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EIP and Content: This EIP and Content is offered by the Province of Ontario’s Ministry of Northern Development, Mines and Forestry (MNDMF) as a public service, on an “as-is” basis. Recommendations and statements of opinions expressed are those of the author or authors and are not to be construed as statement of government policy. You are solely responsible for your use of the EIP and its Content. You should not rely on the Content for legal advice nor as authoritative in your particular circumstances. Users should verify the accuracy and applicability of any Content before acting on it. MNDMF does not guarantee, or make any warranty express or implied, that the Content is current, accurate, complete or reliable or that the EIP is free from viruses or other harmful components. MNDMF is not responsible for any damage however caused, which results, directly or indirectly, from your use of the EIP or the Content. MNDMF assumes no legal liability or responsibility for the EIP or the Content whatsoever. Links to Other Web Sites: This EIP or the Content may contain links, to Web sites that are not operated by MNDMF. Linked Web sites may not be available in French. MNDMF neither endorses nor assumes any responsibility for the safety, accuracy or availability of linked Web sites or the information contained on them. The linked Web sites, their operation and content are the responsibility of the person or entity for which they were created or maintained (the “Owner”). Both your use of a linked Web site, and your right to use or reproduce information or materials from a linked Web site, are subject to the terms of use governing that particular Web site. Any comments or inquiries regarding a linked Web site must be directed to its Owner. Copyright: Canadian and international intellectual property laws protect the EIP and the Content. Unless otherwise indicated, copyright is held by the Queen’s Printer for Ontario. It is recommended that reference to the Content be made in the following form: Buse, S., Lewis, D. and Magnus, S. 2010. Precambrian geology of the Lumby Lake greenstone belt; Ontario
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py
py,po
po,py
py,po
py,po
po,py
py,po
py,po,sp
py,po,cp
py,po,sp
py,po,cp
py,sp,cp
apy,py,cp
qc
py
py
py
py
py
qc
py
qc
or
or
ep
py
slf
slf
slf
slf
ank
slf
ser
slf
ank
ank
py,qc
py,qc
ser,qc
po,hbl
ser,qc
py,ser
py,sp,qc
po,py,qc
py,ank,ser
py
py
py
py
py,cp,qc
pl
pl
py
pl
plep
plpl
ep
bt
pl
ep
ep
pl
ep
pl
ep
pl
ep
ep
pl
ep
pl
pl
pl
pl
pl
pl
pl
pl
pl
pl
pl
ep
pl
pl
slf
ank
slf
ank
kfs
ank
ank
ser
ank
slf
slf
ank
slf
slf
slf
slf
slf
slfank
slf
slf
slf
slf
slf
tlc
slf
slfslf
slf
slfslf
slf
slf
slf
slf
slf
slf
slf
slf
ank
act
slf slf
slf
slf
slfslf
slf
slf
slf
slf
slf
slf
ank
slf
slf
slf
slf
slf
slf
slf
slf
slf
slf
ser
ser
ser
ank
chl
qtz
cal
slf
hem
mag
slf
cal
pl
ep,qtz
qtz,ep
slf,pl
ep,kfs
ep,cal
pl,slf
slf,pl
ep,qtz
ep,qtz
ser,ep
slf,ank
srp,tlc
slf,cal
slf,hem
slf,ser
chl,ser
ser,slf
ser,slf
slf,ser
pl,slf,ep
slf,ank,bt
pl,py
bt pl
ep
pl
ep
pl
slf
ank
slf
slf
slf
slf
ser
hem
grt
slf
qp,ank
qtz,ep
ank,ser
Fe
Fe
Fe
S/py
Au,Ag
Fe,mb
Cu,Zn
Zn,Pb,AuAu,Zn,Pb
8
19
20
4 5
18
16
17
21
23Ni
24Ni
25Ni
12
11
10 9
76
3
2
1
15
14
13
Au, Cu
Au Au
Au
Au
Zn
Au
Cu, Au
Cu, Au
Au
Au
Cu, Au
22Zn
1: 3001±1
2: 2897.6±2.1
3: 3014±1
4: 2963.3±4.5
5: 2828±2
G9
G5
G5
G5
G5
G5
G5
G5G5
G1
G5
G5
G9
G9
G9
G9
G9
G9
G9
G9
G9
G9G9
G9
G8
G9
G8
G8G8
G8
G8
G3
G8
G3
G3
G4
G8
G4
G4
G3
5433000 m
5434000 m
5435000 m
5436000
5432000 m
5437000 m
5438000 m
39
5440000 m
41
3635
37
34
3839
42
640000 m41
42
43
33
44
5443000 m
45
5431000 m
646000 m
32
623000 m 2425
2627
28 29630000 m
31
2221
620000 m
19
18
17
16
647000 m
15
14
613000 m
5440000 m
5431000 m
34
35
36
5432000 m
38
39
5440000 m
41
36
35
37
634000 m
38 39
42
644000 m41 42
43
633000 m
44
5443000 m
4546
632000 m
623000 m 2425
2627
2829 630000 m
5431000 m
31
622000 m
21
620000 m
19
18
17
16
647000 m
15
14
613000 m
5431000 m
37
5433000 m
91°00′00″
91°27′00″
49°04′00″
49°03′00″
49°01′00″49°01′00″
49°01′00″
90°59′00″
90°59′00″
91°12′00″
12′
91°11′00″
11′
91°10′00″
91°10′00″
49°05′00″
05′
91°20′00″
91°20′00″
49°06′00″
49°06′00″
06′
49°07′00″
49°07′00″
91°26′00″
91°26′00″
91°25′00″
91°25′00″
91°24′00″
91°24′00″
49°02′00″
49°02′00″
91°23′00″
23′
91°22′00″
22′
03′
03′
02′
02′
91°01′00″
01′
21′
91°21′00″
13′
13′
14′
14′
91°15′00″
91°15′00″
16′
16′
17′
17′
18′
18′
09′
09′
04′
04′
91°05′00″
91°05′00″
06′
06′
08′
08′
07′
07′
91°19′00″
19′
91°27′00″
04′
91°00′00″
49°03′00″
see INSET
% h0
h0%
% 0h
% 0hh0%
% 0h% 0h% h0
h0%
h0%% 0h
% 0h
SOURCES OF INFORMATIONDigital base map information derived from the Ontario Land InformationWarehouse, Land Information Ontario, Ontario Ministry of NaturalResources, scale 1:20 000, with modifications by staff of the Ministry ofNorthern Development, Mines and Forestry.
Mapping conducted using Universal Transverse Mercator (UTM)coordinates in North American Datum 1983 (NAD 83), zone 15.
Buse, S., Lewis, D. and Magnus, S. 2009. Field investigations in theLumby Lake greenstone belt, NW Ontario: New insights into the geology,structure and economic potential; in Summary of Field Work and OtherActivities 2009, Ontario Geological Survey, Open File Report 6240,p.15-1 to 15-15.
Davis, D.W. and Jackson, M.C. 1988. Geochronology of the Lumby Lakegreenstone belt: A 3 Ga complex within the Wabigoon Subprovince,northwest Ontario; Geological Society of America Bulletin, v.100,p.818-824.
Hollings, P. and Wyman, D. 1999. Trace element and Sm-Nd systematicsof volcanic and intrusive rocks from the 3 Ga Lumby Lake greenstonebelt, Superior Province: evidence for Archean plume-arc interaction;Lithos, v.46, p.189-312.
Jackson, M.C. 1985a. Geology of the Lumby Lake area, western part,districts of Kenora and Rainy River; Ontario Geological Survey,Open File Report 5534, 151p.
Jackson, M.C. 1985b. Geology of the Lumby Lake area, eastern part,districts of Kenora and Rainy River; Ontario Geological Survey,Open File Report 5535, 122p.
Kamineni, D.C., Stone, D. and Peterman, Z.E. 1990. Early Proterozoicdeformation in the western Superior Province, Canadian Shield;Geological Society of America Bulletin, v.102, p.1623-1634.
Ontario Geological Survey 2009. Airborne geophysical time domainelectromagnetic and magnetic survey, Lumby–Finlayson lakes area;Ontario Geological Survey, Geophysical Data Set 1060.
Tomlinson, K.Y., Davis, D.W., Stone, D. and Hart, T.R. 2003. U-Pb ageand Nd isotopic evidence for Archean terrane development and crustalrecycling in the south-central Wabigoon subprovince, Canada;Contributions to Mineralogy and Petrology, v.144, p.684-702.
Tomlinson, K.Y., Hughes, D.J., Thurston, P.C. and Hall, R.P. 1999. Plumemagmatism and crustal growth at 2.9 to 3.0 Ga in the Steep Rock andLumby Lake area, Western Superior Province; Lithos, v.46, p.103-136.
Woolverton, R.S. 1960. Geology of the Lumby Lake area; OntarioDepartment of Mines, Annual Report, v.69, part 5, 52p.
Wyman, D. and Hollings, P. 1998. Long-lived mantle-plume influence onan Archean protocontinent: Geochemical evidence from the 3 Ga LumbyLake greenstone belt, Ontario, Canada; Geology, v.26, no.8, p.719-722.
Assessment files from the GeologyOntario website.
Magnetic declination was approximately 1º32′W at the centre of the maparea in 2009.
Geology not tied to surveyed lines.
Users of OGS products are encouraged to contact those Aboriginalcommunities whose traditional territories may be located in the mineralexploration area to discuss their project.
Atikokan
92° 91°
49°
NeguaguonLake 25D
Seine River22A2
Sturgeon Falls23
Lac des MilleLacs 22A1Seine River
23A
=
© Queen's Printer for Ontario, 2010.
This map is published with the permission of the Director, Ontario Geological Survey.
Location Map 1 cm equals 20 km
Ontario Geological Survey
MAP P.3619
PRECAMBRIAN GEOLOGY
LUMBY LAKEGREENSTONE BELT
Scale 1:20 000
NTS References: 52 G/02, 03.
500 m 0 0.5 1 km
LEGENDab
PHANEROZOIC
CENOZOIC
QUATERNARY
RECENT Lake, stream and wetland deposits
PLEISTOCENE Glacial, glaciofluvial and glaciolacustrine deposits: sand, gravel, clay, till
UNCONFORMITY
PRECAMBRIAN
PROTEROZOIC Diabase 15a Diabase dike
UNCONFORMITY
ARCHEAN Van Nostrand Stock Composition 14a Granite 14b Granodiorite 14c Monzonite 14d Quartz monzonite
Features 14e Dike 14f Medium grained 14g Coarse grained 14h Inequigranular 14j Biotite 14k Hornblende 14m Magnetite 14n Potassium feldspar phenocrysts 14p Amphibolite xenoliths
INTRUSIVE CONTACT
Norway Lake Pluton Composition 13a Granite 13b Granodiorite 13c Tonalite 13d Monzonite 13e Quartz monzonite 13f Diorite 13g Monzodiorite 13h Quartz diorite 13j Syenite
Features 13k Pegmatitic 13m Dike 13n Medium grained 13p Coarse grained 13q Equigranular 13r Inequigranular 13s Biotite 13t Hornblende 13u Potassium feldspar phyric 13v Amphibolite xenoliths
INTRUSIVE CONTACT
Dashwa Lake Batholith Composition 12a Diorite 12b Granodiorite 12c Tonalite
Features 12d Medium grained 12e Coarse grained 12f Equigranular 12g Inequigranular 12h Biotite 12i Hornblende 12j Plagioclase phyric 12k Quartz phyric
14
15
13
12
INTRUSIVE CONTACT
Chill Lake Pluton Composition 11a Quartz monzonite 11b Tonalite
Features 11c Dike 11d Medium grained 11e Coarse grained 11f Equigranular 11g Hornblende
INTRUSIVE CONTACT
Jefferson Lake Felsic Intrusive Composition 10a Granodiorite 10b Tonalite
Features 10c Medium grained 10d Coarse grained 10e Equigranular 10f Inequigranular 10g Biotite 10h Hornblende
INTRUSIVE CONTACT
Intrusive Mafic to Ultramafic Rocks Composition 9a Gabbro 9b Melanogabbro 9c Peridotite 9d Pyroxenite 9e Hornblendite
Features 9f Magnetite 9g Asbestos 9h Plagioclase phyric 9j Talcose 9k Actinolite 9m Serpentine
INTRUSIVE CONTACT
Synvolcanic Intrusive Mafic Rocks Composition 8a Gabbro 8b Melanogabbro 8c Leucogabbro
Features 8d Plagioclase phyric 8e Actinolite 8f Magnetite
INTRUSIVE CONTACT
Synvolcanic Tonalite Composition 7a Tonalite
Features 7b Medium grained 7c Coarse grained 7d Inequigranular 7e Quartz phyric 7f Feldspar phyric 7g Amphibolite xenoliths
Carbonate Rocks Composition 6a Impure marble
Features 6b Calcareous mud beds
11
10
9
8
6
7
Ultramafic Metavolcanic Rocks Lithofacies of Flows 1a Massive flows 1b Autobreccia, flow-top breccia
Pyroclastic Deposits 1c Tuff breccia
Features 1d Spinifex textured 1e Dikes 1f Talcose 1g Cumulate 1h Organized
a This legend is based only on field investigations and is subject to change based on geochronological data.b The letter ‘G’ preceding a rock code indicates interpretation from geophysical data. The letter ‘C’ preceding a rock code indicates compilation from a previously published map.c Units 3 and 5 as drawn on the map are not the representative thicknesses of the units. Unit 3 ranges from 1 to 30 m thick and unit 5 is commonly only 1 m thick.d Interpreted to be synvolcanic and likely the same affinity as the unit 8 gabbros. These rocks were observed as coarse-grained flows, dikes or sills, but due to the scale and the scope of the project, not every one of the coarse-grained flows to gabbro dikes/sills are shown individually on the map.
1 Chemical Metasedimentary Rocksc
5a Chert 5b Ferruginous chert 5c Oxide facies ironstone (magnetite bearing) 5d Sulfide facies ironstone (pyrite ± pyrrhotite bearing) 5e Silicate facies ironstone 5f Clastic ironstone
Clastic Metasedimentary Rocks Lithofacies 4a Slate, argillite 4b Mudstone 4c Lithic wacke 4d Lithic arenite 4e Quartz arenite 4f Polymictic conglomerate, matrix supported 4g Polymictic conglomerate, clast supported
Features 4h Graded 4j Laminated 4k Schistose 4m Garnet porphyroblasts 4n Chert
Intermediate and Felsic Metavolcanic Rocksc
Pyroclastic Deposits 3a Tuff 3b Lapilli tuff 3c Lapilli tuff / tuff breccia
Features 3d Quartz-feldspar phyric 3e Feldspar phyric 3f Quartz phyric 3g Schistose
Mafic Metavolcanic Rocks Lithofacies of Flows 2a Massive flows 2b Pillowed flows 2c Autobreccia, flow-top breccia, hyaloclastite breccia 2d Coarse-grained flow to synvolcanic gabbroic dikes and sillsd
Pyroclastic Deposits 2e Tuff 2f Lapilli tuff
Features 2g Dikes 2h Magnetite 2j Plagioclase phyric 2k Variolitic 2m Garnet porphyroblasts 2n Amygdaloidal 2p Schistose 2q Vesicular 2r Amphibolite 2s Hyaloclastite
5
4
3
2
SYMBOLSGeologic boundary
Small bedrockexposure
Fault, interpreted,dextral sense ofhorizontaldisplacement
Fault, interpreted,sinistral sense ofhorizontaldisplacement
Reverse fault,interpreted, firstgeneration, dextralsense of horizontaldisplacement,ball on downthrownside (inclined)
Red Paint Fault Zone
Central Fault Zone
Ductile fault/shear,dextral horizontaldisplacement (inclined)
Ductile fault/shear, sinistral horizontaldisplacement(inclined, trend only)
Ductile fault/shear,unknown horizontaldisplacement(inclined, vertical)
0
2% 0
Igneous contact,dike (inclined)
Igneous contact,unsubdivided(trend only)
Foliation, firstgeneration (trend only,inclined, vertical)
Foliation, secondgeneration (inclined,vertical)
Foliation, unknowngeneration (trend only,inclined)
Cleavage (inclined)
Fracture (inclined)
Mineral lineation(first generation,second generation,unknown generation)
Stretching lineation,with plunge
Intersection lineation,with plunge
Slickenside
Vein, secondgeneration (inclined)
Fold axis(M-asymmetry,Z-asymmetry)
Axial plane of fold,inclined (M-asymmetry,Z-asymmetry)
Pillowed flow,facing known(inclined, vertical)
Pillowed flow,facing known(overturned)
Pillowed flow,facing unknown(trend only, inclined)
Volcanic bedding,facing known (inclined)
Volcanic bedding,facing unknown (inclined)
Graded bedding,facing known(inclined, overturned)
Graded bedding,facing unknown(inclined)
Sedimentary bedding,facing known (inclined)
Bedding, unsubdivided,facing unknown(inclined, vertical)
Vein, unknowngeneration (inclined)
Glacial striae, directionof ice movementunknown
Geochronology samplelocation, with age in Ma(keyed to table 1)
Mineral deposit(keyed to table 2)
Drill hole(keyed to table 4)
Powerline
Road (secondary,tertiary)
10
10
10
10
10
101010
10
10
10
10
Y1: 3001±1
1
Figure 2. Regional maps and associated stereonet diagrams showing the trajectory of the S1 foliation, S2 foliation and L1 lineation across the Lumby Lake greenstone belt.Equal Area
N=578
Equal Area
N=85
Equal Area
N=132
MapNo.3839404142434445464748495051525354555657585960616263646566676869707172
Easting
636506636225635599636338635448635448631021635477644762634486634228631958634634638578630303629663629663630411630411630171629811628651628728629314628667629314633128629076629078633011628991643202643227646487646433
Northing
54357065435706543574054357835435791543579654358545435891543593154360015436005543601854360525436159543617354362295436234543624854362535436289543632954363335436387543644554364485436450543655254365545436556543657654366045437425543748254388425439410
Azimuth
350 360
30 350 170 350
14 360 340
12 343
13 9
315 14
185 185
5 185
0 185
0 0 5 5
185 205 185
5 180
5 220 220 360 360
Dip
-45-40-45-45-45-45-45-40-45-45-45-45-45-45-45-45-55-75-45-90-45-90-90-45-45-45-45-45-45-60-45-45-45-50-44
Length(metres)
76.22163.41
70.432.74
86.3497.56
156.77160.06
36.59181.40
54.94145.18105.64152.74121.65
8.5494.2196.0785.3765.85
127.4435.67
129.27106.71
76.83119.21221.34
79.27106.71459.33112.5046.3445.73
106.4099.36
Company
Candela Dev CoCandela Dev CoCandela Dev CoCandela Dev CoCandela Dev CoCandela Dev CoCandela Dev CoCandela Dev CoT. JohansenCandela Dev CoCandela Dev CoCandela Dev CoCandela Dev CoCandela Dev CoCandela Dev CoPinecone Mines LtdPinecone Mines LtdPinecone Mines LtdPinecone Mines LtdPinecone Mines LtdPinecone Mines LtdPinecone Mines LtdPinecone Mines LtdPinecone Mines LtdPinecone Mines LtdPinecone Mines LtdCandela Dev CoPinecone Mines LtdPinecone Mines LtdCominco LtdPinecone Mines LtdCanadian Nickel Co LtdCanadian Nickel Co LtdCan Nickel Co LtdCan Nickel Co Ltd
Identification
C-33C-9C-4C-11C-10C-384TJ-1C-32C-13C-37C-12C-25C-39P-8AP-8P-3P-1P-5P-7P-2P-6P-12P-4P-10C-33P-13P-11P-83-1P-9319773197557771-057769-0
Commodity
Au
AFRI ID
52G03SE924852G03SE924852G03SE924852G03SE924852G03SE924852G03SE924852G03SE925452G03SE924852G03SE924352G03SE924852G03SE924852G03SE925452G03SE924852G03SE924852G03SE925452G03SE924752G03SE924752G03SE924752G03SE924752G03SE924752G03SE924752G03SE924752G03SE924752G03SE924752G03SE924752G03SE924752G03SE925352G03SE924752G03SE924752G03SE000752G03SE924752G03SE924952G03SE924952G02SW001652G02SW0016
YearDrilled19521952195219521952195219541952198919541952195419521954195419601960196019601960196019601960196019601960195419601960198319601968196819831983
Table 4. Historic diamond drill-hole data for the Lumby Lake greenstone belt. All coordinates are in NAD83, UTM zone 15.
MapNo.12345678910111213141516171819202122232425262728293031323334353637
Easting
621033622363621282621282621410621139622006621160621843622163621548621315622007641451641287641317640040640290637842642323640205637730637786639477637772637777643001637204637625637520635918636039636834636343637471637222644053
Northing
5432448543265654326625432665543269254327065432834543286254328675432890543290254329325432968543313354333505433410543349654335325433539543354554335655433622543368054336945433750543375054337855435565543556654355775435616543562754356605435678543568554356875435701
Azimuth
175 180 340 180 320 180 180 150 180 180 180 180 180 190 360 360 180 180 180 10
180 0 0
180 0 0
190 360 360 360 10
350 18
350 360 360 220
Dip
0-50-45-40-45-4000
-50-45-50-500
-45-45-45-40-40-62-45-40-50-45-45-90-45-45-45-45-45-45-45-45-45-40-40-45
Length(metres)
90.24117.68126.52
63.41105.49
63.4100
184.76169.51178.66212.20109.15121.04
75.9147.8785.98
133.5431.71
218.60111.2830.4931.7166.1631.1031.10
124.0961.2886.8916.7792.07
100.61115.5574.090146.95146.65
50.91
Company
Univex ExplorationPremier Lake Resources LtdUnivex ExplorationKerr Addison Mines LtdUnivex ExplorationKerr Addison Mines LtdUnivex ExplorationUnivex ExplorationPremier Lake Resources LtdPremier Lake Resources LtdPremier Lake Resources LtdPremier Lake Resources LtdUnivex ExplorationFalconbridge Nickel Mines LtdC.L. BolandC.L. BolandJ.D. MacMillan (Canico)J.D. MacMillan (Canico)F. SandersFalconbridge Nickel Mines LtdJ.D. MacMillan (Canico)F. SandersF. SandersJ.D. MacMillan (Canico)F. SandersF. SandersFalconbridge Nickel Mines LtdCandela Dev CoCandela Dev CoCandela Dev CoCandela Dev CoCandela Dev CoCandela Dev CoCandela Dev CoCandela Dev CoCandela Dev CoCanadian Nickel Co Ltd
Identification
L-4PL-88-1L-7LL-76-1L-1LL-76-1L-5L-2PL-88-2PL-88-7PL-88-3PL-88-4L-61T-2-70T-1-7048546-048541-01675N-2-7448540-03448549-065675N-3-74C-1C-2C-2AC-7C-6C-18C-52131979
Commodity
Cu, Zn
Cu, Zn
Ag, Au, Cu, Zn
Ag, Cu, ZnCu, Zn
NiCu, Ni
Cu, Ni
Au
AFRI ID
52G03SW003552G03SW000652G03SW003552G03SW003352G03SW003552G03SW003452G03SW003552G03SW003552G03SW000652G03SW000652G03SW000652G03SW000652G03SW003552G03SE924552G03SE925052G03SE925052G03SE925152G03SE925152G03SE925252G03SE924552G03SE925152G03SE925252G03SE925252G03SE925152G03SE925252G03SE925252G03SE924552G03SE924852G03SE924852G03SE924852G03SE924852G03SE924852G03SE924852G03SE924852G03SE924852G03SE924852G03SE9246
YearDrilled1971198819711976197119761971197119881988198819881971197419701970197119711971197419711971197119711971197119741952195219521952195219531952195219521968
Marginal NotesThe Lumby Lake greenstone belt is composed of two tectonostratigraphicassemblages: the northern assemblage, comprising the Lumby North andPinecone depositional sequences; and the southern assemblage, comprising theLumby South and Bar Lake depositional sequences (Figure 1). The boundariesof these assemblages are based on new geologic mapping as well asgeochemical data (Tomlinson et al. 1999; Hollings and Wyman 1999; Wymanand Hollings 1998) and U-Pb geochronological data (Tomlinson et al. 2003;Davis and Jackson 1988). (See “Sources of Information” for all references.)U-Pb geochronology ages for the greenstone belt are summarized in Table 1and are plotted on the map.
The greenstone belt was first mapped by Woolverton (1960) who interpreted thebelt to be a large syncline with the east-trending axial plane in the centre of thegreenstone belt. The belt was later mapped by Jackson (1985a, 1985b) who alsointerpreted the greenstone belt to be a syncline. New mapping shows thatstratigraphy on the north and south sides of the greenstone belt is different, andinstead of a syncline there is a belt-scale thrust fault at the southern margin of thePinecone sedimentary sequence, with subsequent dextral shearing. For moreinformation on the stratigraphy, intrusive rocks, mineralization and alterationplease see Buse, Lewis and Magnus (2009).
Several new occurrences were identified as a result of the geologic mapping in2009. These are summarized with the Mineral Deposit Inventory (MDI) locationsin Table 2. The majority of the new occurrences are nickel occurrences fromwithin ultramafic intrusive rocks and represent an under-explored commodity inthe Lumby Lake greenstone belt. Another new occurrence is a zinc occurrencethat is consistent with other historic Cu-Zn-Pb-Ag occurrences along the base ofthe greenstone belt. For more information about the mineral potential in thegreenstone belt please see Buse, Lewis and Magnus (2009).
Structural Geology
There are three main deformational events within the Lumby Lake greenstone belt, assummarized in Table 3. The D1 deformational event is represented by an east-trendingpenetrative foliation with an associated northeast-trending stretching lineation (Figure 2).The foliation is commonly defined by chlorite in the mafic metavolcanic rocks and other micasin the felsic metavolcanic rocks. This foliation and its associated lineation are deformed aroundthe plutons that intrude the greenstone belt, due to strain during plutonic emplacement. Theintensity of the S1 foliation ranges from weak to strong and becomes subparallel to D2 shearzone margins. There is weak structural evidence for a D1 north-side-up thrust fault, located atthe southern margin of the Pinecone depositional sequence, that was reactivated during D2faulting. However, stratigraphy to the north and south of this fault is quite different and thereis no evidence for folding in the area, suggesting the synclinal model of Woolverton (1960)and Jackson (1985a, 1985b) is no longer relevant.
The D2 deformational event is related to the northeast-trending Red Paint Fault Zone, locatedon the western margin of the Lumby Lake greenstone belt. D2 faults are sinistral strike-slipfaults that trend northeast. They include the Red Paint Fault Zone and the numerous splaysand corresponding faults that extend from the fault zone. The Red Paint Fault Zone is a 600 mwide zone of intensely foliated mafic metavolcanic rocks, bounded to the west by the relativelyundeformed Dashwa Lake batholith. The smaller D2 splay and corresponding faults are not aswide, but are associated with a similar intensification of the northeast-trending S2 foliation(Figure 2). A northwest-trending, moderately plunging crenulation lineation is also associatedwith this deformational event.
East-trending D2 dextral shear zones are found locally along the base of the greenstone beltas well as in the centre of the greenstone belt at the boundary between the north and southtectonostratigraphic assemblages. This D2 dextral shearing represents the reactivation of theD1 thrust fault at the centre of the greenstone belt. Folding in the Lumby Lake greenstone beltis rare and generally associated with D2 generation faulting. The D3 deformational event isrepresented by a discrete north-trending S3 foliation that may be associated with latemovement in the Red Paint Fault Zone or the emplacement of intrusions following faulting.
Table 2. Mineral occurrences in the Lumby Lake greenstone belt. All coordinates are in NAD83, UTMzone 15; all data for geochemical analyses were provided by the Geoscience Laboratories, OntarioGeological Survey, Sudbury, Ontario.
MapNo.1
23
4
5
6
78910
1112
13141516
17
OccurrenceNameRed PaintLakeBufo Bufo LakeOccurrenceLittle LongLac WestLittle LongLac EastPotras
K14521Wilson-WrenTwo BayLower SerpetLakeSawdoBlowout
Red Paint Alcock, C.A.Cote ZincNicuso
Mathieu, J.A.
Easting
618093
619615619146
625597
626511
617037
617361621273620075612987
619007620035
618064618499620581633148
635590
Northing
5431904
54320695432298
5432325
5432433
5432610
5432649543271554333645433531
54335515433914
5433963543459054353275435694
5435794
Status
Occurrence
OccurrenceOccurrence
Occurrence
Occurrence
DiscretionaryOccurrenceOccurrenceOccurrenceOccurrenceOccurrence
OccurrenceDiscretionaryOccurrenceOccurrenceOccurrenceOccurrenceDiscretionaryOccurrenceOccurrence
MDI Number
MDI52G03SW00035
MDI52G03SW00041MDI52G03SW00052
MDI52G03SW00049
MDI52G03SW00038
MDI52G03SW00013
MDI52G03SW00011MDI52G03SW00037MDI52G03SW00050MDI52G03SW00040
MDI52G03SW00015MDI52G03SW00012
MDI52G03SW00014MDI52G03SW00036MDI52G03SW00042MDI52G03SE00003
MDI52G03SE00008
Commodity
Au
AuAu
Au,Zn,Pb
Zn,Pb,Au
Au
AuCu,ZnCu,AuAu,Cu
AuCu,Au
AuCu,Au
ZnS/py
Fe
Concentration
Table 1. Summary of geochronological data for the Lumby Lake greenstone belt.All coordinates are in NAD83, UTM zone 15; all ages are U-Pb zircon thermal ionizationmass spectrometry (TIMS) ages.
MapNo.12345
Rock Type
Felsic TuffFelsic TuffFelsic TuffFelsic TuffFelsic Tuff
Easting
623942629434645500642623637649
Northing
54325895434606544157354400875437660
Age (Ma)
3001 ± 12897.6 ± 2.13014 ± 12963.3 ± 4.52828 ± 2
Depositional Sequence
Lumby SouthBar Lake
Lumby NorthLumby North
Pinecone
Reference
Tomlinson et al. 2003Tomlinson et al. 2003Tomlinson et al. 2003Tomlinson et al. 2003Tomlinson et al. 2003
Table 3. Summary of deformational events in the Lumby Lake greenstone belt.
Event
D3
D2
D1
Foliation
S3 - N-trending,spaced fracturefoliationS2 - NE-trending,spaced foliation
S1 - E-trending,continuouslydeveloped foliation
Lineation
Not recognized
L2 - NW-trending,moderately plungingelongation lineationL1 - NE-trending,steeply plungingstretching lineation
Faults
Not recognized
D2 - NE-trendingsinistral and E-trendingdextral oblique-slip faultsD1 - E-striking faults
Folds
F3 - Z-shapedasymmetric folds.Axial plane strikes NF2 - Z- and M-shapedfolds. Axial planetrends NENot recognized
Figure 1. Depositional sequences in the Lumby Lake greenstone belt.
1
1 1
1
1
1
1
TwobayLake
MorrisLake
BufoLake
2d
8a
8a
2a
3b
8a3a
2a
8a
2b
8a
2a2a
8a
2b
2a2b 2a
3a
2ab
8ade
2a
2a2a2a
2a
2a
2b
2a
8a 8a
3a
8a
2a
8a
8a
3b
3a,8a
8a,2a
2a
2a
3a
2a3b
2a
3a
2bp
2aj 3af
2a
8a
7abde
3adg
C8aC8a
C8a
C2aC3a
C2b
C3a
C8a
C2a
C8a
C8a
C2b
C8a
C2a
C2bC8a
C8a
C8a
C2a
C3a
C3a
C2bk
8
C2a
C8a
C8a
C8a C8a
C8a
C8aC8a
C8a
C8a
C3aC3a
C2b
C8a C8a
C8a
C2b
C3a
C3adC3a
8 3
3
3
83
76
81
74
65
78
82
83
74
77
74
60
64
67
83
5886
71
73hbl apy,py,ser
ep ank,hblsp,py,ser
Inset, scale 1:10 000
ABBREVIATIONSactAgankapyAubtcalchlcpCuepFegrthblhemkfsmag
.................................actinolite
.......................................silver.................................ankerite...........................arsenopyrite
.........................................gold.......................................biotite.....................................calcite....................................chlorite.............................chalcopyrite....................................copper....................................epidote..........................................iron.....................................garnet.............................hornblende
...............................hematite.................potassium feldspar
.............................magnetite
mbNiorPbplpnpopyqcqtzSserslfspsrptlcZn
....................................marble.......................................nickel
.................................orthoclase.........................................lead
...............................plagioclase...............................pentlandite.................................pyrrhotite........................................pyrite.....................quartz carbonate.....................................quartz
......................................sulphur....................................sericite..............................silicification.................................sphalerite..............................serpentine
...........................................talc.........................................zinc
10
10
10
10
10
10
10
10
10
10
MapNo.18
19
202122232425
OccurrenceNamePineconeLakeSeahorseLakeGarnet BayHanniwellOGS 1OGS 2OGS 3OGS 4
Easting
629942
621402
624278646706620653639831642897623151
Northing
5436495
5436894
543768354399065432775543888054384175438011
Status
Occurrence
Occurrence
OccurrenceOccurrenceOccurrenceOccurrenceOccurrenceOccurrence
MDI Number
MDI52G03SE00010
MDI52G03SW00039
MDI52G03SW00043MDI52G02SW00004
New RecordNew RecordNew RecordNew Record
Commodity
Fe
Fe
Fe,mbAu,Ag
ZnNiNiNi
Concentration
6141 ppm1800 ppm2008 ppm1104 ppm
1
1010
10
10
10
CREDITSGeology by S. Buse, D. Lewis and S. Magnus, with assistance fromC. Purdy, A. Hills, A. Berger and E. Rock.
Digital drafting by J. Webb, S. Buse and D. Lewis.
Cartographic production by A. Evers.
To enable the rapid dissemination of information, this map has notreceived a technical edit. Discrepancies may occur for which the OntarioMinistry of Northern Development, Mines and Forestry does not assumeliability. Users should verify critical information. Sources include both thereferences listed here and information on file at the Resident Geologists’and Mining Recorders’ offices nearest the map area.
The Atikokan Mineral Development Initiative is a Township of Atikokan project managed by the Ontario Prospectors Association. The Initiative is intended to provide a better understanding of the mineral resource potential of targeted areas in the vicinity of the Atikokan community through the collection and analysis of geoscience data and through the marketing of these data to the minerals industry. The geophysical component of the Initiative includes flying new airborne magnetic and electromagnetic surveys in the region and producing the results in digital and hardcopy formats suitable for publication. The Initiative is supported by the Township of Atikokan, Northern Ontario Heritage Fund Corporation, FedNor and the Ontario Geological Survey.
Issued 2010.
Information from this publication may be quoted if credit is given. It isrecommended that reference to this map be made in the following form:
Buse, S., Lewis, D. and Magnus, S. 2010. Precambrian geology of the Lumby Lake greenstone belt; Ontario Geological Survey, Preliminary Map P.3619, scale 1:20 000.
