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Banded Iron
Age:
How It Formed:
Minerals Present:
- Age: 2.7bya
- How It Formed: Ex-halite that precipitated out into layers.
- Minerals Present: Jasper (Silica), Hematite
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Giant's Range Granite
Age:
How It Formed:
Minerals Present:
- Age: 2.7bya
- How It Formed: Formed in the Giants Range Batholith
- Minerals Present: Feldspar, Quartz, Amphibole
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Knife Lake Group
Age:
How It Formed:
Minerals Present:
- Age: 2.7bya
- How It Formed: Formed from above water sediments and felsic ash
- Minerals Present: Sedimentary rocks as well as meta-tuff and phyllites
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Duluth Complex
Age:
How It Formed:
Minerals Present:
- Age: 1.1bya
- How It Formed: Mafic sill that intruded between the Giants Range Batholith and the North Shore Volcanic Group
- Minerals Present: Contains mostly gabbro, contact zone contains precious metals (Copper)
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Archean Greenstone
Age:
How It Formed:
Minerals Present:
- Age: 2.7bya
- How It Formed: Formed from metamorphised basalt and chlorite
- Minerals Present: Contains greenstone and biotite schist (Quetico Sub-province)
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