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TitleGeophysical models of the Montresor metasedimentary belt and its environs, central Nunavut, Canada
AuthorTschirhart, VORCID logo; Percival, J A; Jefferson, C W
SourceCanadian Journal of Earth Sciences vol. 52, no. 10, 2015 p. 833-845, Open Access logo Open Access
Alt SeriesEarth Sciences Sector, Contribution Series 20140405
PublisherCanadian Science Publishing
Mediapaper; on-line; digital
File formatpdf
NTS66G; 66H; 66I; 66J
AreaMontresor Belt
Lat/Long WENS -98.0000 -96.0000 66.2500 65.4167
Subjectsstructural geology; general geology; mineralogy; hydrothermal alteration; mineralization; alteration; intrusions; epidote; hematite; quartz; magnetization; modelling; Montresor Belt
Illustrationsgeological sketch maps; location maps; geophysical images; tables; gravity profiles; 3-D models
ProgramGEM2: Geo-mapping for Energy and Minerals Rae Province, Chantrey-Thelon
Released2015 10 01
AbstractRecent identification of hydrothermally altered rocks and breccia in the underexplored Montresor belt of Paleoproterozoic metasedimentary rocks suggests the possible presence of undiscovered mineralization. This study examines potential field data from the region with the goal of identifying subsurface features that could be associated with or serve as vectors to mineralization (subsurface alteration zones, faulting and (or) igneous intrusions). Gravity data were used to model regional and local geological features using known geology and physical properties from the study area and environs as constraints, and documents dense intrusive bodies underlying the Paleoproterozoic sequences. Maps of transformed apparent magnetic susceptibility values outline corridors of weak magnetization that correspond to observed zones of non-magnetic breccia and epidote - hematite - quartz alteration. Imputing the apparent susceptibility and rock property information into a magnetic forward model defines the geometry of this alteration zone, which is best explained as a northerly dipping non-magnetic or demagnetized, metasomatized intrusive sheet. The presence of previously undocumented igneous intrusions, their association with demagnetized hydrothermal breccia, and the continuity of the demagnetized zone suggests additional prospective areas within the region. This geological - geophysical framework for the nature and geometry of the Montresor belt and its surrounds highlights the importance of integrated modelling for areas with limited data.
Summary(Plain Language Summary, not published)
Recent identification of hydrothermal alteration in the Montresor belt, Nunavut, suggests undiscovered mineral potential. This paper presents geophysical models of the Montresor belt and surrounding rock packages, with the goal of vectoring toward favorable areas. Prospective zones are identified, as well as several igneous bodies at depth that may have played a role in the hydrothermal regime.

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