Effects of oceanic ridge subduction on accretionary wedges: experimental modeling and marine observations

Article Abstract:

A study was conducted to examine accretionary wedge deformation caused by oceanic ridge subduction. Sandbox models are integrated into two experiments for the study. The initial experiment presents a massive ridge forming in a sand wedge. The second experiment describes effects of active basement thrust slice entering a subduction zone. Results show that the width of the wedge is conditioned by basal decollement forward propagation.

Subduction zones (Geology), Subduction zones

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Crustal structure and tectonics of the Ninetyeast Ridge from seismic and gravity studies

Article Abstract:

Research into the crustal structure of the Ninetyeast Ridge in the central Indian Ocean is presented. The basement was found to be carpeted with 0.8km maximum thick sediments and exposed at some of the rises. A number of vertical faults were seen in the basement and overlying sediments of the ridge, indicating that the ridge structure was influenced by the Miocene deformation activity.

Indian Ocean

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Tectonics of the Jurassic- Early Cretaceous magmatic arc of the north Chilean Coastal Cordillear (22 degrees-26 degrees S): A story of crustal deformation along a convergent plate boundary

Article Abstract:

The tectonic evolution of the Jurassic-Early Cretaceous magmatic arc of northern Chile is examined. Oblique shortening is found to be an important process, indicating that arc deformations occurred due to oblique convergence. This agrees with paleogeodynamic reconstructions proposed by previous workers.

Chile, Geology, Stratigraphic, Stratigraphy, Geology, Structural, Structural geology, Jurassic period

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