A Middle Jurassic to early tertiary Andean-Sierran arc model for the coast belt of British Columbia

Article Abstract:

A middle Jurassic to early tertiary Andean-Sierran arc model for the coast belt of British Columbia indicates that a prolonged east dipping subduction of Pacific Ocean lithosphere beneath a single superterrane results in the formation of the middle Jurassic and Younger components of the Coast Belt. The single composite subterrane was accreted to ancestral North America in Middle Jurassic time. The continental edge shifted to a new position to the west of the accreted superterrane, due to the closure of the intervening Cache Greek-Bridge River suture. There has been no change in the overall coherence of features of the western Canadian Cordillera.

Analysis, Pacific Ocean, British Columbia, Subduction zones (Geology), Subduction zones, Continental margins

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Subsidence of a volcanic basin by flexure and lower crustal flow: the eastern Snake River Plain, Idaho

Article Abstract:

A study was conducted on the northwest edge crustal flexure of the eastern Snake River Plain, ID. The basin's dense load dimensions were modeled using the flexure. Results indicate lower crustal flow from the basin and density-driven subsidence. Subsidence and isostatic equilibrium were found to be caused by density-driven lower crustal flow. Exploratory wells in the area were also found to constrain the timing of subsidence.

Research, Subsidences (Earth movements), Land subsidences, Basins (Geology), Snake River Plain

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Geometry and structural evolution of the central andean backthrust belt, Bolivia

Article Abstract:

Research establishing data pertaining to the structural evolution and the geometry of the Andean backthrust belt of Bolivia is presented. Particular attention is given to the geological characteristics of the Central Andean plateau and the basement thrusts.

Bolivia, Andean Region

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