Basement control on oblique thrust sheet evolution: seismic imaging of the active deformation front of the Central Andes in Bolivia

Hinsch, Ralph; Krawczyk, Charlotte M.; Gaedicke, Christoph; Giraudo, Raul; Demuro, Daniel

doi:10.1016/s0040-1951(02)00132-4

Cited by 13 publications

(9 citation statements)

References 27 publications

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“…Accordingly, the Guaicaramo thrust sheet grew during the Pliocene from a Cretaceous and Ceno zoic depocenter toward areas where the basin fi ll progressively tapers to the SW and SE, without any inherited bounding structure in that direction. Boyer (1995) and Hinsch et al (2002) documented that the higher taper angle along the hindward dip of such a sedimentary sequence is a fundamental element that determines the width of a deformation front. Higher taper angles favor a migration of the deformation toward the foreland (Boyer, 1995), whereas lower taper angles favor internal deformation in order to build an orogenic wedge before migrations starts.…”

Section: The Role Of Sediment Thickness and Basin Geometry In Footwalmentioning

confidence: 99%

The eastern foothills of the Eastern Cordillera of Colombia: An example of multiple factors controlling structural styles and active tectonics

Mora

Parra

Strecker

et al. 2010

Geological Society of America Bulletin

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We decipher the geometry, timing, and kinematics of deformation of a region in the eastern foothills of the Eastern Cor dillera of Colombia. We assess the infl uence of inherited structural fabrics, changes in basin geometry, erosional denudation, and the characteristics of the tectonic stress fi eld with respect to the evolution of the structural styles of the deformation front in the Eastern Cordillera. Detailed structural and geomorphic mapping of an area of ~5000 km 2 , analysis of seismic-refl ection profi les, crosssection balancing, tectonic stress-fi eld indicators, and new apatite fi ssion-track data are used to characterize the partitioning of Late Cenozoic deformation in the eastern foothills of the Eastern Cordillera of Colombia. During the late Miocene-Pliocene, in the Eastern Cordillera, deformation migrated from inverted master normal faults to lowelevation, low-amplitude structures in the foreland. However, this shift in the locus of deformation was not spatially uniform. The deformation front is wider in a northern sector of the Cordilleran foothills, where sedimentary units are thicker, and shortening is perpendicular to the structures. This shortening direction is identical to the direction of the greatest horizontal stress S Hmax as seen in borehole breakouts. During the late MiocenePliocene, basement ranges are passively uplifted by younger, more frontal thrusts. The eastern foothills of the Eastern Cordillera thus reveal a complex combination of factors responsible for the structural styles and partitioning of active deformation in an inversion orogen. Over time, the most important factor changes, from the role of inherited structural fabrics to the geometries of basin fi lls.

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Section: The Role Of Sediment Thickness and Basin Geometry In Footwalmentioning

confidence: 99%

The eastern foothills of the Eastern Cordillera of Colombia: An example of multiple factors controlling structural styles and active tectonics

Mora

Parra

Strecker

et al. 2010

Geological Society of America Bulletin

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“…Specific studies on lateral thrust terminations and transverse zones in thrust belts include studies in the Appalachians (Mitra 1988, Thomas andBayona 2002); Rocky Mountains in Utah (e.g. Paulsen & Marshak 1988 and in Canada (Fermor 1999;Bégin and Spratt 2002); the Andes (Mon et al 2005, Hinsch et al 2002; Alps (Laubscher 1985); Pakistan (McDougall and Khan 1990) and the Pyrenees (Soto et al 2002). Less sharp changes in thrust architecture involving curvature of the thrust front are related to the salient-recess problems and are particularly well studied in the Appalachians (e.g.…”

Section: Transverse Zones and Their Origin: Comparisons With Other Thmentioning

confidence: 99%

Lateral variations and linkages in thrust geometry: the Traligill Transverse Zone, Assynt Culmination, Moine Thrust Belt, NW Scotland

Krabbendam

Leslie

2010

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Abrupt lateral changes in thrust geometry occur in many fold-and-thrust belts along so-called transverse zones, commonly related to pre-existing basement faults. However, the causative structures are usually concealed. We analyse here the Traligill Transverse Zone in the Assynt Culmination of the Caledonian Moine Thrust Belt, NW Scotland. This transverse zone trends sub-parallel to the WNW transport direction and is associated with en echelon faults cutting thrusts, discontinuity of thrust architecture and oblique fold-and-thrust structures. Thick thrust sheets north of the Transverse Zone contain thick basement slices; thrust sheets to the south are thin and involve a thin-bedded sequence. The Traligill Transverse Zone developed above the Loch Assynt Fault, a basement cross-fault, , and reactivated Proterozoic ductile shearzone. Piercing point analysis shows that the cross-fault was active both before and after thrusting. Thrusting thus affected strata that were already disrupted by steep faults. The amplitude of the disturbance in fold-and-thrust architecture along the Traligill Transverse Zone is much greater than the vertical displacement along the fault; this is attributed to localised transpressional thruststacking. Other basement cross-faults and their relationship with lateral variations within the Moine Thrust Belt and in other thrust belts are discussed. (end of Abstract)

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“…Due to denudation and erosion of the uplifting Eastern Andes, mainly fluvial sediments have been deposited here at least since Miocene times (Gubbels et al, 1993;Eji Uba et al, 2006). The Subandean foothills represent the easternmost topographic expression of Andean uplift and deformation (Hinsch et al, 2002). They consist of Tertiary and Pleistocene conglomerates and sands of mostly fluvial origin (Marshall and Sempere, 1991).…”

Section: Regional Settingmentioning

confidence: 99%

Late Quaternary paleosol–sediment-sequences and landscape evolution along the Andean piedmont, Bolivian Chaco

2008

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Basement control on oblique thrust sheet evolution: seismic imaging of the active deformation front of the Central Andes in Bolivia

Cited by 13 publications

References 27 publications

The eastern foothills of the Eastern Cordillera of Colombia: An example of multiple factors controlling structural styles and active tectonics

The eastern foothills of the Eastern Cordillera of Colombia: An example of multiple factors controlling structural styles and active tectonics

Lateral variations and linkages in thrust geometry: the Traligill Transverse Zone, Assynt Culmination, Moine Thrust Belt, NW Scotland

Late Quaternary paleosol–sediment-sequences and landscape evolution along the Andean piedmont, Bolivian Chaco

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