Northern Flin Flon Belt application of geochemistry, GAC 2003 · Note: Unit numbers correspond to...
Transcript of Northern Flin Flon Belt application of geochemistry, GAC 2003 · Note: Unit numbers correspond to...
Application of geochemistry for the assessment of economic potential of
tectonically distinct volcanic terranesin the northern Flin Flon Belt,
Manitoba, Canada
by Paul Gilbert
Kisseynew Lake
KississingLake
Wekusko
La ke
FileLa ke
Wildn estLake
ElbowLake
Reed Reed Lake
T HO
AtlanticOcean
H udsonBay
NA IN
SUPERIOR
RAE
SLAV
E
HE ARNE
WYO
MIN
G
130 W50 N
50 N
60 W
KISSEYNEW DOMAIN'south flank'
F
20 km
PHANEROZOICCOVER
Amisk collage
FLIN FLON BELT
STUDY AREA
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 assemblageElbow-Athapapuskow ocean-floor assemblage
Tectonic accretion - 1.88 to 1.87 Amisk collage
Post-accretion period (1.876 – 1.838 Ga) -‘Successor arc’
Juvenile calk-alkaline plutons
1.87 – 1.847 Marine to subaerial sedimentation1.84 – 1.81 Peak orogeny, continental collision
Northern FF Belt: Geochemical Assemblages
Wabishkok Lake
Lac Aimee
Naosap Lake
Alberts Lake
Embury Lake
road
Gabbro (Juvenile Arc)Granitoid rocks Missi Group(Successor Arc)
0 5 10 km
TartanDismalWabishkokAnimusLac Aimee
Sourdough BayMikanagan
Northern FF Belt: Fault Blocks
Wabishkok Lake
Lac Aimee
Naosap Lake
Alberts Lake
Embury Lake
road
Gabbro (Juvenile Arc)Granitoid rocks Missi Group(Successor Arc)
0 5 10 km
TartanDismalWabishkokAnimusLac Aimee
Sourdough BayMikanagan
Northern FF Belt: Geochemical Assemblages
Northern FF Belt: Fault Blocks
Selected Element Averages
2 %Fault Block Tectonic type SiO2 TiO % FeO total
% Th ppm
Wabishkok Lake,Lac Aimée,
Sourdough BayARC 56 0.5 10.6 0.7
Animus Lake E-MORB 50 1.6 12.6 0.5
Mikanagan Lake E-MORB 51 1.9 13.4 0.9
Animus Lake N-MORB 49 0.6 11.4 0.1
Lac Aimée TRANSArc/E-MORB
55 1.1 13.6 0.8
Dismal Lake TRANSN-MORB/Arc
50 0.9 11.2 0.1
ARC Wabishkok Lac Aimee Sourdough Bay
MORB-LIKE Animus Mikanagan
JUVENILE ARC
OCEAN-FLOOR
0 1 2 3 4 5 6 7 8 9 100.0
0.5
1.0
1.5
2.0
2.5
TiO2
MgO
Th NbLa CeNdSm ZrHf Eu Ti Dy Y YbLu .1
1
10
100
Roc
k / N
-MO
RB Flow Gabbro
Th NbLa CeNdSm Zr Hf Eu Ti Dy Y YbLu .1
1
10
100
Rock
/ N
-MO
RB
Animus Lake N-MORB
Th NbLa Ce NdSmZr Hf Eu Ti Dy Y Yb Lu .1
1
10
Roc
k / N
-MO
RB
100
Lac Aimee Transitional (Arc/MORB-like)
.1
1
10
100
ThNbLaCeNdSmZr Hf Eu Ti GdDy Y Er YbLu
Lac Aimee suite
Roc
k / N
-MO
RB
.1
1
10
100
Th NbLaCeNdSmZr HfEu TiGdDyY Er YbLu
Wabishkok Lake Arc
Rock
/ N
-MO
RB
.1
1
10
100
ThNbLaCeNdSmZrHfEu TiGdDy Y ErYbLu
Dismal Lake Transitional (MORB/arc- like)
Roc
k / N
-MO
RB
Lac Aimee Animus Lake
Wabishkok Lake Dismal Lake
Ani mus Lake E-type MORB
1 ARC BASALTS
·
·
·
enrichment of LREE + Th
Nb negative anomaly
negative profile due to HFSE depletion (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
GEOCHEMICAL TYPES
1. Arc
2. E-MORB
3. Dismal Lake Transitional
4. Lac Aimee Transitional
5. Animus Lake N-MORB
ZONE
LAKE
FAU
LTA
NIM
USAN
IMU
S
Mil ls Is.
NORTH AIMEE GABBRO
LAC AIMEE BLOCK
WABISHKOK LAKE BLOCK
54°48'40"101°25'00"
0
kil ometres
2
Naosap Lake
FAULT
101°25'00"54°53'00"54°53'00"
101°37'30"
101°37'30"54°48'40"
Lac Aimee
LAC
AIMEE
Lake
LAK
E
Animus
Alberts
Lake
SOURDOUGH BAY BLOCK
FaultAnticline(F ,F )1 2
Syncline(F ,F )1 2
N-type MORB
Mineralization (b ase metal)
Volcanic Rocks
E-type MORB (flow/intrusive)Arc
Transitional (Arc/MORB-like basalt)
Turbidite Sediment
Gabbroic
Granitoid
Intrusive Rocks
ANIMUS LAKE BLOCK
Wabishkok Lake
Th NbLa CeNdSm ZrHf Eu Ti Dy Y YbLu .1
1
10
100
Roc
k / N
-MO
RB Flow Gabbro
Th NbLa CeNdSm Zr Hf Eu Ti Dy Y YbLu .1
1
10
100
Rock
/ N
-MO
RB
Animus Lake N-MORB
Th NbLa Ce NdSmZr Hf Eu Ti Dy Y Yb Lu .1
1
10
Roc
k / N
-MO
RB
100
Lac Aimee Transitional (Arc/MORB-like)
.1
1
10
100
ThNbLaCeNdSmZr Hf Eu Ti GdDy Y Er YbLu
Lac Aimee suite
Roc
k / N
-MO
RB
.1
1
10
100
Th NbLaCeNdSmZr HfEu TiGdDyY Er YbLu
Wabishkok Lake Arc
Rock
/ N
-MO
RB
.1
1
10
100
ThNbLaCeNdSmZrHfEu TiGdDy Y ErYbLu
Dismal Lake Transitional (MORB/arc- like)
Roc
k / N
-MO
RB
Lac Aimee Animus Lake
Wabishkok Lake Dismal Lake
Ani mus Lake E-type MORB
Selected Element Averages
2 %Fault Block Tectonic type SiO2 TiO % FeO total
% Th ppm
Wabishkok Lake,Lac Aimée,
Sourdough BayARC 56 0.5 10.6 0.7
Animus Lake E-MORB 50 1.6 12.6 0.5
Mikanagan Lake E-MORB 51 1.9 13.4 0.9
Animus Lake N-MORB 49 0.6 11.4 0.1
Lac Aimée TRANSArc/E-MORB
55 1.1 13.6 0.8
Dismal Lake TRANSN-MORB/Arc
50 0.9 11.2 0.1
N-MORB
E-MORB
Thol
CA
Arc
TRANSITIONALMORB/ARC-like
Th Nb/ 16
Hf/ 3
WabishkokLac AimeeSourdough Bay
Lac Aimee TRANSITIONALARC/MORB-like
E-MORB
N-MORB
Animus
Animus
Dismal
ARC
Arc-rift terranes
·
·
MORB-like basalts + ferrobasalts
Intra-arc extension-related turbidite basins
ZONE
LAKE
FAU
LTA
NIM
USAN
IMU
S
Mil ls Is.
NORTH AIMEE GABBRO
LAC AIMEE BLOCK
WABISHKOK LAKE BLOCK
54°48'40"101°25'00"
0
kil ometres
2
Naosap Lake
FAULT
101°25'00"54°53'00"54°53'00"
101°37'30"
101°37'30"54°48'40"
Lac Aimee
LAC
AIMEE
Lake
LAK
E
Animus
Alberts
Lake
SOURDOUGH BAY BLOCK
FaultAnticline(F ,F )1 2
Syncline(F ,F )1 2
N-type MORB
Mineralization (b ase metal)
Volcanic Rocks
E-type MORB (flow/intrusive)Arc
Transitional (Arc/MORB-like basalt)
Turbidite Sediment
Gabbroic
Granitoid
Intrusive Rocks
ANIMUS LAKE BLOCK
Wabishkok Lake
• Turbidite in Lac Aimée Block with scour structure and graded bedding
• Rhyolite flow in Lac Aimée Blockwith flow banding
Pistol
Dismal
Lake
La ke
KotykLa ke
Wab ishkok LakeBlueberry
Lake
KOTYK LAKEINTRUSIONPISTOL
LAKEGRANODIO RITE
0 1 2 3kilometres
Geological contact (approxima te)
Wabishk ok Lake antiform Minerali zation (pyrite+pyrrhotite) Diamond-dri ll hole Electromagnetic conducto r Gravel road, track Not e: Unit numbers correspond to those on Preliminary Map 2001F-3
SYMBOLS
(4a) Granodiorite, granite (4b) Quartz diorite, tonalite, diorite, granodiorite ( / / / with enclaves of unit 1) (3a) Gabbro, hornblendite (3b) Pyroxenite (2a) Rhyolite, massive to fragmental (2b) Feldspar-quartz porphyry (1a-h) Basalt, gabbro, amphibolite, mafic gneiss; minor volcanic breccia
LEGEND
101 40’00”0
101 40’00”0
101 25’ 00”0
101 25’00”0
54 53’00”0 54 53’00”0
54 56’00”054 56’00”0
• Fragmental rhyolite flow east of Wabishkok Lake
10
100
La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu
Roc
k/Ch
ondr
ite
Rhyolite enclave within Kotyk gabbroRhyolite unit in southwest part ofWabishkok Lake
10
100
La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu
Roc
k/Ch
ondr
ite
Wabishkok rhyolite
Flin Flon Mine rhyolite
0 10 20 30 40 50.1
1
Th/N
b
Yb/ .22
Flin Flon extension-related rhyolites
Flin Flon Mine rhyolite
Flin Flon arc assemblage
rhyolites
Wabishkok rhyolite
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.70
100
200
300
400
Zr
TiO2
Flin Flon arc assemblage
rhyolites
Flin Flon Mine rhyolite(main phase)
Zr/T
iO =
0.2
82
Zr/T
iO =
0.13
2
Zr/TiO
= 0.065
2
Zr/TiO = 0.04
2
Zr/TiO = 0.0162
Flin Flon extension-related rhyolites
Wabishkok rhyolite
10
Type F111a Archeanrhyolite (Lesher et al.,1986)
La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu
Roc
k/Ch
ondr
ite
Wabishkok rhyolite
100
Zr/ 10 Y
Ti/ 100
F1
F11
F111b
Wabishkok rhyolite
F111a