Structural geology and gold metallogeny of the New Britannia mine area, Snow Lake, Manitoba
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1 Structural geology and gold metallogeny of the New Britannia mine area, Snow Lake, Manitoba Chris Beaumont-Smith Manitoba Geological Survey Boundary zone New Britannia
2 Trans-Hudson Orogen 50 km 100 km 100 km Modified Zwanzig, H.V. 1999
3 Flin Flon-Snow Lake Deposits PRE-ACCRETION ASSEMBLAGES (>1.88 Ga) JUVENILE ARC ASSEMBLAGES OCEAN FLOOR ASSEMBLAGES EVOLVED ARC ASSEMBLAGE SYN/POST-ACCRETION ROCKS (<1.88 Ga) FELSIC-MAFIC PLUTONS (>1.84, <1.84 Ga) SUCCESSOR ARC & BASIN DEPOSITS Missi suite Burntwood suite Major fault (<1.84 Ga) Gold deposit
4 Snow Lake Deposits 55º 15' Ca Ma Amisk Group volcanic rocks Snow Lake 10km Ca , 1830 Ma plutonic rocks Ca Ma Burntwood Group turbidites Ca Ma Missi Group fluvialalluvial sedimentary rocks Successor-arc pluton, basin deposits Late plutons Missi Group Burntwood Group Early plutons and gneiss Successor-arc plutons Layered mafic sills Early plutons, mixed gneiss Major fault Early juvenile assemblages Arc volcanic rocks Arc-rift basalt Ocean-floor basalt
5 Snow Lake Geology SQUALL SQUALL LAKE LAKE Margaret zones Moon Gertie K7 K7 K5 K5 Allochthonous volcanic rocks bound by younger sedimentary rocks Syn- to post-metamorphic thrusting South zone HERBLET HERBLET LAKE LAKE Birch zone McLeod McLeod Road Road Thrust Thrust No. 3 zone Birch Birch Fault Fault Snow Lake Fault New Britannia mine Missi Group arenite Burntwood Group turbidites Gabbro Mafic volcaniclastic rocks Basalt Sneath Lake pluton Felsic volcaniclastic rocks Fault (thrust, other) Road Gold deposit Gold occurrence SNOW SNOW LAKE LAKE New Britannia
6 Stratigraphy SQUALL LAKE K7 K5 Amygdaloidal dacite Margaret zones Moon Gertie South zone HERBLET LAKE Birch zone McLeod Road Thrust No. 3 zone Birch Fault Snow Lake Fault New Britannia mine Missi Group arenite Burntwood Group turbidites Gabbro Mafic volcaniclastic rocks Basalt Sneath Lake pluton Felsic volcaniclastic rocks SNOW LAKE Fault (thrust, other) Road Gold deposit Gold occurrence Amygdaloidal tuff breccia 0 500
7 Stratigraphy SQUALL LAKE K7 K5 Aphyric tuff breccia Margaret zones Moon Gertie South zone HERBLET LAKE Birch zone McLeod Road Thrust No. 3 zone Birch Fault Snow Lake Fault New Britannia mine Missi Group arenite Burntwood Group turbidites Gabbro Mafic volcaniclastic rocks Basalt Sneath Lake pluton Felsic volcaniclastic rocks SNOW LAKE Fault (thrust, other) Road Gold deposit Gold occurrence Bedded lapilli tuff 0 500
8 Stratigraphy SQUALL LAKE K7 K5 Mafic lapilli tuff Margaret zones Moon Gertie South zone HERBLET LAKE Birch zone McLeod Road Thrust No. 3 zone Birch Fault Snow Lake Fault New Britannia mine Missi Group arenite Burntwood Group turbidites Gabbro Mafic volcaniclastic rocks Basalt Sneath Lake pluton Felsic volcaniclastic rocks SNOW LAKE Fault (thrust, other) Road Gold deposit Gold occurrence Bedded lapilli tuff 0 500
9 Stratigraphy SQUALL SQUALL LAKE LAKE K7 K7 K5 K5 Pillowed basalt Margaret zones Moon Gertie South zone HERBLET HERBLET LAKE LAKE Birch zone No. 3 zone McLeod McLeod Road Road Thrust Thrust Snow Lake Fault Birch Birch Fault Fault New Britannia mine Mafic sediment Missi Group arenite Burntwood Group turbidites Gabbro Mafic volcaniclastic rocks Basalt Sneath Lake pluton Felsic volcaniclastic rocks Fault (thrust, other) Road Gold deposit Gold occurrence SNOW SNOW LAKE LAKE
10 Stratigraphy SQUALL SQUALL LAKE LAKE K7 K7 K5 K5 Bedded lapilli tuff Margaret zones Moon Gertie South zone HERBLET HERBLET LAKE LAKE Birch zone McLeod Road Thrust No. 3 zone Birch Birch Fault Fault McLeod Road Thrust Snow Lake Fault New Britannia mine Missi Group arenite Burntwood Group turbidites Gabbro Mafic volcaniclastic rocks Basalt Sneath Lake pluton Felsic volcaniclastic rocks Fault (thrust, other) Road Gold deposit Gold occurrence SNOW SNOW LAKE LAKE
11 Stratigraphy SQUALL LAKE K7 K5 Staurolite schist Margaret zones Moon Gertie South zone HERBLET LAKE Birch zone No. 3 zone Snow Lake Fault Snow Lake Fault McLeod Road Thrust McLeod Road Thrust Birch Fault Birch Fault New Britannia mine Cross-bedded arenite Missi Group arenite Burntwood Group turbidites Gabbro Mafic volcaniclastic rocks Basalt Sneath Lake pluton Felsic volcaniclastic rocks Fault (thrust, other) Road Gold deposit Gold occurrence SNOW LAKE 0 500
12 Gold in Manitoba 2008 Stratigraphy Granoblastic gabbro SQUALL SQUALLLAKE LAKE K7 K7 K5 K5 Margaret Margaretzones zones Moon MoonGertie Gertie South Southzone zone HERBLET HERBLET LAKE LAKE tlt auul FFa chh rirc BBi Birch Birchzone zone MM ccl Lee ood dr No. No.33zone zone Ro oaa dd TTh hrru SSnno uss owwllak tt akeefa Fauultl t New NewBritannia Britanniamine mine Missi MissiGroup Grouparenite arenite Burntwood BurntwoodGroup Groupturbidites turbidites Gabbro Gabbro Mafic Maficvolcaniclastic volcaniclasticrocks rocks SNOW SNOWLAKE LAKE Basalt Basalt Sneath SneathLake Lakepluton pluton Felsic Felsicvolcaniclastic volcaniclasticrocks rocks Fault Fault(thrust, (thrust,other) other) Road Road Gold Golddeposit deposit Gold Goldoccurrence occurrence Ophitic gabbro
13 F 1 Folding SQUALL LAKE LAKE K7 K5 S-asymmetrical F 1 fold Margaret zones Moon Gertie South zone HERBLET LAKE LAKE Birch zone McLeod McLeod Road Road Thrust Thrust No. 3 zone Birch Birch Fault Fault Snow Lake Fault New Britannia mine Missi Group arenite Burntwood Group turbidites Gabbro Mafic volcaniclastic rocks Basalt Sneath Lake pluton Felsic volcaniclastic rocks Fault (thrust, other) Road Gold deposit Gold occurrence SNOW LAKE LAKE Unfolded F
14 F 2 Folding SQUALL LAKE LAKE K7 K5 Margaret zones Moon Gertie South zone HERBLET LAKE LAKE Birch zone McLeod McLeod Road Road Thrust Thrust No. 3 zone Birch Birch Fault Fault S-asymmetrical S 2 Snow Lake Fault New Britannia mine Missi Group arenite Burntwood Group turbidites Gabbro Mafic volcaniclastic rocks Basalt Sneath Lake pluton Felsic volcaniclastic rocks Fault (thrust, other) Road Gold deposit Gold occurrence SNOW LAKE LAKE F 2 mineralization
15 D 2 Thrust Faulting SQUALL LAKE LAKE K7 K5 Margaret zones Moon Gertie South zone HERBLET LAKE LAKE Birch zone McLeod McLeod Road Road Thrust Thrust No. 3 zone Birch Birch Fault Fault Snow Lake Fault New Britannia mine Missi Group arenite Burntwood Group turbidites Gabbro Mafic volcaniclastic rocks Basalt Sneath Lake pluton Felsic volcaniclastic rocks Fault (thrust, other) Road Gold deposit Gold occurrence SNOW LAKE LAKE
16 F 3 Folding SQUALL LAKE LAKE K7 K5 Margaret zones Moon Gertie South zone HERBLET LAKE LAKE Birch zone McLeod McLeod Road Road Thrust Thrust No. 3 zone Birch Birch Fault Fault Snow Lake Fault New Britannia mine Missi Group arenite Burntwood Group turbidites Gabbro Mafic volcaniclastic rocks Basalt Sneath Lake pluton Felsic volcaniclastic rocks Fault (thrust, other) Road Gold deposit Gold occurrence SNOW LAKE LAKE F 3 chevron folds
17 Gold Mineralization Structurally controlled gold mineralization Mineralization focussed at stratigraphic contacts Arsenopyrite association High degree of silicification Pre- to Syn-mineralization potassium metasomatism and carbonate alteration
18 New Britannia Mineralization Hogg, 1957 Alexis Minerals
19 New Britannia Mineralization Hogg, 1957
20 New Britannia Mineralization Biotite-muscovitecarbonate-rich matrix Boudinaged silicification Ladder veins Howe Sound Fault
21 Boundary Zone E N Quartz Pyroxene porphyritic dyke Pyroxene porphyritic tuff breccia Mafic sediment Felsic lapilli tuff Felsic tuff breccia Amygdaloidal dacite Geological contact Quartz vein Overturned bedding S 2 foliation 2 Lineation, stretching, L 2 intersection, F E N 0 10 Overturned stratigraphy
22 Boundary Zone E N Quartz Pyroxene porphyritic dyke Pyroxene porphyritic tuff breccia Mafic sediment Felsic lapilli tuff Felsic tuff breccia Amygdaloidal dacite Geological contact Quartz vein Overturned bedding S 2 foliation 2 Lineation, stretching, L 2 intersection, F E N 0 10 Overturned stratigraphy
23 No. 3 Zone Alexis Minerals
24 No. 3 Zone Reactive veins Alexis Minerals
25 Schematic Cross Section Alexis Minerals
26 No. 3 Zone Biotite alteration Strain gradient N Covered Carbonate alteration Quartz vein Altered mafic volcaniclastic 5
27 Summary PMAP Mineralization Deformation Remobilization Shear-hosted Accretion Brittle Faulting? Metamorphism D 1 D 2 D 3 D 4 D 5 Peak Sedimentation Burntwood Group Missi Group Magmatism Volcanism Pre-Accretion Missi Group U-Pb Age Data Zircon U-Pb Age, 2 error Zircon Pb-Pb Age, 2 error Age (Ma)
28 References Hogg, N. 1957: Nor-Acme mine; in Structural Geology of Canadian Ore Deposits, Canadian Institute of Mining and Metallurgy, Congress Volume, p Zwanzig, H.V. 1999: Structure and stratigraphy of the south flank of the Kisseynew Domain in the Trans-Hudson Orogen, Manitoba: implications for Ga collision tectonics; in NATMAP Shield Margin Project, Volume 2, Canadian Journal of Earth Sciences, v. 36, no. 11, p
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