State | Michigan |
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Name | Mafic metavolcanic rocks |
Geologic age | Early Proterozoic |
Lithologic constituents |
Major
Igneous > Volcanic > Mafic-volcanic > Basalt (Flow, Pyroclastic-tuff)Dominantly tholeiitic basalt and basaltic andesite flows and tuffs; associated with sheet dikes, massive and layered metagabbro, and ultramafic rocks. In northeastern Wisconsin, rocks have been named the Quinnesec Formation.
Igneous > Volcanic > Mafic-volcanic > Basaltic-andesite (Flow, Pyroclastic-tuff)Dominantly tholeiitic basalt and basaltic andesite flows and tuffs; associated with sheet dikes, massive and layered metagabbro, and ultramafic rocks. In northeastern Wisconsin, rocks have been named the Quinnesec Formation.
Minor
Igneous > Plutonic > Ultramafic (Flow)Dominantly tholeiitic basalt and basaltic andesite flows and tuffs; associated with sheet dikes, massive and layered metagabbro, and ultramafic rocks. In northeastern Wisconsin, rocks have been named the Quinnesec Formation.
Metamorphic > Metaigneous > Metaintrusive > MetagabbroDominantly tholeiitic basalt and basaltic andesite flows and tuffs; associated with sheet dikes, massive and layered metagabbro, and ultramafic rocks. In northeastern Wisconsin, rocks have been named the Quinnesec Formation.
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Comments | Pembine-Wausau terrane |
References | |
NGMDB product | |
Counties | Dickinson - Iron - Menominee |