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TitleSpatio-temporal distribution of Devonian post-accretionary granitoids in the Canadian Appalachians: implications for tectonic controls on intrusion-related mineralization
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorKellett, D AORCID logo; Piette-Lauzière, N; Mohammadi, N; Bickerton, L; Kontak, D; Rogers, N; Larson, K
SourceTargeted Geoscience Initiative 5: contributions to the understanding and exploration of porphyry deposits; by Plouffe, AORCID
logo (ed.); Schetselaar, EORCID logo (ed.); Geological Survey of Canada, Bulletin 616, 2021 p. 7-23, Open Access logo Open Access
PublisherNatural Resources Canada
Mediaon-line; digital
RelatedThis publication is contained in Targeted Geoscience Initiative 5: contributions to the understanding and exploration of porphyry deposits
File formatpdf; xlsx (Microsoft® Excel®)
ProvinceNew Brunswick; Newfoundland and Labrador; Nova Scotia; Quebec
NTS1; 2; 10; 11; 12; 20; 21; 22; 31H; 31I; 31P; 32A; 32H
Lat/Long WENS -72.5000 -52.0000 52.0000 42.0000
Subjectseconomic geology; tectonics; structural geology; geochronology; Science and Technology; Nature and Environment; Upper Devonian; mineral deposits; metals; polymetallic ores; tungsten; molybdenum; tin; mineral exploration; ore mineral genesis; mineralization; ore controls; tectonic history; magmatism; intrusions; orogenies; accretion; fluid flow; emplacement; faulting; plate margins; geodynamics; host rocks; bedrock geology; structural features; shear zones; faults; lithology; igneous rocks; granitic rocks; intrusive rocks; volcanic rocks; kinematic analysis; radiometric dating; uranium lead dating; structural analyses; crustal structure; lithosphere; Appalachian Orogen; Phanerozoic; Paleozoic; Devonian
Illustrationsgeoscientific sketch maps; plots
ProgramTargeted Geoscience Initiative (TGI-5) Intrusion/Porphyry ore systems - porphyry processes - mineral markers
Released2021 09 01; 2022 11 17
AbstractIntrusion-related mineralization in the Canadian Appalachian Orogen is widespread and associated with Devonian post-accretionary granitoids. Here we review the spatial and temporal distribution of post-accretionary magmatism across the orogen, and the coeval structural network that may have facilitated magma ascent and emplacement. We demonstrate that magmatism and associated intrusion-related mineralization were particularly widespread during the Late Devonian, occurring within all tectonic zones of the orogen. This, along with published petrological arguments, suggests a deep and orogen-scale source for both magma and metals. Lithospheric delamination following terminal continent-continent collision may be a plausible process to initiate magmatism at such a scale, and if so, may be an important geodynamic process for intrusion-related mineralization. The magmatic belts are spatially associated with shear zones and faults that formed or reactivated during the Late Devonian and likely facilitated magma ascent independent of their kinematics. Further work is required to relate fault kinematics and slip events to magma emplacement.
Summary(Plain Language Summary, not published)
This Bulletin published by the Geological Survey of Canada contains ten articles summarizing the results of five-year research projects conducted on porphyry deposits in Canada as part of the Targeted Geoscience Initiative (TGI). Porphyry deposits are ore bodies, including past-producing and active mines, associated with intrusive rocks such as granite. They are significant producers of a variety of metals, including copper, molybdenum, tin and tungsten. Nine out of ten papers describe projects conducted in the Canadian Cordillera where most Canadian porphyry deposits occur and a paper on similar, but older deposits in the Appalachians of Atlantic Canada. The main objective of these TGI research projects was to better define the geological conditions where porphyry deposits form and test techniques to detect buried porphyry deposits in support of mineral exploration.

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