Thrust tectonics on Brøggerhalvøya and their relationship to the Tertiary West Spitsbergen Fold-and-Thrust Belt

摘要: The Tertiary fold-and-thrust belt on Broggerhalvoya is characterized by a NE-vergent pile of nine thrust sheets. sole the located in Precambrian phyllites and climbs up-section to northeast. Four lower sheets consisting predominantly Upper Palaeozoic sediments are overlain two central part stack which contain kilometre-scale syncline anticline. fold cut juxtaposed thrusts giving rise formation three structurally higher basement-dominated A multiple-stage kinematic model proposed including (1) in-sequence foreland-propagating response N–S subhorizontal bedding-parallel movements, (2) change tectonic transport ENE out-of-sequence thrusting fold-structure followed (3) truncation stacking highest hind-ward-propagating thrusting. strain compressive with exception sheets, reflecting temporal more transpressive regime. Thrusting was (4) extension (5) W–E extension. Comparison structural geometry evolution data reported for further south allows us assume coeval belt. latest Paleocene/Early Eocene age main phase suggested West Spitsbergen Fold-and-Thrust Belt; phases therefore pre-date separation Svalbard Greenland due right-lateral movements along Hornsund Fault Zone. belt’s Forlandsundet Graben can be linked plate-kinematic framework span between Paleocene Middle times.