Paleoproterozoic Gold Metallogeny of Manitoba
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1 Farley Paleoproterozoic Gold Metallogeny of Manitoba Chris Beaumont-Smith Manitoba Geological Survey MacLellan Burnt Timber Northstar New Britannia
2 Orogenic Lode Gold Deposits The Model Accretionary plate margin Collisional orogenesis Crustal thickening Prograde metamorphism Plate margin Evolved crust Accretion Juvenile crust Arc volcanism Subduction Juvenile crust Dehydration reactions Collision Evolved crust Metamorphogenic fluids Terrane bounding faults (conduits) Brittle - ductile transition Syn-metamorphic, syn-kinematic mineralization Evolved crust After SDA
3 Trans-Hudson Orogen After HWZ 50 km 100 km 100 km
4 Trans-Hudson Orogen Athabasca Basin Saskatchewan Manitoba N Reindeer Zone Phanerozoic Sedimentary Rocks Paleoproterozoic Sedimentary Rocks Trans-Hudson Orogen Continental Arc Plutonic Rocks Marginal/Collisional Basin: Sedimentary and Plutonic Rocks Arc Plutons/ Mixed Gneisses Arc Volcanic and Plutonic Rocks 106 W Superior Craton 54 N W Continental Margin Deposits/Reworked Basement Archean Archean Cratons/ Pikwitonei Granulite Faults
5 Northern Trans-Hudson Orogen Saskatchewan Manitoba Lynn Belt River Rusty Belt Partridge Breast Belt Wathaman/Chipewyan Batholith Southern Indian Domain Kisseynew Domain La Ronge/Lynn Domain plutonic rocks La Ronge/Lynn Domain supracrustal rocks Superior Province South Granville Structural zone 50 km
6 Time(s) Depth(km) LEAF RAPIDS DOMAIN N 0 Crustal Architecture KISSEYNEW NORTH FLANK 0S 4 Greenstone Belt- Granitoid Terrane 12 8 Kisseynew Domain Sediments 24 Time (s) Depth (km) Crustal Architecture favourable for orogenic gold formation
7 Lynn Greenstone Belt Ca & 1855 Ma volcanic rocks Rock/Chondrite Fox porphyritic basalt Hatchet basalt Zed Lynn Barrington Barrington (S) basalt Transitional basalt Divisions B & D, Lynn - Eagle area Barrington area Johnson Shear Zone Rock/Chondrite Rock/Chondrite 10 Cockeram basalt Intrusive rocks (unknown age) Post Sickle Intrusive rocks ( Ga) Granite, granodiorite Tonalite, quartz diorite Sickle Group Burntwood Group Ralph conglomerate Zed greywacke 1 Hughes calc-alkaline suite Pool Intrusive Suite ( Ga) Granite, granodiorite Tonalite, granodiorite Diorite, quartz diorite Gabbro kilometres Wasekwan Group Volcanogenic sediments Rhyolite Dacite MORB-like basalt Arc tholeiite trans. to E-MORB Weakly depleted arc tholeiite Depleted arc tholeiite Enriched arc tholeiite Calc-alkaline basalt to andesite Arc Tholeiite Undivided Wasekwan
8 Deformational Events Deformation Regional Fabrics Tectonic Signifigance D 1 Slaty cleavage Juxtaposition of volcanic units D 2 Tight to isoclinal F 2 folds and regional S 2 foliation. Latestage dextral transpressive shear zones Transposition of greenstone belt Peak lower amphibolite facies metamorphism Ca Ma D 3 D 4 Close NW trending F 3 folds S crenulation cleavage 3 Close NE trending F 4 folds S crenulation cleavage 4 Local map pattern changes NE-SW trending warps of the greenstone belt D 5 Open to close N-S trending F folds 5 N-S macroscopic warping of the greenstone belt D 6 E-W trending F 6 kink folds and pseudotachylite Sinistral strike-slip reactivation of D shear zones 2
9 Increasing strain Tight D 2 Evolution Folding Shear zone Fold Packet found in shear zone remnant of earlier folding
10 Southern Trans-Hudson Orogen Athabasca Basin Saskatchewan Manitoba N Reindeer Zone Phanerozoic Sedimentary Rocks Paleoproterozoic Sedimentary Rocks Trans-Hudson Orogen Continental Arc Plutonic Rocks Marginal/Collisional Basin: Sedimentary and Plutonic Rocks Arc Plutons/ Mixed Gneisses Arc Volcanic and Plutonic Rocks 106 W Superior Craton 54 N W Continental Margin Deposits/Reworked Basement Archean Archean Cratons/ Pikwitonei Granulite Faults
11 Flin Flon-Snow Deposits Gold deposit
12 Puffy and Nokomis s Puffy mine Puffy Nokomis Nokomis deposit kilometres No outcrop Intrusive rocks Quartz porphyry Biotitie leucogranite to tonalite Foliated granodiorite, tonalite Foliated granite, granodiorite Leucogranodiorite to tonalite Tonalite to quartz diorite Ferro-gabbro Tonalite, quartz diorite Biotite gneiss Gabbro, diorite Burntwood Metamorphic Suite Garnet-biotite gneiss +/- sillimanite Garnet-biotite gneiss and migmatite Missi Group Conglomerate gneiss Quatrzofeldpathic gneiss Amphibolite Amisk Group Felsic gneiss Intermediate volcaniclastic rocks Pillowed basalt Basalt, basaltic andesite Tholeiitic basalt Andesite, intermediate gneiss
13 Structural Development SQUALL LAKE LAKE Margaret zones K7 K5 Moon Gertie South zone McLeod McLeod Road Road Thrust Thrust Birch zone No. 3 zone Birch Birch Fault Fault F 1 Folding F 2 Folding S HERBLET LAKE LAKE D 2 Thrust faulting F 3 Folding Snow Fault New Britannia mine Missi Group arenite Burntwood Group turbidites Gabbro Mafic volcaniclastic rocks Basalt Sneath pluton Felsic volcaniclastic rocks Fault (thrust, other) Road Gold deposit Gold occurrence SNOW LAKE LAKE metres metres
14 Crustal Architecture BASIN / SUCCESSOR ARC Missi Group Burntwood Group Plutons Kississing W N E ARC assemblages Flin Flon & Fourmile Is Snow OCEAN FLOOR unit Ponton L N ARC-RIFT units Moody L & Josland W S 10 km 2 km S 4 km File File E
15 Northern THO Deposits Athabasca Basin Saskatchewan Manitoba N Reindeer Zone Phanerozoic Sedimentary Rocks Paleoproterozoic Sedimentary Rocks Trans-Hudson Orogen Continental Arc Plutonic Rocks Marginal/Collisional Basin: Sedimentary and Plutonic Rocks Arc Plutons/ Mixed Gneisses Arc Volcanic and Plutonic Rocks 106 W Superior Craton 54 N W Continental Margin Deposits/Reworked Basement Archean Archean Cratons/ Pikwitonei Granulite Faults
16 Lynn Gold Deposits Mafic-Hosted Goldsand Keewatin River Eagle Arbour Zed Berge Dot MacLellan Dot mine K-Zones Hughes River Farley Mine Barrington Lynn Chepil Hughes Motriuk F rancis Eldon Cockeram Barrington River Cartwright McBride Gemmell TA 1 BT Mine Anson Bonanza Westdahl One Island Johnson Shear Zone Adam Craig Laurie Todd Laurie River Eager Dunphy s Irene Wilmot Stear Counsell Story May Wasekwan Intrusive rocks (unknown age) Post Sickle Intrusive rocks ( Ga) Granite, granodiorite Tonalite, quartz diorite Sickle Group Burntwood Group Ralph conglomerate Zed greywacke Lasthope Sickle Pool Intrusive Suite ( Ga) Granite, granodiorite Tonalite, granodiorite Diorite, quartz diorite Gabbro kilometres Wasekwan Group Volcanogenic sediments Rhyolite Dacite MORB-like basalt Arc tholeiite trans. to E-MORB Weakly depleted arc tholeiite Depleted arc tholeiite Enriched arc tholeiite Calc-alkaline basalt to andesite Arc Tholeiite Undivided Wasekwan
17 True North Gold in Manitoba Short Course BT Deposit me me me me me Mafic-Hosted Shortie mn mn mn Mine North T1 FAULT BTE metres NAD 84/ T1 FAULT Legend Hangingwall basalt/andesite Intermediate tectonite Alteration zone (Silica + Pyrite + Carbonate) Ore outline 300m bench Footwall basalts (tectonite) Crenulation cleavage (S ) 4 Differentiated layering (S ) 2 Stretching lineation Fold axis F, 2 F 4 Shear band cleavage mn mn mn me me me me me
18 BT Deposit Mafic-Hosted Quartz-sulphide veins Silicified ore
19 BT Geochemistry BTE95-1 Gabbro HW Basalt Aplite Distance (m) Int. Tectonite T1 Fault Granitic Dykes FW Basalt CaO Wt% MgO Wt% TiO2 Al2O3 Fe2O3T Wt% Wt% Wt% SiO2 Wt% BTE95-1 Gabbro HW Basalt Aplite Distance (m) Int. Tectonite T1 Fault Granitic Dykes FW Basalt log ppb Au S Wt% LOI Wt% K2O Wt% Na2O Wt%
20 Lynn Gold Deposits Ultramafic-Hosted Goldsand Keewatin River Eagle Arbour Zed Berge Dot MacLellan Dot mine K-Zones Hughes River Farley Mine Barrington Lynn Chepil Hughes Motriuk F rancis Eldon Cockeram Barrington River Cartwright McBride Gemmell TA 1 BT Mine Anson Bonanza Westdahl One Island Johnson Shear Zone Adam Craig Laurie Todd Laurie River Eager Dunphy s Irene Wilmot Stear Counsell Story May Wasekwan Intrusive rocks (unknown age) Post Sickle Intrusive rocks ( Ga) Granite, granodiorite Tonalite, quartz diorite Sickle Group Burntwood Group Ralph conglomerate Zed greywacke Lasthope Sickle Pool Intrusive Suite ( Ga) Granite, granodiorite Tonalite, granodiorite Diorite, quartz diorite Gabbro kilometres Wasekwan Group Volcanogenic sediments Rhyolite Dacite MORB-like basalt Arc tholeiite trans. to E-MORB Weakly depleted arc tholeiite Depleted arc tholeiite Enriched arc tholeiite Calc-alkaline basalt to andesite Arc Tholeiite Undivided Wasekwan
21 Legend Granite Mineralization Iron formation MacLellan Deposit Ultramafic-Hosted Greywacke-siltstone Dacite Mafic sedimentary rocks Picritic basalt Aphyric basalt Porphyritic basalt Mafic breccia, heterolithic breccia Geological contact Powerline Road Dot MacLellan mine Scale 1: kilometres 1
22 REE / Rocks-Chondrites McDonough & Sun, 1995 MacLellan Deposit Ultramafic-Hosted Altered 100 Unaltered 10 1 La Ce Pr Nd PmSm Eu Gd Tb Dy Ho Er Tm Yb Lu
23 Lynn Gold Deposits Felsic-Hosted Goldsand Keewatin River Eagle Arbour Zed Berge Dot MacLellan Dot mine K-Zones Hughes River Farley Mine Barrington Lynn Chepil Hughes Motriuk F rancis Eldon Cockeram Barrington River Cartwright McBride Gemmell TA 1 BT Mine Anson Bonanza Westdahl One Island Johnson Shear Zone Adam Craig Laurie Todd Laurie River Eager Dunphy s Irene Wilmot Stear Counsell Story May Wasekwan Intrusive rocks (unknown age) Post Sickle Intrusive rocks ( Ga) Granite, granodiorite Tonalite, quartz diorite Sickle Group Burntwood Group Ralph conglomerate Zed greywacke Lasthope Sickle Pool Intrusive Suite ( Ga) Granite, granodiorite Tonalite, granodiorite Diorite, quartz diorite Gabbro kilometres Wasekwan Group Volcanogenic sediments Rhyolite Dacite MORB-like basalt Arc tholeiite trans. to E-MORB Weakly depleted arc tholeiite Depleted arc tholeiite Enriched arc tholeiite Calc-alkaline basalt to andesite Arc Tholeiite Undivided Wasekwan
24 Gemmell Felsic-Hosted meters Felsic volcanic (region/outcrop) Porphyritic gabbro
25 Lynn Gold Deposits Iron Formation-Hosted Goldsand Keewatin River Eagle Arbour Zed Berge Dot MacLellan Dot mine K-Zones Hughes River Farley Mine Barrington Lynn Chepil Hughes Motriuk F rancis Eldon Cockeram Barrington River Cartwright McBride Gemmell TA 1 BT Mine Anson Bonanza Westdahl One Island Johnson Shear Zone Adam Craig Laurie Todd Laurie River Eager Dunphy s Irene Wilmot Stear Counsell Story May Wasekwan Intrusive rocks (unknown age) Post Sickle Intrusive rocks ( Ga) Granite, granodiorite Tonalite, quartz diorite Sickle Group Burntwood Group Ralph conglomerate Zed greywacke Lasthope Sickle Pool Intrusive Suite ( Ga) Granite, granodiorite Tonalite, granodiorite Diorite, quartz diorite Gabbro kilometres Wasekwan Group Volcanogenic sediments Rhyolite Dacite MORB-like basalt Arc tholeiite trans. to E-MORB Weakly depleted arc tholeiite Depleted arc tholeiite Enriched arc tholeiite Calc-alkaline basalt to andesite Arc Tholeiite Undivided Wasekwan
26 Farley Deposit Iron Formation-Hosted WENDY PIT EAST PIT WENDY ZONE SOUTH ZONE EAST ZONE SOUTHEAST ZONE EAST FAULT WENDY FAULT metres Granodiorite, diorite Metasediments Iron formation Rhyolite Dacite Basalt Ore zone Geological contact Fault zone
27 Farley Deposit
28 Southern THO Deposits Athabasca Basin Saskatchewan Manitoba N Reindeer Zone Phanerozoic Sedimentary Rocks Paleoproterozoic Sedimentary Rocks Trans-Hudson Orogen Continental Arc Plutonic Rocks Marginal/Collisional Basin: Sedimentary and Plutonic Rocks Arc Plutons/ Mixed Gneisses Arc Volcanic and Plutonic Rocks 106 W Superior Craton 54 N W Continental Margin Deposits/Reworked Basement Archean Archean Cratons/ Pikwitonei Granulite Faults
29 Flin Flon-Snow Deposits Gold deposit
30 Snow Deposits SQUALL LAKE K7 K5 Margaret zones Moon Gertie South zone HERBLET LAKE Birch zone McLeod Road Thrust No. 3 zone Birch Fault Missi Group arenite Burntwood Group turbidites Gabbro Mafic volcaniclastic rocks Basalt Sneath pluton Felsic volcaniclastic rocks Fault (thrust, other) Road Gold deposit Gold occurrence New Britannia mine SNOW LAKE metres
31 New Britannia Mineralization
32 New Britannia Mineralization Biotite-muscovitecarbonate-rich matrix Boudinaged silicification Ladder veins Howe Sound Fault
33 No. 3 Zone Vertical Section 10200E
34 No. 3 Zone Biotite alteration Strain gradient N Carbonate alteration Covered Quartz vein Altered mafic volcaniclastic 5 metres
35 Birch Zone Vertical Section 9050E
36 Schematic Cross-Section
37 Summary Trans-Hudson Orogen is underexplored for gold Structural traps most common, but chemical traps also important The tectono-metamorphic history is favourable Trans-Hudson Orogen has favourable geology Regional shear zone development (fluid conduits) at the appropriate time (near syn-peak metamorphism) Trans-Hudson Orogen has favourable crustal architecture
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