Abstract
SUMMARY A compilation of magnetic data in the western North Atlantic shows that seafloor spreading magnetic anomalies 26 to 18 are dislocated across a (pseudo-) fault with a direction mirroring that of King's Trough. It is interpreted that this feature and King's Trough were formed by northward propagation of the rift, initiated by a hotspot that created the Azores-Biscay Rise. The rift propagation stopped when King's Trough became part of the plate boundary between Eurasia and Iberia at chron 17. Most of the present-day structure of King's Trough was created by extensional motion across this plate boundary from chron 17 to 9/6c.
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