Of the many dedicated individuals involved in RAMP, Katy Farness and John Crawford merit special mention because of their many important contributions over the duration of the project. We are grateful to the Canadian Space Agency for its substantial support of the project.Cover Image. Composite of RAMP project InSAR speeds, balance velocity speeds, flow stripes, coastline and SAR mosaic iii
The Antarctic Peninsula (AP) is a Mesozoic-Cenozoic Andean-type magmatic arc resulting h m subduction of Pacific Ocean lithosphere beneath its western margin. During the past 60 million years discrete segments of the Pacific-Phoenix spreading ridge have successively collided with the westem margin of the AP diachronously fiom south to north in a series of ridge-crest collision episodes. Previous work suggested that the AP (upper plate) was tectonically segmented due to subduction of discrete ridge-crest segments, With segments bounded by the projection of oceanic fracture zones (OFZ). An ERS-1 S A R mosaic was created over the Graham Land-Palmer Land Transition Zone (TZ) and combined with aeromagnetic anomaly and mapped geologic data to study how the process of OF2 subduction modified AP structure. Good correlation of S A R lineament trends and mapped fault trends on Alexander Island provide evidence that some of the S A R lineaments are structurally controlled. Correlation between the S A R and aeromagnetic lineaments suggests both mark crustal structures in the TZ. A model invoking distributed left-lateral fault motion can produce that tight dextral curvature across the TZ and explain the lineament patterns. Correlation between lineament trends and OFZ traces suggests that faulting reflects the response of the AP crust to OF2 subduction.
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