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Creators/Authors contains: "Coakley B.J."

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  1. The history of the Canada Basin is poorly understood due to its isolation by distance and ice. The best available evidence suggests the Canada Basin formed during a 66˚ counterclockwise rotation of Northern Alaska away from the Canadian Arctic Islands during the Mesozoic. Gravity and magnetic anomaly data show a linear feature that has been interpreted as an extinct Mid Ocean Ridge, buried under thick turbidites and other sediments. For this study we collected MCS data to constrain the Canada Basin sedimentation history and crustal structure and improve our understanding of the basin. During the summer of 2021, we collected ~4514 km of multichannel-seismic reflection (MCS) data complemented by sonobuoy and OBS data across Canada Basin, Arctic Ocean. The MCS data were acquired with two 520 cu inch GI air guns and a 200 meter (32 channels) streamer. The MCS data was processed by eliminating bad traces, applying a bandpass filter, an FK filter to minimize coherent noise, an FX filter to reduce random noise. The filtered traces were then corrected for normal moveout. This utilized a velocity model from this study area. We then stacked to strengthen the signal and applied post-stack migration to relocate the reflection signal for the effect of dipping reflectors. The seismic profiles close to the Northwind Ridge in the west show a relatively flat basement, with thinner sediments compared to the seismic profile over the inferred mid-oceanic ridge. The seismic profiles crossing the mid-oceanic ridge show a high relief central valley. The basement parallel to the inferred ridge axis is smooth, suggesting the ridge is unsegmented, which is consistent with an ultra-slow spreading mid-oceanic ridge. Origin as an ultra-slow spreading ridge constrains the history of the basin, for example indicating the magnetic striped section of the seafloor, that has been interpreted as oceanic crust, based on sonobuoy refractions results, required 15 - 30 Ma to form. 
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