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Mar 15, 2023 285 likes •467 views

Te Tehery-Wager Geoscie ience Proje ject: Fin indings from the 20 2015 bedrock mappin ing campaign Holly Steenkamp, Canada-Nunavut Geoscience Office Natasha Wodicka, Geological Survey of Canada Christopher Lawley, Geological Survey of

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Te Tehery-Wager Geoscie ience Proje ject: Fin indings from the 20 2015 bedrock mappin ing campaign

Holly Steenkamp, Canada-Nunavut Geoscience Office Natasha Wodicka, Geological Survey of Canada Christopher Lawley, Geological Survey of Canada Tony Peterson, Geological Survey of Canada Carl Guilmette, Université Laval

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The Tehery-Wager Project

Regional geoscience initiative:

  • Targeted bedrock mapping
  • Surficial geology mapping
  • Targeted stream sediment surveys

Collaborative project:

  • Geological Survey of Canada

(GEM 2 - South Rae Activity)

  • Canada-Nunavut Geoscience Office

(SINED)

Contributions from:

  • Université Laval
  • Dalhousie University
  • University of Victoria

Duration:

  • 2 field seasons (2015/2016), outputs through ̴2019
  • University of New Brunswick
  • Université du Québec à Montréal
  • Nunavut Arctic College
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SLIDE 3

Hudson Bay Davis Strait

Project Location

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SLIDE 4

Mapping prior to 2015…

  • Reconnaissance mapping
  • Wright, 1955
  • Lord and Wright, 1967
  • Heywood, 1967
  • Gordon and Heywood,

1988 Daly Bay complex

  • Henderson et al., 1990

Wager Shear Zone

  • Panagapko et al., 2003 –

RPM

  • New reconnaissance

survey by the GSC in 2012

  • McMartin et al., 2013
  • Wodicka et al., in prep
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SLIDE 5

Project Objectives

1) Characterize and define distinct units within the Archean gneiss

  • Define their relationships with overlying supracrustal rocks
  • Snow Island suite K-feldspar porphyritic monzogranite?

2) Document stratigraphy of supracrustal belts, determine depositional ages and environments

  • Correlations to other known sequences?

3) Determine the timing, extent and degree of metamorphism and deformation in the area related to the Snowbird Tectonic Zone and/or terminal collision of the Trans-Hudson Orogeny

  • Peak pressure/temperature of metamorphism, spatial distribution
  • Development of trans-lithospheric fault systems

4) Evaluate the economic potential of the area

  • Metal and carving stone potential? Diamond potential?
  • Do large-scale faults provide favourable environments for mineralization?
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SLIDE 6

2015 Field Season

  • June 30 – Aug 2
  • 14 field crew
  • 5 camp crew
  • 1 Bell 206 LR
  • Turbo Otter supply

runs

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SLIDE 7

2015 2015 Mapp apping

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Archean Tonalite to Granodiorite

  • Biotite ± hornblende
  • Granitic injections that cut foliation

and are subsequently deformed

  • Pods, lenses, rafts of mafic rocks

(e.g. pyroxenite, diorite) and supracrustal rocks (e.g. amphibolite, calcsilicate)

  • Van Breemen et al., 2007: U-Pb

zircon crystallization ages 2699 ± 11 Ma, 2701 ± 14 Ma

  • Compositional complexity and

variability – likely more phases to identify

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SLIDE 9

Archean Monzo- to Syenogranite

  • Contains biotite, magnetite, rare muscovite
  • Foliation defined by biotite, compositional layering
  • Cut by syenite dykelets that are subsequently transposed
  • Nature of contact with Archean tonalite-granodiorite is poorly exposed
  • Unknown age
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SLIDE 10

K-Feldspar Porphyritic Monzogranite

  • Rapakivi texture, coeval gabbro/diorite phases
  • Similar characteristics to felsic plutonic rocks of the

2.6 Ga Snow Island suite

  • Mylonitic zone at contact to underlying orthogneiss

K-Feldspar Monzogranite Tonalite

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SLIDE 11

Supracrustal Rocks

  • Occur as panels between layers of Archean orthogneiss
  • Granulite-facies mineral assemblages with partial retrogression

to amphibolite-facies phases

  • Include:
  • Sill-Bt quartzite (3.7-2.55 Ga detritus – Ferderber et al., 2013)
  • Grt-Bt±Sill±melt semipelite with local psammite and pelite layers
  • Grt-Cpx amphibolite
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SLIDE 12

Supracrustal Rocks

  • Includes:
  • Garnetite
  • Iron formation
  • Ultramafic boudins
  • Calcsilicate
  • Rare marble
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Ultrapotassic Intrusions

Cpx-Bt Syenite Cpx Monzonite

  • Zoned, bimodal intrusions with magma mixing textures
  • Well exposed plutonic bodies, only 1 minette dyke identified
  • Correlative with Christopher Island formation and Martel syenite?

Phlg Clinopyroxenite

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SLIDE 14

Undeformed Granitic Rocks

  • Monzogranite to syenogranite dykes and sills
  • Homogeneous texture and mineralogy
  • Rare fluorite
  • Contain xenoliths of orthogneiss and paragneiss
  • Possibly correlative with felsic rocks of the 1.85-1.81 Ga Hudson

suite

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SLIDE 15

Economic Considerations

  • Stream sediment and till sample findings of McMartin et al. (2013)

highlight locations for follow-up work:

  • Gossanous metasedimentary rocks – anomalous Ag, Au, Bi, Cu and

presence of safflorite

  • Ultrapotassic intrusions – REE potential in most fractionated parts
  • f the plutons
  • Diamond potential
  • Nanuq property (Peregrine Diamonds)
  • Carving stone
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SLIDE 16

Thank you!

  • Hamlet of Chesterfield Inlet
  • Hudson Bay Helicopters
  • Ookpik Aviation
  • Polar Continental Shelf Program
  • Discovery Mining

Also See: Wodicka et al., 2015 – GSC Open File 7970, 2015 field report McMartin et al., 2015 – Poster Session at Arena – 2015 Surficial mapping Coming Soon – Steenkamp et al., 2015 – CNGO Summary of Activities report