Buried sedimentary mounds in the Nyk High area, Mid-Norwegian continental margin, are described from a 3D-seismic dataset and discussed in relation to modern deep-water sedimentary mounds. The mounds are circular to elongate in shape and their dimensions are: 20-50 m high, 50-400 m wide and up to 600 m long. Internally, the mounds exhibit relatively low acoustic reflectivity. They occur on the lower flanks of the Nyk High which at the time of deposition protruded some 250 m above the surrounding sea-floor. Further basinward the mound province makes way for a lower energy ooze/mud-dominated environment, characterized by polygonal faulting. The mounds’ location and relationship to under- and overlying sediments, and the fact that they compare favourably in size and geometry to present day Lophelia-mounds suggests that they are buried Lophelia-mounds of Miocene-Pliocene age.
Buried sedimentary mounds in the Nyk High area, Mid-Norwegian margin: Are they Miocene-Pliocene cold-water coral mounds?