Paleocene Pacific Plate reorganization mirrored in formation of the Suvarov Trough, Manihiki Plateau

• Published in: Journal of Geophysical Research: Solid Earth
• Main Authors: Pietsch, Ricarda, Uenzelmann-Neben, Gabriele
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: Wiley 2016
• Subjects: Danger Islands; Pacific
• Online Access: https://epic.awi.de/id/eprint/41673/; http://onlinelibrary.wiley.com/doi/10.1002/2016JB013355/abstract; https://hdl.handle.net/10013/epic.48926

The Suvarov Trough is a graben structure that deviates from the Danger Islands Troughs within the Manihiki Plateau, a Large Igneous Province (LIP) located in the Central Pacific. New high resolution seismic reflection data provide evidence that the graben formed in two phases during the Paleocene (65-45 Ma). In a first phase extension occurred in south-westward direction, pulling apart the northern part of the Suvarov Trough and a parallel trending, unnamed trough. In a second phase a change of extensional force direction occurred from southwest to west-northwest, forming the southern part of the Suvarov Trough that extends onto the High Plateau. The formation of the Suvarov Trough is accompanied by a series of normal fault systems that apparently formed simultaneously. Comparing the seismic results to existing Pacific paleo strain reconstructions, the timing of increased strain and local deformation direction fits well to our findings. We thus suggest that the multiple strike directions of the Suvarov Trough represent an extensional structure that was caused by the major, stepwise Pacific Plate reorganization during the Paleocene.