New Magnetic Anomaly Map of the Antarctic

The second generation Antarctic magnetic anomaly compilation for the region south of 60°S includes some 3.5 million line-km of aeromagnetic and marine magnetic data that more than doubles the initial map's near-surface database. For the new compilation, the magnetic data sets were corrected for the International Geomagnetic Reference Field, diurnal effects, and high-frequency errors and leveled, gridded, and stitched together. The new magnetic data further constrain the crustal architecture and geological evolution of the Antarctic Peninsula and the West Antarctic Rift System in West Antarctica, as well as Dronning Maud Land, the Gamburtsev Subglacial Mountains, the Prince Charles Mountains, Princess Elizabeth Land, and Wilkes Land in East Antarctica and the circumjacent oceanic margins. Overall, the magnetic anomaly compilation helps unify disparate regional geologic and geophysical studies by providing new constraints on major tectonic and magmatic processes that affected the Antarctic from Precambrian to Cenozoic times.The members of SCAR’s ADMAP expert group and their affiliated institutions contributed raw and processed magnetic survey data and cooperated in developing the new compilation. SCAR supported the ADMAP expert group’s activities, and the Korea Polar Research Institute (KOPRI) programs, PM15040 and PE17050, funded the compilation at the All-Russian Scientific Research Institute for Geology and Mineral Resources of the World Ocean (VNIIOkeangeologia). New data acquisitions were supported by Germany’s AWI/Helmholtz Center for Polar and Marine Research and the Federal Institute for Geosciences and Natural Resources, the British Antarctic Survey/Natural Environmental Research Council, the Italian Antarctic Research Programme, the Russian Ministry of Natural Resources, the U.S. National Science Foundation and National Space and Aeronautics Administration, the Australian Antarctic Division and Antarctic Climate & Ecosystem Cooperative Research Centre, the French Polar Institute, and the global geomagnetic observatories network (INTERMAGNET). The manuscript benefitted from the constructive comments of Joachim Jacobs and an anonymous reviewer