geochemistry and economic potential of tectonic terranes ... · paul gilbert. kisseynew lake...
TRANSCRIPT
-
Geochemistry and economic potential of tectonic terranes at the north flank
of the Flin Flon Belt.
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
HEAR
NE
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 Aim
ee
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 Aim
ee
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 BlockTectonic
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 (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
-
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 2Syncline(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 BlockTectonic
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
-
0 1 2 3 4 5 6 7 8 9 100.0
0.5
1.0
1.5
2.0
2.5
TiO2
MgO
Lac Aimee Transitional(arc / MORB-like)
Animus Lake N-MORB
JUVENILE ARC
OCEAN-FLOOR
-
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 2Syncline(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
-
• Fragmental rhyolite flow east of Wabishkok Lake
-
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
-
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/T iO
= 0.06
5
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
-
Fault Blocks Tectonic AffinityBlock Arc E-MORB N-MORB Transitional Felsic volc Turbidites Rifting
Wabishkok + +
Lac A imée + + + + +
Sourdough + +
Animus + +
Mikanagan + + +
Dismal + ? ?
+
+
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