Ontario Geological Survey
Permanent Link to this Record:
MDI52E10SW00028
| Record Name(s) | Labyrinth Bay - 1886 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1991-Jan-23 |
| Date Last Modified | 2022-Mar-04 |
| Created By | |
| Revised By |
Primary Commodities: Serpentinite, Soapstone
Township or Area: Shoal Lake Area
Latitude: 49° 36' 26.88" Longitude: -94° 49' 51.01"
UTM Zone: 15 Easting: 367727.62 Northing: 5496598.4 UTM Datum: NAD83
Resident Geologist District: Kenora
NTS Grid: 52E10SW
Point Location Description: Transfer
Location Method: Conversion from MDI
No assessment reports were found on file.
Province: Superior
Subprovince: Wabigoon
Geological Age: Archean
| Rock Type | Rank | Composition | Texture | Relationship | Peridotite | 1 | Serpentinized Peridotite | Is |
|---|---|---|---|---|
| Gabbro | 2 | Near | ||
| Mafic lava flow-unsubdivided | 3 | Contains |
May 28, 2020 (Therese Pettigrew) - Davies (1978) described the altered peridotite as follows: "The peridotite weathers dark brown and is greenish black on the weathered surface. It consisted of equidimensional olivine grains 0.1 to 1.0 mm across which were surrounded by pyroxene and primary amphibole. The olivine has been completely serpentinized and the pyroxene has been chloritized. Magnetite, released during the alteration, is disseminated throughout the chloritized interstitial material and has also developed in some of the serpentinized olivine." The ultramafic rock unit is a thin sill 75 m thick and of undetermined strike length trending 075 degrees. The sill is hosted by mafic metavolcanic flows. The rock is dark green to black on the fresh surface and weathers brown. It is cut by numerous veins of white weathering asbestiform material. These veins are well developed near the north contact of the sill. The sill comprises a lower unit of serpentinized peridotite and an upper unit of massive gabbro (Storey, 1986).
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Serpentine | Economic | Ore | ||||
| 1 | Olivine | Economic | Gangue | ||||
| 2 | Pyroxene | Economic | Gangue | ||||
| 3 | Magnetite | Economic | Gangue |
Publication - Report on the Geology of the Lake of the Woods Region; Geological Survey of Canada, Annual Report vol. 1 (1885), part CC
Publication Number: GSC AR Vol 1 Scale: Date: 1886
Author: Lawson, A.C.
Publisher Name: Geological Survey of Canada
Location: https://doi.org/10.4095/297067
MonoMap - Geology of the Shoal Lake-Western Peninsula area, District of Kenora
Publication Number: OFR5242 Scale: Date: 1978
Author: Davies J.C.
Publisher Name: Ontario Geological Survey
Location:
Mono - Building and ornamental stone inventory in the districts of Kenora and Rainy River
Publication Number: MDC027 Scale: Date: 1986
Author: Storey C.C.
Publisher Name: Ontario Geological Survey
Location:
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