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Geology Of The Biwabik Iron Formation And Duluth Complex

Geology Of The Biwabik Iron Formation And Duluth Complex

The Biwabik Iron Formation is a 1.9 billion year-old sequence of iron-rich sedimentary rocks that was metamorphosed at its eastern-most extent by 1.1 billion year-old intrusions of the Duluth Complex. The metamorphic recrystalliation of iron-formation locally produced iron-rich amphiboles and other fibrous iron-silicate minerals

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