Stratigraphic, volcanologic and sedimentological architecture of the Swayze area, Abitibi greenstone belt

Transcription

1 Stratigraphic, volcanologic and sedimentological architecture of the Swayze area, Abitibi greenstone belt

2 Swayze? Swayze Timmins DPFZ

3 Swayze greenstone belt Geology map Nat River complex Slate Rock DZ DPZ Deerfoot DZ Kapuskasing structural zone Foleyet timber Rd. Kenogammisi batholith Major deformation zones RDZ Mallard Rd.

4 Swayze greenstone belt Nomenclature and general Stratigraphy Ayer and Trowell (2002)

5 Agenda 1) Overall goals 2) People 3) Historical mining and known deposits 4) The sedimentary basins of Swayze unconformities, provenance and depositional timing 5) Sedimentary interface zones the importance of banded iron formation for the Swayze stratigraphy and syngenetic mineralization 6) Geochronology map of Swayze: The emerging of different volcanic terrains 7) Future work 8) Bonus slide preliminary seismic profile through Swayze

6 The Swayze transect Overall Goals Through transect mapping and transect scale research the goals are to: Identify and map critical rock units throughout the belt Improve the stratigraphy and architecture of key volcanic and sedimentary successions and their internal relationships (thereby improving further geophysical interpretations - e.g., seismic and MT) Solve the question whether the volcanic stratigraphy represents a continuum or its comprised of an amalgamation of unrelated volcanic terrains? Assess the potential for base and precious metal mineralization

7 The Swayze transect People Rasmus Haugaard (Metal Earth) Tom Gemmell (OGS and PhD student w. Metal Earth) Msc and Bsc students Arthur Blake, Msc ( ) - Jefferson VMS deposit Sean Hofman, Bsc ( ) - Jefferson VMS deposit Colt Meyer, Bsc ( ) - Erosional unconformity Lawraine Mogashoa Msc ( ) - Geological and Geophysical modelling

8 Swayze - known deposits and mine sites Nat River complex DPZ Kapuskasing structural zone Joburke: oz Au Foleyet timber Rd. Swayze: oz Au Kenogammisi batholith (Abitibi greenstone belt: 180 Moz Au) Rundle deposit Jefferson VMS prospect Major deformation zones Kenty deposit Jerome: oz Au Côte Gold deposit: >8 Moz Namex deposit

9 The Swayze transect The sedimentary basins of Swayze Nat River complex North Swayze basin DPZ Kapuskasing structural zone <2696 Ma <2688 Ma Foleyet timber Rd. Kenogammisi batholith South Swayze basin <2690 Ma

10 The Swayze transect South Swayze basin N

11 The Swayze transect South Swayze basin

12 The Swayze transect South Swayze basin - Unconformities Conglomerate Tonalite ~2730 Ma Granite boulder

13 The Swayze transect South Swayze basin - Unconformities

14 The Swayze transect South Swayze basin - Unconformities

15 The Swayze transect The sedimentary basins of Swayze Nat River complex North Swayze basin DPZ Kapuskasing structural zone <2696 Ma <2688 Ma Foleyet timber Rd. Kenogammisi batholith South Swayze basin <2690 Ma

16 The Swayze transect North Swayze basin Sandstone Conglomerate Sandstone Conglomerate Conglomerate

17 The Swayze transect The sedimentary basins Detrital zircons 2690 Ma South Swayze sandstone 2725 Ma South Swayze sandstone n=113 < 5% discordant (113/159 total) North Swayze sandstone 2700 Ma 2820 Ma 2890 Ma South Swayze sandstone Age (Ma)

18 The Swayze transect Depositional timing of the North Swayze basin? 0 5 Kilometers Kilometers Foleyet Timber. Rd. Hwy 101 <2696 Ma <2688 Ma Kukatush porphyry Ma Sedimentary basin

19 The Swayze transect The importance of BIF Nat River complex Nat River BIF Kapuskasing structural zone Kenogammisi batholith Jefferson BIF Jasper Hill BIF Mallard BIF

20 The Swayze transect The importance of BIF >200 m depth Depositional rate = 1 cm/ year = m/myr Biologic Fe(II) oxidation Abiotic silica precipitation Fe 2+ Fe 3+ Fe(OH) 3 Si(OH) 4 Si rich layer Fe rich layer Si rich layer Fe rich layer Fe rich layer Fe rich layer Haugaard et al. 2013

21 The Swayze transect The importance of BIF

22 The Swayze transect The importance of BIF Nat River complex Nat River BIF Kapuskasing structural zone Kenogammisi batholith Woman River BIF Jasper Hill BIF Mallard BIF

23 The Swayze transect Msc project - The Woman River BIF 2735±5 Ma Blake et al., 2018

24 The Swayze transect The Woman River BIF Sphalerite, galena and chalcopyrite Best intersection: 7.27% Zn over 8.50m

25 The Swayze transect The Woman River BIF Hanging-wall N Mafic volcanic Argillite Tisdale? BIF Chlorite + sericite alteration Stockwork alteration Felsic volcanic Deloro Footwall

26 Future work 1. Further strengthen the stratigraphy (chronostratigraphy and chemostratigraphy of the volcanic rocks) 2. Improving the geological architecture such as important terrain boundaries can be determined 3. Implement the high-resolution seismic data, especially the R2 (<10 km depth) 4. Constraining the nature, provenance and, if possible, the depositional timing of the North Swayze basin Acknowledgements: Peter MacDonald (OGS); Charlie Mortimer; Pat Pope and Mary Stalker (GFG Resources); IAMGOLD