Ontario Geological Survey
Permanent Link to this Record:
MDI52C10NE00024
| Record Name(s) | Bad Vermilion Anorthosite - 1990 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1990-Dec-08 |
| Date Last Modified | 2022-Sep-27 |
| Created By | |
| Revised By |
Primary Commodities: Anorthosite
Secondary Commodities: Titanium
Township or Area: Bad Vermilion Lake Area
Latitude: 48° 43' 29.71" Longitude: -92° 40' .5"
UTM Zone: 15 Easting: 524504.658 Northing: 5396930.762 UTM Datum: NAD83
Resident Geologist District: Kenora
NTS Grid: 52C10NE
Point Location Description: Outcrop in the vicinity of Finger and Island Bays
Location Method: Conversion from MDI
Access Description: The Bad Vermilion Lake intrusion is situated approximately 50 km east of Fort Frances in northwestern Ontario. It covers an area of 100 km2, straddling Bad Vermilion Lake and extending southwest to Seine Bay on Rainy Lake. The body is accessible via the town of Mine Centre on Highway 11, and Bad Vermilion Lake.
All previous exploration work in the area was for titanium and gold. 1992: As part of a province-wide strategy to sample and evaluate anorthosite complexes, the Industrial Minerals Geologist for Northwestern Ontario conducted reconnaissance sampling. A total of 14 samples were taken and analysed for their major element chemistry. Results indicated that the anorthosite samples collected did not meet the chemical criteria for alumina leaching. No further work has been done.
Province: Superior
Subprovince: Wabigoon
Belt: Fort Frances-Mine Centre
Geological Age: Late Precambrian Geochronological Age: 2600MA Geochron. Age Ref.: ASHWAL, L.D., ET AL, 1983
Dec 07, 2005 (P Hinz) - The Bad Vermilion Lake anorthosite occurs within a differentiated anorthositic-gabbroic intrusion. The area surrounding the intrusion was mapped by Wood et al. (1980) and a preliminary map was produced. The overall intrusion is exposed over approximately 30 km, with the most promising anorthosite outcrops occurring in the northeast portion of the intrusion. A study conducted by Ashwal et al. (1983) concentrated on the Seine Bay (southwestern) portion of the intrusion and did not sample the more massive northeastern portion. The intrusion is a composite and possibly differentiated intrusive body approximately 25 km long and 7 km wide; its long axis strikes northeast. The elongate lobe that traverses along the northwestern shore of Bad Vermilion Lake and the north shore of Seine Bay represents the northernmost portion of the intrusion; this lobe consists of medium-grained equigranular gabbro. South and east from this gabbroic lobe the content of modal plagioclase increases; we observed a transition from gabbro to anorthositic (quartz) gabbro to gabbroic anorthosite to true anorthosite. The best examples of the latter that we observed occur in the north-central portion of the intrusion along the lake shore in the general vicinity of Finger and Island Bays. Gabbro also occurs in other portions of the intrusion, suggesting a periodic layered character; a composite, episodically-intrusive character; or a combination of both. The intrusion locally contains rafted blocks of mafic volcanics, and is cross-cut by Proterozoic diabase dykes. Outcrop exposures on the western shoreline were primarily gabbro to gabbroic anorthosite. Some shearing was observed and pods of titanomagnetite were noted. One such pod was sampled (IM-92-001) and analysed for its TiO2 content. Outcrops to the east contained an increased amount of anorthosite. The following west to east sequence was observed: gabbro; anorthositic gabbro; gabbroic anorthosite; massive anorthosite.
Dec 07, 2005 (R Degagne) - The Bad Vermilion Lake anorthosite occurs within a differentiated anorthositic-gabbroic intrusion. The area surrounding the intrusion was mapped by Wood and a preliminary map was produced. The overall intrusion is exposed over approximately 30 km, with the most promising anorthosite outcrops occurring in the northeast portion of the intrusion. A study conducted by Ashwal et al. (1983) concentrated on the Seine Bay (southwestern) portion of the intrusion and did not sample the more massive northeastern portion. The intrusion is a composite and possibly differentiated intrusive body approximately 25 km long and 7 km wide; its long axis strikes northeast. The elongate lobe that traverses along the northwestern shore of Bad Vermilion Lake and the north shore of Seine Bay represents the northernmost portion of the intrusion; this lobe consists of medium-grained equigranular gabbro. South and east from this gabbroic lobe the content of modal plagioclase increases; we observed a transition from gabbro to anorthositic (quartz) gabbro to gabbroic anorthosite to true anorthosite. The best examples of the latter that we observed occur in the north-central portion of the intrusion along the lake shore in the general vicinity of Finger and Island Bays. Gabbro also occurs in other portions of the intrusion, suggesting a periodic layered character; a composite, episodically-intrusive character; or a combination of both. The intrusion locally contains rafted blocks of mafic volcanics, and is cross-cut by Proterozoic diabase dykes. Outcrop exposures on the western shoreline were primarily gabbro to gabbroic anorthosite. Some shearing was observed and pods of titanomagnetite were noted. One such pod was sampled (IM-92-001) and analysed for its TiO2 content. Outcrops to the east contained an increased amount of anorthosite. The following west to east sequence was observed: gabbro; anorthositic gabbro; gabbroic anorthosite; massive anorthosite.
| Rock Type | Rank | Composition | Texture | Relationship | Anorthosite | 1 | Massive | Host |
|---|---|---|---|---|
| Anorthosite | 2 | Gabbroic | Host | |
| Gabbro | 3 | Gabbro | Equigranular | Host |
| Gabbro | 4 | Anorthositic (Quartz) | Host |
Dec 07, 2005 (R Degagne) - Outcrop exposures on the western shoreline were primarily gabbro to gabbroic anorthosite. Some shearing was observed and pods of titanomagnetite were noted. One such pod was sampled (IM-92-001) and analysed for its TiO2 content. Outcrops to the east contained an increased amount of anorthosite. The following west to east sequence was observed: gabbro; anorthositic gabbro; gabbroic anorthosite; massive anorthosite. Each rock-type represented an increase in modal plagioclase content.
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Plagioclase | Economic | Ore | ||||
| Chlorite | Alteration | Chloritic | 1 | Replacement | |||
| Epidote | Alteration | Saussuritization | 2 | Replacement |
Dec 07, 2005 (P Hinz) - Plagioclase content was above 90% and in some places it neared 95%. Cumulate crystals up to 10 cm were seen and outcrops had a golf-ball like appearance. Intercumulate chlorite was seen and could represent altered mafic minerals (amphibole/pyroxene). Epidote was noted and may indicate the presences of saussuritization.
Dec 07, 2005 (R Degagne) - Plagioclase content was above 90% and in some places it neared 95%. Cumulate crystals up to 10 cm were seen and outcrops had a golf-ball like appearance. Intercumulate chlorite was seen and could represent altered mafic minerals (amphibole/pyroxene). Epidote was noted and may indicate the presences of saussuritization.
Dec 07, 2005 (R Degagne) - Intercumulate chlor may represent altered mafic mins (amph/pyx). Epidote may indicate saussuritization. IM-92-001 -- Al2O3, -- CaO, -- Fe2O3, --MgO, -- Na2O, -- K2O, -- SiO2 -- MnO, 13.0 TiO2, -- P205; IM-92-002 23.0 Al2O3, 9.42 CaO, 3.86 Fe2O3, 1.06 MgO, 5.62 Na2O, 0.40 K2O, 53.2 SiO2, 0.06 MnO, 0.18 TiO2, 0.04 P205; IM-92-003 21.8 Al2O3, 13.4 CaO, 6.95 Fe2O3, 2.44 MgO, 3.07 Na2O, 0.07 K2O, 47.5 SiO2, 0.10 MnO, 0.43 TiO2, 0.06 P205; IM-92-004 13.5 Al2O3, 4.44 CaO, 3.91 Fe2O3, 0.81 MgO, 4.68 Na2O, 0.43 K2O, 69.1 SiO2, 0.05 MnO, 0.48 TiO2, 0.11 P205; IM-92-005 29.7 Al2O3, 13.2 CaO, 2.90 Fe2O3, 2.14 MgO, 2.31 Na2O, 1.36 K2O, 45.7 SiO2, 0.04 MnO, 0.08 TiO2, 0.02 P205; IM-92-006 27.7 Al2O3, 12.7 CaO, 3.59 Fe2O3, 3.11 MgO, 3.08 Na2O, 0.20 K2O, 45.8 SiO2, 0.05 MnO, 0.15 TiO2, 0.02 P205; IM-92-007 28.0 Al2O3, 12.3 CaO, 4.85 Fe2O3, 4.12 MgO, 2.24 Na2O, 0.35 K2O, 43.7 SiO2, 0.07 MnO, 0.17 TiO2, 0.02 P205; IM-92-008 27.4 Al2O3, 18.1 CaO, 3.18 Fe2O3, 1.47 MgO, 1.86 Na2O, 0.02 K2O, 45.4 SiO2, 0.05 MnO, 0.10 TiO2, 0.02 P205; IM-92-009 25.6 Al2O3, 14.8 CaO, 4.72 Fe2O3, 3.48 MgO, 1.49 Na2O, 0.07 K2O, 46.0 SiO2, 0.07 MnO, 0.13 TiO2, 0.02 P205; IM-92-010 27.0 Al2O3, 17.4 CaO, 4.08 Fe2O3, 1.85 MgO, 1.21 Na2O, 0.10 K2O, 45.8 SiO2, 0.05 MnO, 0.12 TiO2, 0.02 P205; IM-92-011 27.8 Al2O3, 12.7 CaO, 3.30 Fe2O3, 1.63 MgO, 3.27 Na2O, 0.96 K2O, 47.7 SiO2, 0.05 MnO, 0.25 TiO2, 0.03 P205; IM-92-029 27.7 Al2O3, 16.7 CaO, 3.15 Fe2O3, 2.24 MgO, 1.68 Na2O, 0.07 K2O, 45.7 SiO2, 0.07 MnO, 0.32 TiO2, 0.04 P205; IM-92-030 26.7 Al2O3, 12.7 CaO, 5.60 Fe2O3, 4.67 MgO, 1.49 Na2O, 0.09 K2O, 45.2 SiO2, 0.07 MnO, 0.08 TiO2, 0.02 P205; IM-92-031 28.0 Al2O3, 12.8 CaO, 3.05 Fe2O3, 2.19 MgO, 2.43 Na2O, 0.60 K2O, 44.2 SiO2, 0.05 MnO, 0.26 TiO2, 0.02 P205; Braaten 30.5 Al2O3, 14.0 CaO, 1.20 Fe2O3, 0.50 MgO, 2.40 Na2O, 0.10 K2O, 50.9 SiO2, 0.08 MnO, 0.02 TiO2, Ashwal 31.1 Al2O3, 14.9 CaO, 0.89 Fe2O3, 0.93 MgO, 2.91 Na2O, 0.12 47.6 K2O, 0.01 SiO2, 0.07 MnO 0.03 TiO2, IM-92 smpl analyses by Geoscience Labs, OGS.
| Shape | Length | Thickness | Depth | Strike | Dip | Plunge | Trend | Age | Reference |
|---|---|---|---|---|---|---|---|---|---|
| Tabular |
Date: Dec 13, 1996
Geologist: R Degagne
Notes: Visited in June, 1992 by P. Hinz | R. M. Landry (OGS OFR 5889, 1994)
Book - Northern Miner 85-06-27, Barron
Publication Number: NMINER Date: 1985
Author:
Publisher Name: Northern Miner
Location: Northern Miner Magazine
Map - Geological series, Mine Centre area (western half), District of Rainy River
Publication Number: P2201 Scale: 1:15,840 Date: 1980
Author: Wood J., Keay J.P., Panagapko D.A., Dekker J., Jansen J.G.
Publisher Name: Ontario Geological Survey
Location:
Book - Northern Miner 85-08-05, Barron, p. 3
Publication Number: NMINER Date: 1985
Author:
Publisher Name: Northern Miner
Location: Northern Miner Magazine
Map - Geological series, Mine Centre area (eastern half), District of Rainy River
Publication Number: P2202 Scale: 1:15,840 Date: 1980
Author: Wood J., Keay J.P., Panagapko D.A., Dekker J., Jansen J.G.
Publisher Name: Ontario Geological Survey
Location:
Book - Northern Miner 86-12-08, Barron, p. 7
Publication Number: NMINER Date: 1986
Author:
Publisher Name: Northern Miner
Location: Northern Miner Magazine
Part - Mineral developments in N.W. Ontario
Publication Number: ARV27-01.005 Page: Part 1, facing p 172 Date: 1998
Author: Parsons A.L.
Publisher Name: Ontario Bureau of Mines
Location:
Mono - An evaluation of the industrial mineral potential of parts of the districts of Kenora and Rainy River
Publication Number: OFR5718 Page: 172-175 Date: 1990
Author: Storey C.C.
Publisher Name: Ontario Geological Survey
Location:
Book - ORIGIN OF ARCHEAN ANORTHOSITES, MINERALOGY AND PETROLOGY, P. 259 - 273.
Publication Number: N/A Date: 1983
Author: Ashwal, L. D. et al
Publisher Name:
Location: CONTRIBUTIONS TO MIN. AND PETROLOGY
Book - O.B.M., V. 5, S.2, SECOND REPORT ON THE GOLD FIELDS OF WESTERN ONTARIO, P.47-106
Publication Number: N/A Date: 1896
Author: Coleman, A. P.
Publisher Name:
Location: Ontario Bureau Of Mines
MonoMap - Geology of the Rainy Lake area, District of Rainy River
Publication Number: R115 Page: 28-29 Date: 1974
Author: Harris F.R.
Publisher Name: Ontario Division of Mines
Location:
Compend - Report of activities, 1991, Resident Geologists
Publication Number: MP158 Page: 165-180 Date: 1992
Author: Fenwick K.G., Newsome J.W., Pitts A.E.
Publisher Name: Ontario Geological Survey
Location:
Book - O.B.M. 1918, AR 1918, PT.1, V. 27, IRON AND COPPER DEPOSITS NEAR MINE CENTRE
Publication Number: N/A Date: 1918
Author: Parsons, A.L.
Publisher Name:
Location: Ontario Bureau Of Mines
Mono - Industrial Mineral Occurrences and Deposits in Northwest Ontario
Publication Number: OFR5889 Page: 8-12 Date: 1994
Author: Hinz P., Landry R.M.
Publisher Name: Ontario Geological Survey
Location:
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