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Petrogenesis of Archean (2.7 Ga) Mafic Volcanic Assemblages Near Ely, MN
The Vermilion District in northeastern Minnesota contains one of the classic Neoarchean Archean granite-greenstone belt terranes in the United States that formed between 2722 Ma to ~2661 Ma. Crustal development during ...
Comparing Paleoproterozoic Felsic Volcanic Centers Across Wisconsin : Implications for Tectonic History and Sulfide Mineralization
The rocks containing the Crandon deposit are part of the Pembine-Wausau Terrain and formed ~1.85 billion years ago. These formed in a bark-arc setting as part of the Penokean Orogeny. Arc-derived sediments eventually covered ...