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TitleStructural and lithological controls on the nature and distribution of gold at the Tiriganiaq deposit, Meliadine district, Rankin Inlet Greenstone Belt, Nunavut
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AuthorSt.Pierre, B; Mercier-Langevin, P; Simard, M; Côté-Mantha, O; Malo, M; Servelle, G
SourceTargeted Geoscience Initiative: 2018 report of activities; by Rogers, N (ed.); Geological Survey of Canada, Open File 8549, 2019 p. 77-82, https://doi.org/10.4095/313642 (Open Access)
Year2019
PublisherNatural Resources Canada
Documentopen file
Lang.English
Mediaon-line; digital
RelatedThis publication is contained in Rogers, N; (2019). Targeted Geoscience Initiative: 2018 report of activities, Geological Survey of Canada, Open File 8549
File formatpdf
ProvinceNunavut
NTS55J/13; 55J/14; 55K/15; 55K/16; 55N/01; 55N/02; 55N/07; 55N/08; 55O/03; 55O/04; 55O/05; 55O/06
AreaRankin Inlet
Lat/Long WENS -92.8167 -91.2333 63.2667 62.7667
Subjectseconomic geology; regional geology; structural geology; tectonics; mineral deposits; mineral exploration; gold; ore mineral genesis; mineralization; ore controls; structural controls; greenstone belts; modelling; bedrock geology; lithology; sedimentary rocks; iron formations; siltstones; igneous rocks; volcanic rocks; mafic volcanic rocks; intrusive rocks; mafic intrusive rocks; structural features; faults; splays; folds; shear zones; foliation; veins; dykes; tectonic setting; deformation; kinematic analysis; Archean; Churchill Province; Rankin Inlet Greenstone Belt; Meliadine District; Tiriganiaq Deposit; Pyke Fault; Lower Fault; Oxide Formation; Tiriganiaq Formation; banded iron formation-hosted (BIF) deposits; extension; Precambrian
Illustrationslocation maps; geoscientific sketch maps; cross-sections; photographs; photomicrographs
ProgramKnowledge Management Coordination, Targeted Geoscience Initiative (TGI-5)
ProgramGold ore systems - tectonic drivers and conduits, Targeted Geoscience Initiative (TGI-5)
Released2019 03 01
AbstractThe Archean Meliadine gold district, Rankin Inlet greenstone belt, Nunavut, contains numerous gold deposits and prospects that are spatially associated with the crustal-scale Pyke Fault and its splays. Many of these deposits are partially to dominantly hosted within banded iron formation (BIF), including at the Tiriganiaq mine where gold is hosted in complexly folded and sheared BIF-associated zones.
The Tiriganiaq deposit is hosted in the structural hanging wall of the Lower Fault, a west-trending splay of the Pyke Fault located further to the south. The Lower Fault marks a break between the footwall mafic volcanic-dominated sequence (south) and a turbiditic dominated sequence in the hanging wall (north). The hanging wall units host the ore-bearing, decimetre- to metre-wide laminated quartz-ankerite shear vein referred to as the 1000 lode.
A large part of the ore at Tiriganiaq is hosted within the Upper Oxide Formation, a package of iron-rich sedimentary rocks and BIF units. The southernmost ore zone (1100 lode) consists of a geometrically planar mineralized corridor associated with the transposed long limb of the folded BIF. The more geometrically and structurally complex 1150 and 1250 lode series are controlled by Lower Fault-parallel, narrow, north-dipping, reverse shear zones that overprint the slightly steeper, north-dipping S2 foliation that is axial planar to tight F2 folds. Shallowly south-dipping extension-al veins, associated with the shear zones and related fault-fill veins, are preferentially developed in tightly folded decimetre- to metre-thick BIF layers around the moderately north-dipping reverse shear zones.
GEOSCAN ID313642