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ISBN 978-1-4249-9924-8 [DVD] ISBN 978-1-4249-9925-5[ZIP FILE]

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Stott, G.M. and Josey, S.D. 2009. Post-Archean mafic (diabase) dikes and other intrusions of northwestern Ontario, north of latitude 49°30′; Ontario Geological Survey, Miscellaneous Release–Data 241.

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Miscellaneous Release—Data 241 Post-Archean Mafic (Diabase) Dikes and Other Intrusions of Northwestern Ontario, North of Latitude 49°30΄ by G.M. Stott and S.D. Josey

The publication can be downloaded from http://www.geologyontario.mndm.gov.on.ca/mndmaccess/mndm_dir.asp?type=pub&id=MRD241

Users of OGS products are encouraged to contact those Aboriginal communities whose traditional territories may be located in the mineral exploration area to discuss their project.

Introduction:

This digital data release comprises a GIS-compatible version of Preliminary Map P.3606 (released April 7, 2009), which shows the distribution of Proterozoic mafic (diabase) dikes and other intrusions across northwestern Ontario, north of 49°30’. The map is based on an interpretation of post-Archean features using re-processed aeromagnetic data from regional and high-resolution surveys. The Proterozoic diabase dikes have been grouped into dike swarms where possible. The subdivision of the dikes into separate dike swarms is based on orientation of dike trends in conjunction with available paleomagnetic work on selected dikes (e.g., Buchan et al. 1993; Halls and Davis 2004; Halls et al. 2008) plus U-Pb age determinations of baddeleyite in selected dikes (e.g., Buchan et al. 1993, 1996; Hamilton and Stott 2008 and references therein). Distinction of many dikes with similar trends is difficult and attribution of some dikes to specific swarms (e.g., some assigned to the Mackenzie dike swarm amongst similar trending Matachewan dikes) is speculative. Regional context for the dikes portrayed on this map can be obtained from Buchan and Ernst (2004) and Hamilton and Stott (2008) and references therein.

Other post-Archean intrusions, including carbonatites and related alkalic rocks, are included, some of which are interpreted as such from spatial association with known intrusions. It is intended that this map will stimulate further research in the post-Archean magmatic events. For example, age discrimination amongst sub-parallel dike swarms, such as those trending northeastwards, remain to be resolved. Some of these post-Archean events are accompanied by block rotations (e.g., Halls and Davis 2004) and reactivation along Archean faults, part of a late history that remains a subject of some interest potentially relevant to diamondiferous kimberlite emplacement episodes.

Digital files on this DVD include: ArcGIS® shapefiles (.shp) and associated layer files (.lyr), and Geodatabase (.mdb); a seamless regional Total Field colour aeromagnetic map and 2 shaded regional Total Field aeromagnetic maps, shaded from 45° and 315°, all showing the publicly available high-resolution aeromagnetic coverage across some greenstone belts, embedded in the images.

Note:

Apart from the Jurassic-aged kimberlite pipes of the Attawapiskat cluster, all intrusive rocks within the James Bay and Hudson Bay lowlands (see Stott 2008a, b and c), underlie the Paleozoic cover rocks of the lowlands.

Acknowledgements

Appreciation for their ongoing discussions and comments is extended to Ken Buchan (Geological Survey of Canada), Richard Ernst (Ernst Geosciences; Carleton University), Mike Hamilton (Jack Satterly Geochronology Laboratory, University of Toronto), and Henry Halls, (University of Toronto). W.J Davis (Geological Survey of Canada) and M.A. Hamilton (Jack Satterly Geochronology Laboratory, University of Toronto) are acknowledged for 2 separate, unpublished age determinations.

Using the data with ArcGIS ® software:

The data may be accessed with ESRI ® ArcGIS ® 8.3, and 9.2 or 9.3 software.

• Copy the MRD241 folder to your hard drive from the DVD. Alternately, make a new folder on your hard drive and copy all folders within the MRD241 directory to your new folder.

• For each newly copied folder right-click and uncheck the Read-only option check box so files may be edited.

• The '\\Font folder contains the font file OGSFaults.TTF required by ArcGIS for symbolizing the directional arrows on the sinistral and dextral faults. This font should be installed prior to viewing the (.mxd) files in ArcMap. It can be installed by simply copying it to your \\Windows\Font directory.

• Use ArcGIS to open any of the project files (.mxd), found on the DVD. Please note that at full map extent, regeneration time for some layers may be slow.

• The annotation is stored in a Geodatabase format for the 9.2 version. The annotation is stored as annotation within the (.mxd) if using ArcGIS 8.3.

Map Projections, Scale and Base Map Information:

All spatial data and geophysical images on the DVD are projected in decimal degrees, North American datum of 1983. (GCS North American 1983, D North American 1983).

The (.mxd) data frame is projected in Lambert Conic Conformal for display and printing purposes.

The base map, with the exception of the Lakes and Rivers, is the Ministry of Natural Resources’ Land Information Ontario / Natural Resource Values Information System base map. The rivers were digitized from LandSat images and the Lakes are a combination of the Ministry of Natural Resources’ Land Information Ontario / Natural Resource Values Information System, LandSat images, and Natural Resources Canada. Users should be aware that, although extensive revisions were performed by staff of the MNDM, the quality of the topographic base may vary from place to place, due to the differences in age and quality of the topographic information available from the various sources.

Sources of Information

Digital base map information derived from the Ontario Land Information Warehouse, Land Information Ontario, Ontario Ministry of Natural Resources, scale 1:20 000, and from 1:50 000 scale maps of the National Topographic System (NTS), with modifications by staff of the Ministry of Northern Development and Mines.

The geological data is in part from Stott et al. 2008, OGS 2006 and Buchan and Ernst 2004. See References.

Credits

Geological interpretation by G.M. Stott and S. Josey, 2008-2009.

Preparation of base map and digital cartography by S. Josey.

Contents of the DVD

Legend

PRECAMBRIAN

MESOPROTEROZOIC 35 Alkalic Intrusive Suite and Carbonatite (circa 1.1 to 1.2 Ga): Alkalic syenite, ijolite, associated mafic and ultramafic rocks, and minor carbonatite 35a Martison Carbonatite Complex

34 Mafic Dikes and Related Intrusive Rocks (circa 1.1 to 1.2 Ga) 34a Nipigon mafic sills circa 1100-1115 Ma) 34b Mafic sills and dikes (circa 1130-1180), including the Mine Centre dike (circa 1137±20 Ma), the Empey Lake dike (circa 1178±31 Ma), and the Kipling (Abitibi) dike (circa 1140 Ma). 34c Ultramafic, gabbroic and granophyric intrusions (probably related to 35a)

33 Mafic Dikes 33a Mackenzie mafic dike swarm (1267 Ma) 33b Sudbury mafic dike swarm (ca. 1235-1238)

PALEOPROTEROZOIC

27 Carbonatite-Alkalic Intrusive Suite (circa 1.8 to 1.9 Ga): Carbonatite complex and associated rocks

26 Mafic Dikes and Sills 26a Sutton Inliers: gabbroic sills of the Molson event (circa 1871 Ma) 26b Pickle Crow mafic dike; normally magnetized northwest-trending subswarm (Molson swarm) (circa 1876 Ma) 26c Pickle Crow mafic dike; reversely magnetized northwest-trending subswarm (Molson swarm) (circa 1876 Ma) 26d Mafic dikes of uncertain age, including west-northwest-trending Wabigoon dike

23 Mafic Dikes 23a Marathon mafic dike; north-northwest to north-northeast-trending subswarm (circa 2101 to 2126 Ma) 23b Fort Frances mafic dike; northwest trending subswarm (circa 2075 Ma) 23c Marathon, Kapuskasing or Biscotasing mafic dike; northeast-trending subswarm (circa 2101-2126 or circa 2167-2171 Ma) 23d Biscotasing mafic dike; north-northeast-trending swarm (circa 2167-2171 Ma)

17 Mafic Dikes 17a Matachewan mafic dike; northwest-trending swarm (circa 2454 Ma)

References

(those in italics provide reference to radiometric age determinations of units on this map)

Buchan, K.L. and Ernst, R.E. 2004. Diabase dyke swarms and related units in Canada and adjacent regions; Geological Survey of Canada, Map 2022A, scale 1:5 000 000 with accompanying notes.

Buchan, K.L., Halls, H.C. and Mortensen, J.K. 1996. Paleomagnetism, U-Pb geochronology and geochemistry of Marathon dykes, Superior Province, and comparison with the Fort Frances swarm; Canadian Journal of Earth Sciences, v.33, p.1583-1595.

Buchan, K.L., Harris, B.A., Ernst, R.E. and Hanes, J.A. 2003. Ar-Ar dating of the Pickle Crow diabase dike in the western Superior craton of the Canadian Shield of Ontario and implications for a possible plume centre associated with ca. 1880 Ma Molson magmatism of Manitoba; in Abstracts, Annual Meeting of the Geological Association of Canada, Mineralogical Association of Canada, Society of Economic Geologists, Vancouver, Canada (published as CD and printed volume), v.28, p.17.

Buchan, K.L., Mortensen, J.K., and Card, K.D. 1993. Northeast-trending Early Proterozoic dykes of southern Superior Province: multiple episodes of emplacement recognized from integrated paleomagnetism and U-Pb geochronology. Canadian Journal of Earth Sciences, 30: 1286-1296.

Easton, R.M. 2001. Geochronology data for Ontario; Ontario Geological Survey, Miscellaneous Release-Data 75.

Ernst, R.E., Buchan, K.L., Heaman, L.M., Hart, T.R. and Morgan, J. 2006. Multidisciplinary study of north- to north-northeast-trending dikes in the region west of the Nipigon Embayment: Lake Nipigon Region Geoscience Initiative; Ontario Geological Survey, Miscellaneous Release--Data 194.

Geological Survey of Canada 2003. Canadian aeromagnetic data base; Regional Geophysics Section, Geological Survey of Canada, Earth Sciences Sector, Natural Resources Canada.

Halls, H.C., and Davis, D.W. 2004. Paleomagnetism and U-Pb geochronology of the 2.17 Ga Biscotasing dyke swarm, Ontario, Canada: evidence for vertical-axis crustal rotation across the Kapuskasing Zone. Canadian Journal of Earth Sciences, 41: 255-269.

Halls, H.C., Davis, D.W., Stott, G.M., Ernst, R.E. and Hamilton, M.A. 2008. The Paleoproterozoic Marathon Large Igneous Province: New evidence for a 2.1 Ga long-lived mantle plume event along the southern margin of the North American Superior Province; Precambrian Research, v.162, p.327-353.

Halls, H.C., Stott, G.M. and Davis, D.W. 2005. Paleomagnetism, geochronology and geochemistry of several Proterozoic mafic dike swarms in northwestern Ontario; Ontario Geological Survey, Open File Report 6171, 59p.

Hamilton, M.A. and Stott, G.M. 2008. The Significance of New U/Pb Baddeleyite Ages from Two Paleoproterozoic Diabase Dikes in Northern Ontario; in Summary of Field Work and Other Activities 2008, Ontario Geological Survey, Open File Report 6226, p.17-1 to 17-10.

Heaman, L.M. and Easton, R.M. 2006. Preliminary U-Pb geochronology results from the Lake Nipigon Region Geoscience Initiative. Ontario Geological Survey, Miscellaneous Release of Data, MRD-191.

Heaman, L.M., Easton, R.M., Hart, T.R., Hollings, P., MacDonald, C.A. and Smyk, M. 2007. Canadian Journal of Earth Sciences, v44, p.1055-1086.

Heaman, L.M. and Kjarsgaard, B.A. 2000. Timing of eastern North American kimberlite magmatism: continental extension of the Great Meteor hotspot track?; Earth and Planetary Science Letters, v.178, p.253-268.

Heaman, L.M., Kjarsgaard, B.A. and Creaser, R.A. 2004. The temporal evolution of North American kimberlites; Lithos, v.76, p.377-397.

Janse, A.J.A., Downie, I.F., Reed, L.E. and Sinclair, I.G.L. 1989. Alkaline intrusions in the Hudson Bay Lowlands, Canada: exploration methods, petrology and geochemistry; in Kimberlites and Related Rocks, v.2, Ross, J., Jaques, A.C., Ferguson, J., Green, D.H., O’Reilly, S.Y., Danchin, R.V. and Janse, A.J.A. (eds.), Geological Society of Australia, Special Publication 14, Blackwell Scientific Publications, p.1193-1203. Kong, J.M., Boucher, D.R. and Scott-Smith, B.H. 1999. Exploration and geology of the Attawapiskat kimberlites, James Bay Lowlands, northern Ontario, Canada; in Seventh International Kimberlite Conference, Extended Abstracts, Cape Town, South Africa, p.446-448.

Ontario Geological Survey 1999. Single master gravity and aeromagnetic data for Ontario; Ontario Geological Survey, Geophysical Data Set 1036.

Ontario Geological Survey 2003. Ontario airborne geophysical surveys, magnetic data, grid data, magnetic supergrids; Ontario Geological Survey, Geophysical Data Set 1037.

Ontario Geological Survey 2006. 1:250 000 scale bedrock geology of Ontario; Ontario Geological Survey, Miscellaneous Release – Data 126-Revised.

Osmani, I.A. 1991. Proterozoic mafic dike swarms in the Superior Province of Ontario; in Geology of Ontario, Ontario Geological Survey, Special Volume 4, Part 1, p.661-681.

Sage, R.P. 1985. Geology of Carbonatite – Alkalic Rock Complexes in Ontario: Chipman Lake Area, District of Thunder Bay and Cochrane; Ontario Geological Survey, Study 44, 40p.

Sage, R.P. 1987a. Geology of Carbonatite – Alkalic Rock Complexes in Ontario: James Bay Lowlands, Districts of Cochrane and Kenora; Ontario Geological Survey, Study 42, 49p.

Sage, R.P. 1987b. Geology of Carbonatite – Alkalic Rock Complexes in Ontario: Big Beaver House Carbonatite Complex, District of Kenora; Ontario Geological Survey, Study 51, 71p.

Sage, R.P. 1987c. Geology of Carbonatite – Alkalic Rock Complexes in Ontario: “Carb” Lake Carbonatite Complex, District of Kenora; Ontario Geological Survey, Study 53, 42p.

Sage, R.P. 1991. Alkalic Rock, carbonatite and kimberlite complexes of Ontario, Superior Province; in Geology of Ontario, Ontario Geological Survey, Special Volume 4, Part 1, p.683-709.

Sage, R.P. 2000. Kimberlites of the Attawapiskat area, James Bay Lowlands, northern Ontario; Ontario Geological Survey, Open File Report 6019, 341 p.

Stott, G.M. 2008a. Precambrian geology of the Hudson Bay and James Bay lowlands region interpreted from aeromagnetic data – west sheet; Ontario Geological Survey, Preliminary Map P.3597 – Revised, scale 1:500 000.

Stott, G.M. 2008b. Precambrian geology of the Hudson Bay and James Bay lowlands region interpreted from aeromagnetic data – east sheet; Ontario Geological Survey, Preliminary Map P.3598 – Revised, scale 1:500 000.

Stott, G.M. 2008c. Precambrian geology of the Hudson Bay and James Bay lowlands region interpreted from aeromagnetic data – south sheet; Ontario Geological Survey, Preliminary Map P.3599, scale 1:500 000.

Stott, G.M., Josey, S.D., Rainsford, D.R.B. and McIlraith, S.J. 2008. Precambrian geology and aeromagnetic data of the Hudson Bay and James Bay lowlands region with Precambrian basement depth estimates and related tables of geochronology and diamond-drill hole data; Ontario Geological Survey, Miscellaneous Release– Data 233.