The Keisarhjelmen detachment records Silurian–Devonian extensional collapse in Northern Svalbard

• DOI: 10.1111/ter.12305
• Publication Date: 2017-10-17T12:38:43Z
• Authors: Alvar Braathen; Per Terje Osmundsen; Harmon Maher; Morgan Ganerød
• Keywords: Detachment fault; Devonian; Metamorphic core complex; Extensional tectonics; Late Devonian extinction

Abstract At the junction of Atlantic and Arctic margins, crustal‐scale Keisarhjelmen detachment north‐west Svalbard records previously unrecognised magnitudes extension. The separates a corrugated metamorphic core complex in footwall from mantling Devonian supradetachment basin hangingwall. has top‐N displacement more than 50 km, which is aligned with map‐scale corrugations, an upwards ductile to brittle transition shear related retrogression. This configuration striking similarities extensional collapse detachments paired Scandinavian–Greenland Caledonides, but orientation position link Ellesmerian orogen.