Coldwell complex, Thunder Bay District, Ontario, Canada
|Latitude & Longitude (WGS84):||48° 47' 54'' North , 86° 39' 6'' West|
|Latitude & Longitude (decimal):||48.79861,-86.65167|
Located on the north shore of Lake Superior the Coldwell complex is the largest alkaline complex in North America, with an approximate area of 1500 km².
Coordinates are for the outcrop photos along Highway 17 shown. This zircon http://www.mindat.org/photo-476919.html was found about 400m east of this location in an old abandoned road cut parallel and north of the new highway.
Mineral ListMineral list contains entries from the region specified including sub-localities
147 valid minerals. 3 (TL) - type locality of valid minerals.
This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.
Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org
1000 - 1600 Ma
|Alkalic Intrusive Suite and Carbonatite (circa 1.1 to 1.2 Ga)|
Age: Mesoproterozoic (1000 - 1600 Ma)
Comments: Southern and Superior Province
Reference: Ontario Geological Survey. 1:250 000 scale bedrock geology of Ontario. ISBN 978-1-4435-5705-4. Miscellaneous Release–Data 126 - Revision 1. 
Localities in this Region
- Thunder Bay District
- Coldwell complex
- Thunder Bay District
Currie, K.L. (1976) The alkaline rocks in Canada. GSC Bulletin 239, 238 p.
Mitchell, R.H. & Platt, R.G. (1978) Mafic mineralogy of ferroaugite syenite from the Coldwell alkaline complex, Ontario, Canada. Journal of Petrology, 19, 627-65 1.
Currie, K.L. (1980) A contribution to the petrology of the Coldwell alkaline complex,Northen Ontario. GSC Bulletin 237,43 p.
Mitchell, R.H. (1982) Mineralogy and petrology of nepheline syenites from the Coldwell alkaline complex, Ontario, Canada. Journal of Petrology, 23, 186-214.
Platt, R.S. & MitchellL, R,H. (1982) Rb-Sr geochronology of the Coldwell complex, N.W. Ontario, Canada. Canadian Journal of Earth Sciences, 19: 1797-1801.
Platt & Mitchell (1982)[title?] Journal of Petrology 23, 186-214.
Mitchell, R.H., Platt, R. G. and Cheadles, P. (1983) A gravity study of the Coldwell complex, northwestern Ontario, and its petrological significance. Canadian Journal of Earth Sciences, 20, 1631-1638.
Wilkinson, S.J. (1983) Geology and sulphide mineralization of the marginal phases of the Coldwell Complex, northwestern Ontario, M.Sc. Thesis, Carleton University, Ottawa, Canada. 129 p.
Laderoute, D.G. (1988) The petrography, geochemistry and petrogenesis of alkaline dike rocks from the Coldwell alkaline complex, northwestern Ontario. M.Sc. thesis, Lakehead University, Thunder Bay, Ont.
Lukosius-Sander, J.S. & Mitchell, R.H. (1988) Petrology of syenites from Center I11 of the Coldwell alkaline complex, northwestern Ontario. Geological Association of Canada – Mineralogical Association of Canada, Program with Abstracts, 13: A75.
Mclaughlin, R.M. & Mitchell, R.H. (1989) Rare metal mineralization in the Coldwell alkaline complex, northwestern Ontario. Geological Association of Canada - Mineralogical Association of Canada, Program with Abstracts, 14: Al.
Mulja, T. & Mitchell, R.H. (1990) Platinum-group minerals and tellurides from the Geordi Lake intrusion, Coldwell complex, Northwestern Ontario. Canadian Mineralogist 28, 489-501.
McLaughlin (1990) [title?] Unpublished M.Sc. thesis Lakehead U.
Mitchell (1991) [title?]Canadian Journal of Earth Sciences 28, 1653-1663.
Franklin, J M, Schnieders, B R, & Koopman, E R (1991) Mineral Deposits in the western Superior Province, Ontario (Field Trip 9) Geological Survey of Canada, Open File 2164
Watkinson, D.H. & Ohnenstetter, D. (1992) Hydrothermal origin of platinum-group mineralization in the Two Duck Lake Intrusion, Coldwell Complex, northwestern Ontario. Canadian Mineralogist, 30, 121-136.
Tschernich, R. (1992): Zeolites of the World, p.458.
Ames, D.E., Kjarsgaard, I.M., McDonald, A.M. & Good, D.J. (2017) Insights into the extreme PGE enrichment of the W Horizon, Marathon Cu-Pd deposit, Coldwell Alkaline Complex, Canada: Platinum-group mineralogy, compositions and genetic implications. Ore Geplogy Reviews 2017, xx-xx.