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• W2000638247 abstract "Abstract The Vermilion greenstone belt, a nearly linear belt of steeply dipping, low grade, metavolcanic and metasedimentary rocks and adjacent areas in northeastern Minnesota compose a typical Archean (∼2.75 Ga) greenstone—granite association. In the western part of the belt, four formally designated units have been defined, which together form a complex volcanic—sedimentary pile that apparently formed through the coalescence of petrologically distinct volcanic centers. The oldest supracrustal unit, the lower Ely Greenstone, consists of calc-alkaline basalts, andesites, heterolithic agglomerates and tuffs deposited in a relatively shallow subaqueous environment. The lower part of this unit apparently was destroyed by emplacement of a granitic batholith. Following a period of volcanic quiescence, during which the Soudan Iron Formation and associated rocks were deposited, basaltic (tholeiitic) volcanism commenced and produced a subaqueous shield volcano (upper Ely Greenstone); the basalt interfingered laterally with calc-alkaline, dominantly dacitic material. The termination of basaltic volcanism was followed by a period of eruption of largely dacitic volcanic material accompanied by rapid erosion and turbidite deposition represented by the Lake Vermilion Formation and Knife Lake Group. This period was followed by renewed volcanism that changed laterally from dominantly calc-alkaline lava, tuff and breccia (felsic member of Newton Lake Formation) to dominantly basaltic lava and mafic—ultramafic intrusions (mafic member of Newton Lake Formation). Within the mafic sequence five petrologically distinct basalt types were erupted. Assuming that the present erosion surface in the Vermilion greenstone belt is a representative cross-section of the original supracrustal sequence, the volume of calc-alkaline, dacitic volcanic material appears to exceed that of basaltic volcanic rocks. If current petrologic models proposed for these rocks are valid, a dynamic tectonic environment capable of generating and rapidly recycling large volumes of volcanic and derived sedimentary material is required to account for the development of the Vermilion greenstone belt." @default.
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• W2000638247 date "1980-08-01" @default.
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• W2000638247 title "The magmatic evolution of the Vermilion greenstone belt, NE Minnesota" @default.
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• W2000638247 doi "https://doi.org/10.1016/0301-9268(80)90066-2" @default.
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