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- W40596636 abstract "The variation of major elements in approximately 850 samples of plutonic and volcanic rocks from the Superior Province in Manitoba is related to their tectonic setting in the English River, Uchi, Berens, and Sachigo provinces. The study distinguishes between an older (pre-Kenoran and early Kenoran) suite of tonalitic rocks spatially related to greenstone belt development, and a younger (Kenoran), unmetamorphosed suite of potassic rocks that characterizes large regions between volcanic belts. AFM, KNaCa, and QAbOr diagrams are utilized to demonstrate trondhjemitic (sodic) or calc-alkaline (potassic) differentiation trends for rock suites from the different subprovinces. Strong trondhjemitic (Na) differentiation trends are developed in most igneous rocks of the Uchi subprovince, in metaplutonic rocks of the Berens subprovince, and in plutonic and metaplutonic rocks of the Sachigo subprovince. Calc-alkaline trends are defined by volcanic and massive plutonic rocks of the Berens and Sachigo subprovinces. Metamorphic alteration is ruled out as a cause of Na-enrichment except in rocks of the English River subprovince. Supracrustal rocks of the northern portion of this subprovince are related to eugeosynclinal tectonics and the bulk of these rocks may have been the source rock from which both potassic and sodic magmas were derived during metamorphism. Within the tectonic setting of the western Superior Province, plutonic rocks, characterized by trondhjemitic trends, are seen as high temperature magma varieties related to a thicker ‘granitic’ crust overlying ‘basaltic’ crust. In general, the plutonic rocks of the western Superior Province display secular evolution from Na-rich tonalites and granodiorites to tonalites and granite." @default.
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- W40596636 date "1979-01-01" @default.
- W40596636 modified "2023-09-27" @default.
- W40596636 title "Petrochemistry and Tectonic Setting of Plutonic Rocks of the Superior Province in Manitoba" @default.
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- W40596636 doi "https://doi.org/10.1016/b978-0-444-41765-7.50015-0" @default.
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