3-D Regional Structural Model Construction
Kattiniq (Raglan Mine) region
Nunavik territory of northern Québec
Authors: Eric de Kemp, Mary Sanborn-Barrie and Marc St-Onge
Introduction
This 3-D gocad model represents a collection of surface interpretations for late normal faults, major thrust faults and regionally significant stratigraphic horizon tops for the Paleoproterozoic rocks underlying three regional map sheets.
The model extends across 1:50,000 map sheets (GSC Maps 1724A, 1725A, 1726A) covering approximately 80 km x 30 km (Figure 1), and is dominantly underlain by the 2.04-1.96 Ga Povungnituk Group; polydeformed mafic to ultramafic metavolcanic rocks, with a spectrum of semi-pelitic to arkosic metasedimentary rocks and and the primarily igneous 1.89 Ga Chukotat Group and associated peridotitic and gabbroic intrusive suite.
Only publicly available data from Geological Survey of Canada field mapping programs and drill locations reported in E-Sigéom databases from the Resources Naturelles et Faune de Québec were used in this 3-D interpretation.
Figure 1: Raglan Ni deposit fault (Red surfaces) and horizon tops (Yellow surfaces) developed with SPARSE© Using GSC map data and interpreted cross-sections.
Database Structure
All data is embedded in a gocad 2.1.3 project file. For data conversion into other formats please see 3'rd party service providers.
Corrections and Additions
Every attempt was made to provide 3-D surface interpretations that, at minimum, are constrained to the field observations and associated 2-D map and section interpretations (see 2-D Model Folder). Inconsistencies between the various cross sections and surface maps may appear in this model due to ongoing updating of the interpretive data sets. Please send feedback or suggestions for a more rigorous updating of the model that will result in a) increased accuracy of the interpreted surfaces b) more realistic rending of volumes and/or c) increased usefulness to specific exploration and/or communication activities to:
Eric de Kemp
Natural Resources Canada, Geological Survey of Canada
615 Booth Street, Ottawa, ON, Canada K1A 0E9.
Phone (613) 947-3738;
Fax: (613) 995-9273;
E-mail: .
Acknowledgements
Thanks to Kevin Sprague for providing much needed tools for doing this interpretation with the SPARSE© plug-in to gocad. Thanks also to Mira Geoscience for providing ongoing advice on 3-D integration methodologies used throughout the project. Many thanks to Ingrid Henderson for her efforts converting various GIS data sets from the study area. Thanks also to Crystal LaFlamme who facilitated data conversion into Gocad from ArcGIS for much of the study area.
Data sources
Lucas, S.B. and St-Onge, M.R., 1992, Terrane accretion in the internal zone of the Ungava orogen, northern Québec. Part 2: Structural and metamorphic history, Canadian Journal of Earth Sciences, Vol. 29, pp. 765-782.
Picard, C., Lamothe, D., Piboule, M. and Oliver, R., 1990, Magmatic and geotectonic evolution of a Proterozoic oceanic basin system: the Cape Smith Thrust-Fold Belt (New-Quebec), Precambrian Research, Vol. 47, Issues 3-4, pp. 223-249
Resources Naturelles et Faune de Québec, E-Sigéom à la Carte, 2006 Web site:
St-Onge, M.R., Lucas, S.B. and Parrish, R. 1992, Terrane accretion in the internal zone of the Ungava orogen, northern Québec. Part 1: Tectonostratigraphic assemblages and their tectonic implications, Canadian Journal of Earth Sciences, Vol. 29, pp. 746-764.
St-Onge, M.R., Lucas,S.B., Scott, D.J. and Wodicka, N. 1999, Upper and lower plate juxtaposition, deformation and metamorphism during crustal convergence, Trans-Hudson Orogen (Quebec–Baffin segment), Canada,Precambrian Research, Vol. 93, Issue 1, pp. 27-49
St-Onge, M.R. and Lucas, S.B., 1990, Geology, Lac des Deux-îles, Québec, GSC, Map 1724A, scale 1:50,000.
St-Onge, M.R. and Lucas, S.B., 1990, Geology, Lac Fleury, Québec, GSC, Map 1725A, scale 1:50,000
St-Onge, M.R. and Lucas, S.B., 1990, Geology, Lac Rinfret, Québec, GSC, Map 1726A, scale 1:50,000