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Coldwell complex, Thunder Bay District, Ontario, Canada

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Pegmatitic syenite intruding gabbro, Coldwell alkaline complex near Marathon, Ontario

Coldwell complex, Thunder Bay District, Ontario, Canada
Syenite-gabbro contact, Coldwell alkaline complex near Marathon, Ontario

Coldwell complex, Thunder Bay District, Ontario, Canada
Close-up, pegmatitic syenite, Coldwell alkaline complex near Marathon, Ontario

Coldwell complex, Thunder Bay District, Ontario, Canada
Pegmatitic syenite intruding gabbro, Coldwell alkaline complex near Marathon, Ontario

Coldwell complex, Thunder Bay District, Ontario, Canada
Syenite-gabbro contact, Coldwell alkaline complex near Marathon, Ontario

Coldwell complex, Thunder Bay District, Ontario, Canada
Close-up, pegmatitic syenite, Coldwell alkaline complex near Marathon, Ontario

Coldwell complex, Thunder Bay District, Ontario, Canada
Pegmatitic syenite intruding gabbro, Coldwell alkaline complex near Marathon, Ontario

Coldwell complex, Thunder Bay District, Ontario, Canada
Syenite-gabbro contact, Coldwell alkaline complex near Marathon, Ontario

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 List

Mineral list contains entries from the region specified including sub-localities

Actinolite

Aegirine

Aenigmatite

Albite

Allanite-(Ce)

Altaite

Analcime

Andradite

Anduoite

Annite

Arfvedsonite

Arsenopalladinite

Arsenopyrite

Atokite

Augite

Baddeleyite

Bastnäsite-(Ce)

'Biotite'

Bogdanovite

Böhmite

Bornite

Braggite

Britholite-(Ce)

Calcite

Cancrinite

Chalcocite

Chalcopyrite

Chekhovichite

Cherepanovite

Chevkinite-(Ce)

'Chlorite Group'

Cobaltite

Cobaltpentlandite

Coldwellite (TL)

Cotunnite

Crichtonite

Cubanite

Diopside

Dolomite

Edenite

Elpidite

Empressite

Enstatite

Epidote

'Fayalite-Forsterite Series'

Fergusonite-(Y)

'Ferro-barroisite'

Ferro-edenite

Ferro-hornblende

Ferro-pargasite

Ferrorhodsite

Ferro-richterite

'Ferro-winchite'

Fersmite

Fluorapatite

Fluorite

Forsterite

Froodite

Galena

Gold

Hastingsite

Hedenbergite

Hematite

Hessite

Hollingworthite

Ilmenite

Irarsite

Isoferroplatinum

Isomertieite

Kaersutite

Keithconnite

Kotulskite

Kravtsovite

Laflammeite

Laurite

Mackinawite

Magnesio-hastingsite

Magnesio-hornblende

Magnetite

Majakite

Marathonite (TL)

Meionite

Melonite

Menshikovite

Merenskyite

Mertieite-II

Michenerite

Microcline

Millerite

Monazite-(Ce)

Moncheite

Muscovite

Naldrettite

Natrolite

Nepheline

Niggliite

'Olivine'

Olsacherite

Padmaite

Palarstanide

Palladium

Palladoarsenide

Palladobismutharsenide

Palladodymite

Palladogermanide (TL)

Paolovite

Pargasite

Parisite-(Ce)

Pentlandite

Phenakite

Pintadoite

Platarsite

Platinum

Plumbopalladinite

Pyrite

Pyrochlore Group

Pyrrhotite

Quartz

Rhodarsenide

Riebeckite

Röntgenite-(Ce)

Ruarsite

Rustenburgite

Rutile

Siegenite

Silver

Skaergaardite

Sobolevskite

Sodalite

Sopcheite

Sperrylite

Sphalerite

Stibiopalladinite

Stillwaterite

Stützite

Sudburyite

Synchysite-(Ce)

Talc

Tarkianite

Telargpalite

Tetra-auricupride

Tetraferroplatinum

'Thomsonite'

Thorite

Titanite

Törnroosite

Tulameenite

Vasilite

Vincentite

Vysotskite

Yecoraite

Zircon

Zirconolite

Zvyagintsevite


147 valid minerals. 3 (TL) - type locality of valid minerals.

Regional Geology

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

Mesoproterozoic
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

Lithology: Alkalic syenite, ijolite, nepheline syenite, fenite, associated mafic and ultramafic rocks, and minor carbonatite

Reference: Ontario Geological Survey. 1:250 000 scale bedrock geology of Ontario. ISBN 978-1-4435-5705-4. Miscellaneous Release–Data 126 - Revision 1. [1]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License


Localities in this Region

Canada

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Puskas, F.P. (1967) Geology of the Port Coldwell area, District of Thunder Bay. Ontario Department of Mines, Geological Circular 10, 81 p.

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.








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