A proposed domainal reclassification for Saskatchewan’s Hearne and Rae Provinces Colin Card Saskatchewan Geological Survey
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A proposed domainal
reclassification for
Saskatchewan’s Hearne
and Rae Provinces Colin Card
Saskatchewan Geological Survey
Saskatchewan Domains • First Lithostructural
Domains (Lewry and
Sibbald, 1977)
• Domains are the building
blocks of geologic provinces
• a geographic entity, which is
distinguished by a distinct
lithological and/or structural
character
• As we get more data we
have to adapt
• Rocks of like tectonic origin
more likely to have
metallogenic relationships
• The classification is
important for databases like
SMDI
Mudjatik
Mud
jatik
NolanDodge
TantatoBeaverlodge
Lloyd
Zemlak
Virg
in
River
Tal tson
Train
Talts
on
Basem
en
t
Wathaman
La R
onge
Pet
er L
ake
Glennie
Kisse
ynew
Flin Flon
Kisse
ynew
Wol
last
on
Rot
tens
tone
NW
HWPW
IW
Cle
arw
ate
r
Carswell
Lloyd
Athabasca Basin
HEARNE
RAE
SASK
REINDEER ZONE
BBIW
PHANEROZOICS
now
bird
tect
onic
zo
ne
Lake
Pasfield Lake
Cree Lake
Wolla
ston
Lake
Reindee
r
Lake
Lac
Ronge
DeschambaultLake
Black Lake
AmiskLake
Athabasca
La
60 No
10
2W o
11
0W
o
54 No
0 10 30 50
km
Al b
er t
aS
askatc
hew
an
NW = Nistowiak Window
HW = Hunter Bay WindowPW = Pelican Window
Archean Windows
IW = Iskwatikan WindowSask craton
BBIW = Black Bear Island Window Hearne
Saskatchewan Domains • First Lithostructural
Domains (Lewry and
Sibbald, 1977)
• Domains are the building
blocks of geologic provinces
• a geographic entity, which is
distinguished by a distinct
lithological and/or structural
character
• As we get more data we
have to adapt
• Rocks of like tectonic origin
more likely to have
metallogenic relationships
• The classification is
important for databases like
SMDI
Mudjatik
Mud
jatik
NolanDodge
TantatoBeaverlodge
Lloyd
Zemlak
Virg
in
River
Tal tson
Train
Talts
on
Basem
en
t
Wathaman
La R
onge
Pet
er L
ake
Glennie
Kisse
ynew
Flin Flon
Kisse
ynew
Wol
last
on
Rot
tens
tone
NW
HWPW
IW
Cle
arw
ate
r
Carswell
Lloyd
Athabasca Basin
HEARNE
RAE
SASK
REINDEER ZONE
BBIW
PHANEROZOICS
now
bird
tect
onic
zo
ne
Lake
Pasfield Lake
Cree Lake
Wolla
ston
Lake
Reindee
r
Lake
Lac
Ronge
DeschambaultLake
Black Lake
AmiskLake
Athabasca
La
60 No
10
2W o
11
0W
o
54 No
0 10 30 50
km
Al b
er t
aS
askatc
hew
an
NW = Nistowiak Window
HW = Hunter Bay WindowPW = Pelican Window
Archean Windows
IW = Iskwatikan WindowSask craton
BBIW = Black Bear Island Window Hearne
Proposed Reclassifications
• Four changes proposed
1. Taltson Domain and Lloyd Domains are
combined; Taltson is the retained name
2. Virgin River and Mudjatik Domains are
combined; Mudjatik is the retained name
3. The Virgin schist group is added to the
Taltson Domain
4. The Ennadai Domain is created in the NE
corner of the province
1. Lloyd/Taltson Domain
• Small domain in NW
Saskatchewan
• 2003 replacement of
the Western Granulite
Domain
• Lloyd Lake is a
geographic feature in
the domain’s centre
• Cree South project:
2007-2009
Mudjatik
Mud
jatik
NolanDodge
TantatoBeaverlodge
Lloyd
Zemlak
Virg
in
River
Tal tson
Train
Talts
on
Basem
en
t
Wathaman
La R
onge
Pet
er L
ake
Glennie
Kisse
ynew
Flin Flon
Kisse
ynew
Wol
last
on
Rot
tens
tone
NW
HWPW
IW
Cle
arw
ate
r
Carswell
Lloyd
Athabasca Basin
HEARNE
RAE
SASK
REINDEER ZONE
BBIW
PHANEROZOICS
now
bird
tect
onic
zo
ne
Lake
Pasfield Lake
Cree Lake
Wolla
ston
Lake
Reindee
r
Lake
Lac
Ronge
DeschambaultLake
Black Lake
AmiskLake
Athabasca
La
60 No
10
2W o
11
0W
o
54 No
0 10 30 50
km
Al b
er t
aS
askatc
hew
an
NW = Nistowiak Window
HW = Hunter Bay WindowPW = Pelican Window
Archean Windows
IW = Iskwatikan WindowSask craton
BBIW = Black Bear Island Window Hearne
Age determinations
• Purple dots =
older, arc
plutons
• Orange dots =
metamorphic
age or pluton
1974 Ma
1968 Ma
1937-1911
Ma
1985, 1975 and
1941, 1927 Ma
1932 Ma
New Domain: Taltson
• Lloyd is combined with Taltson
• Taltson extends under the Athabasca
Basin and continues to the GSLsz
• Naming is based on geologic relationships
rather than a geographic feature
Mudjatik
Mud
jatik
NolanDodge
TantatoBeaverlodge
Lloyd
Zemlak
Virg
in
River
Tal tson
Train
Talts
on
Basem
en
t
Wathaman
La R
onge
Pet
er L
ake
Glennie
Kisse
ynew
Flin Flon
Kisse
ynew
Wol
last
on
Rot
tens
tone
NW
HWPW
IW
Cle
arw
ate
r
Carswell
Lloyd
Athabasca Basin
HEARNE
RAE
SASK
REINDEER ZONE
BBIW
PHANEROZOICS
now
bird
tect
onic
zo
ne
Lake
Pasfield Lake
Cree Lake
Wolla
ston
Lake
Reindee
r
Lake
Lac
Ronge
DeschambaultLake
Black Lake
AmiskLake
Athabasca
La
60 No
10
2W o
11
0W
o
54 No
0 10 30 50
km
Al b
er t
aS
askatc
hew
an
NW = Nistowiak Window
HW = Hunter Bay WindowPW = Pelican Window
Archean Windows
IW = Iskwatikan WindowSask craton
BBIW = Black Bear Island Window Hearne
2. Virgin River/Mudjatik Domain
• Virgin River Domain (Lewry and Sibbald, 1977)
1.Virgin River: “belt of overall structural linearity”
2.No difference was cited between rock types
3.A variation in metamorphic conditions was noted
4.Virgin schist group in the VRD
5.Cree South project: 2007-2009
2. Virgin River/Mudjatik Domain
• Virgin River Domain (Lewry and Sibbald, 1977)
1.Virgin River: “belt of overall structural linearity”
2.No difference was cited between rock types
3.A variation in metamorphic conditions was noted
4.Virgin schist group in the VRD
5.Cree South project: 2007-2009
Mudjatik
Mud
jatik
NolanDodge
TantatoBeaverlodge
Lloyd
Zemlak
Ena
Virg
in
River
Tal tson
Train
Talts
on
Basem
en
t Wathaman
La R
onge
Pet
er L
ake
Glennie
Kisse
ynew
Flin Flon
Kisse
ynew
Wol
last
on
Rot
tens
tone
NW
HWPW
IW
Cle
arw
ate
r
Carswell
Lloyd
Athabasca Basin
HEARNE
RAE
SASK
REINDEER ZONE
BBIW
PHANEROZOIC
Sno
wbi
rd
tect
onic
zo
ne
Lake
Pasfield Lake
Cree Lake
Wolla
ston
Lake
Reindee
r
Lake
Lac
Ronge
DeschambaultLake
Black Lake
AmiskLake
Athabasca
La
60 No
10
2W o
11
0W
o
54 No
0 10 30 50
km
Al b
er t
aS
askatc
hew
an
NW = Nistowiak Window
HW = Hunter Bay WindowPW = Pelican Window
Archean Windows
IW = Iskwatikan WindowSask craton
BBIW = Black Bear Island Window Hearne
East Lloyd FoldVirgin River
Virgin Cable Bay
Mudjatik Dom
e and Basin
Lloyd Domain
Virgin Schist Group
Quaternary drift and outwash
Hearne Province
Leucogranite
Granodiorite
Leucotonalite
Dolomitic Marble
Quartzite or chert
Banded iron formation
Psammopelite to pelite
Ultramafic rocks
Banded quartzofeldspathic rocks
Amphibolite
K-metasomatised amphibolite
Mg-metasomatised amphibolite
Psammite, quartzite
Saprolitic rocks
Porphyritic monzogranite
Monzogranite gneiss
Leucogranodiorite to leucotonalite
Tonalite to granodiorite
Tonalite gneiss
Heterogeneous intermediate gneiss
Ultrabasic rocks
Diorite to gabbro or meladiorite
Quartz monzodiorite, granodiorite andleucogranodiorite
Quartz diorite to tonaliteDiatextic psammopelite to pelite
Quartzite
Garnet-andalusite psammopelite to pelite
Mafic volcanic rock
0 1 42km
57 No
57o
N
108oW
108 Wo
Granulite-facies boundary – North of boundary: Granulite-facies assemblages (M ); South of boundary: amphibolite-facies overprint (M ) on M
1
2 1
Virgin River high-strain transition (teeth indicate the dip of the high-strain zone)
Diabase: area in which diabase dykes were documented
Cable Bay straight belt – between boundary lines
F fold axial trace3
F fold axial trace4
Shear ZoneRiver Fold
Straight Belt
Virgin River/Mudjatik domains
Virgin River/Mudjatik domains
• New geophysics are key to this interpretation
• Virgin River is a prominent positive magnetic anomaly on the shield
• Internal character is masked by NW trending lineaments
Virgin River/Mudjatik domains
Virgin River/Mudjatik domains
New Domain: Mudjatik
• The Virgin River
Domain is combined
with Mudjatik Domain
• New Domain extends
NE of the Athabasca
Basin
3. Except the Virgin
schist
groupTaltson
– Looks like a
Rae/Taltson magmatic
zone succession
(detrital zircon
fingerprint)
Mudjatik
Mudjatik
NolanTrain Dodge
Tantato
Beaverlodge
Taltson
Zemlak
Taltson
Talts
on
Basem
ent
Wat
ham
an
La R
onge
Pet
er L
ake
Glenn
ie
Kisse
ynew
Flin Flon
Kisse
ynew
Wol
last
on
Rot
tens
tone
NW
HWPW
IW
Cle
arw
ate
r
Carswell
Ennadai
HEARNE
RAE
SASK
ATHABASCA BASIN
PHANEROZOIC
REINDEER ZONE
BBIW
Lake
Pasfield Lake
Cree Lake
Wolla
ston
Lake
Rei
ndee
r
Lake
Lac La
Ronge
DeschambaultLake
Black Lake
AmiskLake
Athabasca
Sno
wbi
rd
tect
onic
zone
Cab
leBay
shea
rzo
ne
60
010 30 50
km
102
11
0
54
Northwest Territories
Stony Rapids
NW = Nistowiak Window
HW = Hunter Bay WindowPW = Pelican Window
Archean Windows
IW = Iskwatikan WindowSask craton
BBIW = Black Bear Island Window Hearne
Mudjatik
Mud
jatik
NolanDodge
TantatoBeaverlodge
Lloyd
Zemlak
Ena
Virg
in
River
Tal tson
Train
Talts
on
Basem
en
t
Wathaman
La R
onge
Pet
er L
ake
Glennie
Kisse
ynew
Flin Flon
Kisse
ynew
Wol
last
on
Rot
tens
tone
NW
HWPW
IWC
learw
ate
r
Carswell
Lloyd
Athabasca Basin
HEARNE
RAE
SASK
REINDEER ZONE
BBIW
PHANEROZOIC
Sno
wbi
rd
tect
onic
zo
ne
Lake
Pasfield Lake
Cree Lake
Wolla
ston
Lake
Reindee
r
Lake
Lac
Ronge
DeschambaultLake
Black Lake
AmiskLake
Athabasca
La
60 No
10
2W o
11
0W
o
54 No
0 10 30 50
km
Al b
er t
aS
askatc
hew
an
NW = Nistowiak Window
HW = Hunter Bay WindowPW = Pelican Window
Archean Windows
IW = Iskwatikan WindowSask craton
BBIW = Black Bear Island Window Hearne
4. Ennadai Domain • Ennadai-Kaminak
appears in the 1987
SOI
• Energy and Mines
maps the area and the
Ennadai shrinks in 1991
• Ennadai disappears in
1994
• Phelps Lake Project:
2001-2003 (Harper)
•Analytical support (GSC
collaboration) advances
understanding
4. Ennadai Domain • Ennadai-Kaminak
appears in the 1987
SOI
• Energy and Mines
maps the area and the
Ennadai shrinks in 1991
• Ennadai disappears in
1994
• Phelps Lake Project:
2001-2003 (Harper)
•Analytical support (GSC
collaboration) advances
understanding
Ennadai vs Mudjatik
• Extension of the CHsb
– Oceanic tectonic
environment
• 2.71-2.70 Ga intrusions
(minimum age of mafic
volcanic rocks)
• 2.68 rhyolite and granite
• Geochemical studies
identify low and high-
grade Ennadai
Low grade
Ennadai vs Mudjatik
• Both contain >2.7 Ga
orthogneiss.
• Ennadai: contains
~2680 Ga plutons
• Southern Hearne:
<2600 Ga
• Differences in the
provenance of the
volcanic rocks:
Oceanic vs Continental
• Where is the
transition?
Ennadai vs Mudjatik:
Where’s the boundary • The southern Hearne
extends beneath
almost the entire
Athabasca Basin
• There is a change
near the NE basin
boundary.
• Major change in the
northeast
Southern Ennadai boundary
Southern Ennadai boundary?
Ennadai southern Hearne
boundary? • Is there a geological
change?
• Unit marked granitic
migmatite complex
Ennadai southern Hearne
boundary? • Is there a geological
change?
• Unit marked granitic
migmatite complex
New Domain: Ennadai
• Contains both low- and high-grade rocks
of the Central Hearne supracrustal belt
• Differences in the provenance of the
volcanic rocks in Ennadai and Mudjatik:
• Oceanic vs Continental
• Boundary chosen using bedrock mapping,
analytical data and geophysics
Metallogeny: Mudjatik vs Ennadai
• Ennadai: Au and
VMS
• Mudjatik: U,
Sediment-hosted
base metals; Au
associated with
BIF
Summary • Taltson Domain is be
extended south of the Athabasca Basin
• Major changes proposed for the Mudjatik 1. Virgin River is removed
2. Virgin schist group moves from the former Virgin River Domain to the Taltson Domain
3. Ennadai Domain is separated from the Mudjatik Domain to the southwest
Mudjatik
Mudjatik
NolanTrain Dodge
Tantato
Beaverlodge
Taltson
Zemlak
Taltson
Talts
on
Basem
ent
Wat
ham
an
La R
onge
Pet
er L
ake
Glenn
ie
Kisse
ynew
Flin Flon
Kisse
ynew
Wol
last
on
Rot
tens
tone
NW
HWPW
IW
Cle
arw
ate
r
Carswell
Ennadai
HEARNE
RAE
SASK
ATHABASCA BASIN
PHANEROZOIC
REINDEER ZONE
BBIW
Lake
Pasfield Lake
Cree Lake
Wolla
ston
Lake
Rei
ndee
r
Lake
Lac La
Ronge
DeschambaultLake
Black Lake
AmiskLake
Athabasca
Sno
wbi
rd
tect
onic
zone
Cab
leBay
shea
rzo
ne
12
3
60
010 30 50
km
102
11
0
54
Northwest Territories
Stony Rapids
NW = Nistowiak Window
HW = Hunter Bay WindowPW = Pelican Window
Archean Windows
IW = Iskwatikan WindowSask craton
BBIW = Black Bear Island Window Hearne
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