Geochemistry and economic potential of tectonically distinct volcanic

Geochemistry and economic potential of tectonically distinct volcanic

Geochemistry and economic potential
of tectonic terranes at the north flank
of the Flin Flon Belt.
by
Paul Gilbert
SL
AV
E
NA IN
RAE
NE
AR H udson
E
H
Bay
O
TH
50 N
50N
SUPERIOR
W YOM
ING
13 0 W
60 W
Kississing
Lake
Atlantic
Ocean
KISSEYNE W DOMAIN
'south flank'
Wildn est
Lake
Kisseynew Lake
File
La ke
FLIN FLON BELT
Elbow
Lake
F
STUDY AREA
Wekusko
Amisk collage
La ke
Reed
Lak e
PHANEROZO IC
COVER
2 0 km
Northern FF Belt: Geochemical Assemblages
Simplified tectonic history of the Flin Flon Belt
Pre-accretion period (1.906 – 1.881 Ga) ‘Juvenile arc’
1.9 – 1.88
Juvenile arc and BABB volcanism, and turbidite
sedimentation Flin Flon arc assemblage
Elbow-Athapapuskow ocean-floor assemblage
Tectonic accretion - 1.88 to 1.87
Amisk collage
Post-accretion period (1.876 – 1.838 Ga) -
Juvenile calk-alkaline plutons
‘Successor arc’
1.87 – 1.847
Marine to subaerial sedimentation
1.84 – 1.81
Peak orogeny, continental collision
Northern FF Belt: Geochemical Assemblages
Northern FF Belt: Fault Blocks
Gabbro (Juvenile Arc)
Tartan
Granitoid rocks
Missi Group
(Successor Arc)
Dismal
Wabishkok
0
5
Wabishkok Lake
10 km
Animus
cA
La
e
ime
Lac Aimee
Na osap Lake
Sourdough Bay
Embury
Lake
Mikanagan
Alberts
Lake
road
Northern FF Belt: Geochemical Assemblages
Northern FF Belt: Fault Blocks
Gabbro (Juvenile Arc)
Tartan
Granitoid rocks
Missi Group
(Successor Arc)
Dismal
Wabishkok
0
5
Wabishkok Lake
10 km
Animus
c
La
ee
A im
Lac Aimee
Na osap Lake
Sourdough Bay
Embury
Lake
Mikanagan
Alberts
Lake
road
Selected Element Averages
Tectonic
type
SiO2%
TiO2 %
FeO total
%
Wabishkok Lake,
Lac Aim ée,
Sourdough Bay
ARC
56
0.5
10.6
0.7
Animus L ake
E-MORB
50
1.6
12.6
0.5
Mikan agan Lake
E-MORB
51
1.9
13.4
0.9
Animus L ake
N-MORB
49
0.6
11.4
0.1
Lac Aim ée
TRANS
Arc/E -MORB
55
1.1
13.6
0.8
Dismal Lake
TRANS
N-MORB/A rc
50
0.9
11.2
0.1
Fault Block
Th ppm
2.5
ARC
OCEANFLOOR
2.0
Wabishkok
Lac Aimee
Sourdough Bay
MORB-LIKE
Animus
Mikanagan
1.5
TiO2
JUVENILE
ARC
1.0
0.5
0.0
0
1
2
3
4
5
MgO
6
7
8
9
10
Lac Aimee
100
Animus Lake
100
Rock / N-MORB
10
1
.1
R oc k / N-MOR B
10
1
1
Th NbLa CeNdSm Zr Hf Eu T i Dy Y YbLu
Animus Lake N-MORB
10
1
.1
Th NbL a Ce NdSm Zr Hf Eu Ti Dy Y Yb Lu
Wabishkok Lake
Th NbLa CeNdSm Zr Hf Eu T i Dy Y Yb Lu
100
R ock / N-MOR B
Rock / N-MORB
10
1
Th NbL aCeNdSmZr Hf Eu Ti GdDy Y Er YbLu
Dismal Lake
Dismal Lake Tran sitio nal
(MORB/arc- like)
Wabish kok Lake Arc
.1
Flow
Gabbro
10 0
Lac Aimee Transitional
( Arc/MORB-like)
100
10
.1
ThNbLa CeNdSmZr Hf Eu Ti G dDy Y Er YbLu
100
.1
Ani mus Lake E-typ e MORB
Roc k / N-MORB
Rock / N-MORB
Lac Aimee su ite
10
1
.1
ThNbLaCeNdSm Zr HfEu TiGdDy Y Er Yb L u
1 ARC BASALTS
· enrichment of LREE + Th
· Nb negative anomaly
· negative profile due to HFSE (Ti, Zr and Hf)
2 E-MORB BASALTS - e.g. ANIMUS LAKE
BASALT
· REE contents similar to MORB, but
moderately higher LREE
· No REE depletion
· No Nb spike
101°37'30"
54° 53'00"
101°25'00"
54°53'00"
Wabishkok
Lak e
ANIMUS LAKE
BLOCK
NO RTH AIMEE
GABBRO
WABIS HKOK LAKE BLOCK
E
ZO N
LAK E
Mills
Aim
L ac
An im us
Lake
ee
AI M
Is.
T
UL
FA
EE
ANIMU
S
L AC
Naosap Lake
SOURDO UGH BAY BLOCK
Volcanic Rocks
FAU
LT
LAC AIMEE
BLOCK
AN
IM US
LA KE
Alberts
54°48'40"
101 °37'30"
N-typ e MORB
Granitoid
E-type MORB (flow/
intrusive)
Gabbroic
Arc
Lake
0
2
kil ometres
Intrusive Rocks
Transitional (Arc/
MORB-like basalt)
Turbidite Sediment
Fault
Anticline
(F1,F2)
Syncline
(F1,F2)
Mineralization
(b ase metal)
54°48'40"
101°25'00"
Lac Aimee
100
Animus Lake
100
Rock / N-MORB
10
1
.1
R oc k / N-MOR B
10
1
1
Th NbLa CeNdSm Zr Hf Eu T i Dy Y YbLu
Animus Lake N-MORB
10
1
.1
Th NbL a Ce NdSm Zr Hf Eu Ti Dy Y Yb Lu
Wabishkok Lake
Th NbLa CeNdSm Zr Hf Eu T i Dy Y Yb Lu
100
R ock / N-MOR B
Rock / N-MORB
10
1
Th NbL aCeNdSmZr Hf Eu Ti GdDy Y Er YbLu
Dismal Lake
Dismal Lake Tran sitio nal
(MORB/arc- like)
Wabish kok Lake Arc
.1
Flow
Gabbro
10 0
Lac Aimee Transitional
( Arc/MORB-like)
100
10
.1
ThNbLa CeNdSmZr Hf Eu Ti G dDy Y Er YbLu
100
.1
Ani mus Lake E-typ e MORB
Roc k / N-MORB
Rock / N-MORB
Lac Aimee su ite
10
1
.1
ThNbLaCeNdSm Zr HfEu TiGdDy Y Er Yb L u
Selected Element Averages
Tectonic
type
SiO2%
TiO2 %
FeO total
%
Wabishkok Lake,
Lac Aim ée,
Sourdough Bay
ARC
56
0.5
10.6
0.7
Animus L ake
E-MORB
50
1.6
12.6
0.5
Mikan agan Lake
E-MORB
51
1.9
13.4
0.9
Animus L ake
N-MORB
49
0.6
11.4
0.1
Lac Aim ée
TRANS
Arc/E -MORB
55
1.1
13.6
0.8
Dismal Lake
TRANS
N-MORB/A rc
50
0.9
11.2
0.1
Fault Block
Th ppm
2.5
2.0
OCEAN-FLOOR
1.5
TiO2
1.0
JUVENILE
ARC
0.5
0.0
0
1
2
3
4
5
6
MgO
Lac Aimee Transitional
(arc / MORB-like)
Animus Lake N-MORB
7
8
9
10
Hf/ 3
N-MORB
Thol
Arc
E-MORB
CA
Th
Nb/ 16
Wabishkok
Lac Aimee
Sourdough Bay
ARC
Lac Aimee
TRANSITIONAL
ARC/MORB-like
Animus
E-MORB
Animus
N-MORB
Dismal
TRANSITIONAL
MORB/ARC-like
Arc-rift terranes
· MORB-like basalts + ferrobasalts
· Intra-arc extension-related turbidite basins
101°37'30"
54° 53'00"
101°25'00"
54°53'00"
Wabishkok
Lak e
ANIMUS LAKE
BLOCK
NO RTH AIMEE
GABBRO
WABIS HKOK LAKE BLOCK
E
ZO N
LAK E
Mills
Aim
L ac
An im us
Lake
ee
AI M
Is.
T
UL
FA
EE
ANIMU
S
L AC
Naosap Lake
SOURDO UGH BAY BLOCK
Volcanic Rocks
FAU
LT
LAC AIMEE
BLOCK
AN
IM US
LA KE
Alberts
54°48'40"
101 °37'30"
N-typ e MORB
Granitoid
E-type MORB (flow/
intrusive)
Gabbroic
Arc
Lake
0
2
kil ometres
Intrusive Rocks
Transitional (Arc/
MORB-like basalt)
Turbidite Sediment
Fault
Anticline
(F1,F2)
Syncline
(F1,F2)
Mineralization
(b ase metal)
54°48'40"
101°25'00"
• Turbidite in Lac Aimée Block
with scour structure and graded bedding
• Rhyolite flow in Lac Aimée Block
with flow banding
• Fragmental rhyolite
flow east of
Wabishkok Lake
0
101 40’00”
54 056’00”
0
101 25’ 00”
54 056’00”
Dis mal
La ke
KO TYK LAKE
INTRUSION
P ISTO L
LAKE
G RANODIO RITE
Pis tol
La ke
Kotyk
La ke
Wab ishk ok
54 053’00”
1010 40’00”
La ke
0
1
2
k ilometres
LEGEND
Blue berry
Lake
54 053’00”
1010 25’ 00”
3
SYMBOLS
(4a)
Granodiorite, granite
Geologi cal contact (approxima te)
(4b)
Quartz diorite, tonalite, diorite,
granodiorite ( / / / with enclaves of unit 1)
Wabishk ok Lake antiform
(3a)
Gabbro, hornblendite
(3b)
Pyroxenite
(2a)
Rhyolite, massive to fragmental
(2b)
Feldspar-quartz porphyry
(1a-h) Basalt, gabbro, amphibolite, mafic gneiss;
minor volcanic breccia
Minerali zation (pyrite+pyrrhotite)
Diamond-dri ll hole
Electrom agnetic conducto r
Gravel r oad, track
Not e: Unit numbers correspond to
those on Preliminary Map 2001F-3
Rock/Chondrite
Rhyolite enclave
within Kotyk gabbro
100
Rhyolite unit in
southwest part of
Wabishkok Lake
10
La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu
Wabishkok rhyolite
Flin Flon Mine rhyolite
Rock/Chondrite
100
10
La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu
Wabishkok rhyolite
1
Th/Nb
Flin Flon
arc assemblage
rhyolites Flin Flon extensionrelated rhyolites
Flin Flon
Mine rhyolite
.1
0
10
20
30
Yb/ .22
40
50
400
Wabishkok rhyolite
Flin Flon exten sionrelated rhyolites
2
/Ti
O
Zr
Zr 200
=0
. 13
Zr/Ti
O =
2
0.28
300
iO
/T
r
Z
2
=
5
6
0
0.
TiO
/
r
Z
100
=
Zr/ TiO2
Flin Flon
Mine rhyolite
(main phase)
0
0.0
0.1
2
.0
=0
0.2
Flin Flon ar c
assem blage
rhyolites
4
0.01 6
0.3
0.4
TiO 2
0.5
0.6
0.7
Rock/Chondrite
Wabishkok rhyolite
100
Type F111a Archean
rhyolite
(Lesher et al.,1986)
10
La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu
Ti/ 100
Wabishkok rhyolite
F1
F11
F111a
F111b
Zr/ 10
Y
Fault Blocks Tectonic Affinity
Block
Arc
Wabishko k
+
L ac A imée
+
Sourdough
+
E-MORB
Rifting
+
+
Animus
+
Mikan agan
+
Dismal
N-MORB Transitional Felsic volc Turbidites
+
+
+
+
+
+
+
+
?
?
+
+