Basement slivers within the New Britain accretionary wedge: implications for the emplacement of some ophiolitic slivers

Article Abstract:

Oceanic basement slivers from the western Solomon Sea were imaged using the multichannel seismic reflection method. The latest accreted sliver is located five kilometers from the thrust front. An estimate of the area balance points out the source of this sliver as a portion of the dipping plate located 11 to 15 kilometer arcward. Pinching of the sedimentary layers indicate the region at which detachment took place. It was placed at nine to 12 kilometers from the seaward edge. Faults were also reactivated at or near the accretion zone indicating that detachment took place along weakened areas.

Natural history, Subduction zones (Geology), Subduction zones, Neotectonics, Bismarck Archipelago

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Trench-parallel stretching and folding of forearc basins and lateral migration of the accretionary wedge in the southern Ryukyus: A case of strain partition caused by oblique convergence

Article Abstract:

Seafloor mapping in the area east of Taiwan provided structural images of the seafloor and crust around the Ryukyu forearc area. The study revealed that slip partitioning, due to oblique convergence, could have been localized over a major transcurrent fault at the end of the accretionary wedge for an obliquity of 40 degrees, or distributed over the width of sedimentary wedge, for an obliquity of 60 degrees.

Ocean bottom

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