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TitleA method for curvilinear structure mapping in normalized derivative magnetic maps
AuthorBeauchemin, M; Tschirhart, VORCID logo; Harris, J; Lamontagne, MORCID logo
SourceJournal of Applied Geophysics vol. 162, 2018 p. 72-79,
Alt SeriesNatural Resources Canada, Contribution Series 20180343
PublisherElsevier BV
Mediapaper; on-line; digital
File formatpdf (Adobe® Reader®)
Subjectsgeophysics; structural geology; geophysical interpretations; magnetic interpretations; magnetic field; magnetic anomalies; mapping techniques; bedrock geology; structural features; Methodology
Illustrationsgeoscientific sketch maps; flow diagrams; tables
ProgramRemote Sensing Science
Released2018 10 06
AbstractEnhancement techniques are frequently applied on magnetic field maps to facilitate the interpretation of geological units and structures. Among them, the normalized derivative (ND) approach represents a class of techniques specifically designed to balance weak and strong anomalies (Fairhead and Williams, 2006). In this paper, we present an approach for the enhancement, detection and mapping of curvilinear structures in ND magnetic maps. The proposed approach locates ridges and valleys in ND maps using multiscale Hessian analysis and filtering, non-maxima suppression and morphological thinning with anchor points. The efficiency of the method is demonstrated on four different magnetic map subsets with differing geological settings. A practical application of the method is demonstrated using the magnetic maps from the Tehery Lake - Wager Bay region of Nunavut, Canada. Geological features are effectively defined, highlighting near surface structures and key units that are important for understanding the mineral potential of the region.
Summary(Plain Language Summary, not published)
The different types of rocks found in a given region modify the Earth's magnetic field by producing local variations. The measurement of the magnetic field from an airplane provides information on the geological structures responsible for these variations and is useful for geologists. We present a new method made by computer to trace the presence of curved or straight lines in magnetic maps. The effectiveness of the method is demonstrated with examples from different maps as well as a region in Nunavut.

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