Exhumation Signs of Ultramafics in Knipovich Ridge (North Atlantic)

摘要

Knipovich Ridge representing the northernmost segment of the Mid-Atlantic Ridge (MAR) is located between Greenland and the Spitsbergen Archipelago. In the south, it almost orthogonally joins Mohns Ridge, and in the north, it is bordered by the Molloy fault zone. The ridge is 550 km long (from 73°45' to 78°35' N). It occupies an asymmetrical position relative to the continents being displaced toward the Spitsbergen Archipelago. The other important features of the ridge are its ultraslow spreading velocity (0.7 cm/year) and lack of transform faults, although being compensated by development by numerous nontransform offsets with a "step" of 10-30 km and oriented in the northwesterly direction obliquely relative to the near-meridional strike of the rift valley.