| Title | Geophysical models of the Montresor metasedimentary belt and its environs, central Nunavut, Canada |
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| Author | Tschirhart, V ;
Percival, J A; Jefferson, C W |
| Source | Canadian Journal of Earth Sciences vol. 52, no. 10, 2015 p. 833-845, https://doi.org/10.1139/cjes-2015-0008  Open Access |
| Image |  |
| Year | 2015 |
| Alt Series | Earth Sciences Sector, Contribution Series 20140405 |
| Publisher | Canadian Science Publishing |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf |
| Province | Nunavut |
| NTS | 66G; 66H; 66I; 66J |
| Area | Montresor Belt |
| Lat/Long WENS | -98.0000 -96.0000 66.2500 65.4167 |
| Subjects | structural geology; general geology; mineralogy; hydrothermal alteration; mineralization; alteration; intrusions; epidote; hematite; quartz; magnetization; modelling; Montresor Belt |
| Illustrations | geological sketch maps; location maps; geophysical images; tables; gravity profiles; 3-D models |
| Program | GEM2: Geo-mapping for Energy and Minerals Rae Province, Chantrey-Thelon |
| Released | 2015 10 01 |
| Abstract | Recent 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. |
| GEOSCAN ID | 295750 |
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