Mist Mis y Lake y Lak Mapping Progr ogr
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1 Far North Geomapping Initiative: Preliminary Results From Geological Mapping in the Misty Lake Area, Northwestern Manitoba Paul Kremer, Chris Couëslan, Anders Carlson (MGS) Nicole Rayner (GSC)
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3 Misty Lake Mapping Program Si k b d k i Six week bedrock mapping Area dominated by metasedimentary rocks of the Wollaston Supergroup - correlative to established stratigraphy in Saskatchewan Structural inliers of Archean basement rock Widespread granitic magmatism Post-metamorphic alkali metasomatism - Potential for metasomatic-related mineral deposits
4 Geological Framework Wollaston Supergroup p comprises sedimentary succession(s) overlying the southestern Hearne craton margin Stratigraphy represents various stages in an evolving rift passive margin foreland/backarc basin setting From Tran et al., 2008
5 Wollaston Supergroup Stratigraphy is well-established in Saskatchewan Sequence I (Courtenay Lake and Souter Lake Groups) p) Conglomerate and arkose ± volcanic rocks; quartzite and semi-pelite Sequence ence II (Daly Lake Group) Graphitic pelite and semi-pelite with minor quartzite, calcsilicate and marble, ct-gt-sill semi-pelite and pelite, arkose Sequence III (Geikie River Group) Conglomerate, arkose, calcareous arkose, calcsilicate and marble From Tran et al., 2008
6 Archean Basement Rocks in the Misty Lake Area Foliated to locally ll gneissic i tonalite to granodiorite Forms the core of a structural dome 2584 ± 7 Ma crystallization age
7 Archean Basement Rocks in the Misty Lake Area
8 Metasedimentary rocks in the Misty Lake Area Psammitic to pelitic gneiss Gt-cd ± sill porphyroblastic Variably migmatitic Leucogranitic to granodioritic anatectic dikes Leucogranitic to granodioritic anatectic dikes Base of sequence? Detrital zircon analyses consistent with derivation from local Archean rocks Ga dominates; minor 1.94 Ga
9 Metasedimentary rocks in the Misty Lake Area Psammitic to pelitic gneiss Gt-cd ± sill porphyroblastic Variably migmatitic Leucogranitic to granodioritic anatectic dikes Leucogranitic to granodioritic anatectic dikes Base of sequence? Detrital zircon analyses consistent with derivation from local Archean rocks Ga dominates; minor 1.94 Ga
10 Metasedimentary Rocks in the Misty Lake Area Arkosic to semi-pelitic gneiss Characterized by increase in detrital and metamorphic kfsp Cd-porphyroblastic Syenogranitic anatectic dikes Rare marble and calsilicate layers
11 Metasedimentary Rocks in the Misty Lake Area Quartz and feldspathic arenite to calcareous arenite Well-bedded, medium-grained Rare calcsilicate interlayers Diopside veins Detrital zircon analyses similar to psammitic rocks Addition to Ga zircons
12 Metasedimentary Rocks in the Misty Lake Area Quartz and feldspathic arenite to calcareous arenite Well-bedded, medium-grained Rare calcsilicate interlayers Diopside veins Detrital zircon analyses similar to psammitic rocks Addition to Ga zircons
13 From Tran et al., 2008
14 From Tran et al., 2008 From Tran et al., 2003
15 2006 Mapping (Bohm and Anderson, 2006) 2010 Mapping
16 2006 Results 2010 Results
17 Structure and Metamorphism D 1 Rarely preserved F 1 isoclinal folds Composite S 0 -S 1 transposition foliation D 2 di i h i li l NE-trending, tight to isoclinal upright folds, shallowly to moderately NE and SW plunging Weak to moderate S 2 foliation Synchronous with peak metamorphism D 3 NW-trending, gentle to open folds
18 Structure and Metamorphism D 1 Rarely preserved F 1 isoclinal folds Composite S 0 -S 1 transposition foliation D 2 di i h i li l NE-trending, tight to isoclinal upright folds, shallowly to moderately NE and SW plunging Weak to moderate S 2 foliation Synchronous with peak metamorphism D 3 NW-trending, gentle to open folds
19 Structure and Metamorphism K-feldspar porphyroblastic arkosic biotite gneiss: C and kbar Psammitic to semi-pelitic gneiss: C and kbar
20 Structure and Metamorphism K-feldspar porphyroblastic arkosic biotite gneiss: C and kbar Psammitic to semi-pelitic gneiss: C and kbar
21 Alkali Metasomatites Zones of moderate to intense metasomatism Affect both metasedimentary and granitic rocks Characterized by alb-cpx-amph p ± fl ± scap ± calc Partial to complete replacement of fhost rock ktypes Locally marked by U, Th 4-5x background values, minor HREE enrichment relative unmetasomatized equivalents
22 Alkali Metasomatites
23 Alkali Metasomatites
24 Alkali Metasomatites
25 Economic Considerations Alkali li metasomatites Metasomatite-related U deposits Carbonatite-hosted REE-Nb-F Peralkaline granitoid Zr-Nb-Y-REE-F LREE enrichment up to 10% 4.39% Ce, 2.91% La, and 1.53% Nd (CanAlaska Uranium Ltd., 2009) Strata correlative to the Daly Lake Group in Saskatchewan Basement-hosted U Synorogenic U Karin Lake, Sand dlake, BurdLake occurrences Stratiform Pb-Zn Sito Lake, Fable Lake Strataboundt Cu
26 Summary Good correlation between metasedimentary rocks in the Misty Lake area and the Wollaston Supergroup in Saskatchewan Daly Lake and Geikie River Groups Sediments are locally sourced from Archean basement rocks exposed in the area Peak metamorphism: C, 5-6 kbar Intense alkali metasomatism suggests the potential for a variety of mineral deposit types
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