Ontario Geological Survey
Permanent Link to this Record:
MDI000000001708
| Record Name(s) | Allan Lake Carbonatite - 1988 |
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| Related Record Type | |
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| Record Status | Discretionary Occurrence |
| Date Created | 2014-Jun-03 |
| Date Last Modified | 2023-Jun-07 |
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| Revised By |
Primary Commodities: Rare Earth Elements, Cerium, Lanthanum, Yttrium
Secondary Commodities: Thorium, Niobium
Township or Area: Fitzgerald
Latitude: 46° 5' 41" Longitude: -78° 15' 4"
UTM Zone: 17 Easting: 712486.31 Northing: 5108245.76 UTM Datum: NAD83
Resident Geologist District: Southern Ontario
NTS Grid: 31L01SW
Point Location Description: Centre point, small, un-named lake approx 2.1 km east of Allan Lake.
Location Method: Data Compilation
Found in 1977, under GSC “Canada Uranium Reconnaissance Program” by an airborne gamma-ray spectrometric survey. Subsequent diamond drilling – 1 hole.
Province: Grenville
Subprovince: Central Gneiss Belt
Geological Age: Mesoproterozoic
| Rock Type | Rank | Composition | Texture | Relationship | Carbonatite-Unsubdivided | 1 | Is |
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Jun 07, 2023 (Q Unknown) - 1000m x 400m, largely unexposed, ankeritic-sideritic, REE-enriched carbonatite. Found in 1977, under GSC “Canada Uranium Reconnaissance Program” by an airborne gamma-ray spectrometric survey; 5km line-spacing indicated equiv Th peak / no corresponding equiv U peak or magnetic signature. Minor phases include biotite silico-carbonatite, orthoclase-dolomite carbonatite, apatite-rich carbonatite and narrow zones of intense chloritization. A poorly exposed fenitized aureole dominated by abundant hematitic veining and minor acmite-bearing veins grades into a brecciated border zone surrounding the carbonatite. Radial, breccia, lamprophyre and hematite-rich dykes are present within the fenitic aureole. Glacial erosion produced a dispersal train of lithologically distinctive till covering an area of approximately 10 km2 and characterized by anomalous (10–20 times background), concentrations of Ba, Nb, Th, Ce, La, Zn, Mn and Fe; and elevated (5–10 times background) concentrations of Y, P, Cu, Pb, Mo, Co and U. Dispersal train was detectable by airborne and ground gamma-ray spectrometry, till geochemistry, boulder mapping and biogeochemistry.
| Rank | Classification |
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| 1 | Carbonatite |
| Rank | Characteristic |
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| 1 | Discordant |
Journal - Geological, geophysical and geochemical studies around the Allan Lake carbonatite, Algonquin Park, Ontario, Journal of Exploration Geochemistry. pp 99-122
Publication Number: Vol. 30 Date: 1988
Author: Ford, K.L.
Publisher Name: Elsevier
Location: Tweed, RGO
Publication - Exploration geophysics for intrusion-hosted rare earth metals; Geological Survey of Canada, Open File 6828
Publication Number: GSC OF 6828 Date: 2011
Author: Thomas, M.D., Ford, K.L., Keating, P.
Publisher Name: Geological Survey of Canada
Location: https://doi.org/10.4095/288092
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