The Coast Belt Thrust System: evidence of late cretaceous shortening in southwest British Columbia
Article Abstract:
The study of the geology, the structural setting and the deformation history of the coast belt Thrust System in British Columbia reveal a two-stage history of Late Cretaceous shortening. Supercrustal arc and related basin sequences along the inboard margin were structurally imbricated in the early stages of shortening. In the later stages, there was folding of Jura Cretaceous arc sequences in Western Coast Belt foreland and thin skinned thrusting. The north eastward migration of the deformation front was due to the development of thick skinned out-of sequence thrusts in the imbricate and hinterland zone of the Coast Belt Thrust System.
Publication Name: Tectonics
Subject: Earth sciences
ISSN: 0278-7407
Year: 1993
User Contributions:
Comment about this article or add new information about this topic:
Growth stratal records of instantaneous and progressive limb rotation in the Precordillera thrust belt and Bermejo basin, Argentina
Article Abstract:
Synorogenic deposits preserved near the thrust front zone and thrust belt of the Precordillera fold and in the Bermejo foreland basin in central Argentina were analyzed to trace the evolution of deformation during the last 5 Myr and to study the trust system kinematics. The seismic lines across the region indicate progressive and instantaneous limb rotations. The Niquivil thrust in the Central Precordillera's easternmost thrust plate was found to have experienced episodic motion in a first thrust movement as a fault-propagation fold and in a second movement as a high-angle anticlinal breakthrough fault after a period of quiescence.
Publication Name: Tectonics
Subject: Earth sciences
ISSN: 0278-7407
Year: 1996
User Contributions:
Comment about this article or add new information about this topic:
Inverse and forward numerical modeling of trishear fault-propagation folds
Article Abstract:
A kinematic model called trishear is developed to explain footwall synclines, changes in stratigraphic thickness and dip on the forelimbs of fault-propagation folds. Trishear as well as hybrid trishear-fault-bend fold deformation may be analyzed using a computer program. Simulation tests show that changes in trishear fold shape may result from changes in the propagation to slip ratio and the apical angle of the trishear zone.
Publication Name: Tectonics
Subject: Earth sciences
ISSN: 0278-7407
Year: 1998
User Contributions:
Comment about this article or add new information about this topic:
- Abstracts: Muscovite-garnet granites in the Mojave Desert: relation to crustal structure of the cretaceous arc: comment and reply
- Abstracts: The geochemistry and petrogenesis of the late-Cretaceous picrites and basalts of Curacao, Netherlands Antilles: a remnant of an oceanic plateau
- Abstracts: An experimental calibration of the nickel in garnet geothermometer with applications: reply. Non-ideal mixing in the phlogopite-annite binary: constraints from experimental data on Mg-Fe partitioning and a reformulation of the biotite-garnet geothermometer
- Abstracts: Crustal structure in the Middle Urals: results from the (ESRU) Europrobe seismic reflection profiling in the Urals experiments