Geological features of the northeastern Canadian Arctic margin revealed from analysis of potential field data

摘要: Abstract The northeastern Canadian Arctic margin is bordered to the north by Alpha Ridge, a dominantly magmatic complex within Amerasia Basin of Ocean, which forms part High Large Igneous Province (HALIP). characteristics gravity and magnetic anomaly fields change notably along margin, with two main segments recognised. Aeromagnetic data in transition zone between these contrasting domains are analysed here detail. Results obtained using variety edge enhancement (derivative) methods highlight several major offshore sedimentary basin as well some known number previously unknown tectonic elements. A intrusion distribution map derived from enhanced maps reveals that rocks much more widespread relatively shallow subsurface than implied surface geological mapping. Magmatic intrusions (mainly dykes) other structures have NW–SE, NE–SW N–S trends. Broad pseudogravity lows across most Sverdrup region due thick, less dense succession low magnetised crust. Magnetic highs observed over Ridge indicate high crustal magnetisation associated occurrence extensive voluminous bodies. Absence volcanic intrusive imaged beneath northeast suggests probably formed after cessation HALIP magmatism.