00000nam 2200000za 4500 9.855843 CaOODSP 20251031142447 cr ||||||||||| 180426s2018 oncb ob f000 0 eng d CaOODSP eng n-cn-ab n-cn-nt n-cn-nu n-cn-sn M183-2/8343E-PDF Thomas, M. D. Definition of magnetic domains within the Rae craton, mainland Canadian Shield, Nunavut, Northwest Territories, Saskatchewan, and Alberta [electronic resource] : their magnetic signatures and relationship to geology / M.D. Thomas. [Ottawa] : Natural Resources Canada, 2018. 100 p. : col. maps. Open file ; 8343 Includes bibliographical references. “The Archean Rae craton, western Churchill Province, occupies a huge area within the northwestern mainland Canadian Shield. It extends >1600 km from the Talston magmatic zone northeastward to the east coast of Melville Peninsula, ranging in width from roughly 300 km to 900 km. The craton is covered by aeromagnetic data collected over many decades by Canada’s National Aeromagnetic Survey Program, typically along lines 805 m apart at a flight elevation of 305 m. Additionally, many higher resolution aeromagnetic surveys have been completed during the last decade or so. The craton is geologically mapped at various scales, but most geological coverage is at a relatively large scale. For this reason magnetic data provided by the national program are considered to be of sufficient resolution to investigate relationships with geology. Here, seventy-five magnetic domains are defined using textures, fabrics, patterns, orientations and intensities of residual total magnetic field anomalies and their derivative equivalents (first vertical derivative, tilt angle). Given that patterns and orientations of narrow derivative magnetic anomalies reflect closely geological structure, the magnetic domains can be viewed essentially as representative of structural domains”--Abstract, p. 1. Shields (Geology) Geomagnetism Domain structure Maps Canada. Natural Resources Canada. Geological Survey of Canada. Open file (Geological Survey of Canada) 8343. (CaOODSP)9.506878 PDF 8.25 MB https://publications.gc.ca/collections/collection_2018/rncan-nrcan/m183-2/M183-2-8343-eng.pdf 306561