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- W1494294292 abstract "The Cape Smith Belt contains evidence for early Proterozoic plate tectonics in the form of a 1998 Ma ophiolite and a thrust belt which developed during northward under thrusting of a continental rift margin. Five tectonostratigraphic suites have been recognized from north to south in the eastern portion of the belt: (l) fluvio-deltaic sediments; (2) ca. 1960 Ma sediments and continental tholeiitic basalts; (3) ca. 1920 Ma transitional crust basalts; (4) deep-water sediments; and (5) basalts, sheeted dykes and mafic and ultra-mafic cumulates of a 1998 Ma ophiolite. Suites (1 ) to (3) reflect the development of a north-facing rift margin at the edge of the Superior Province. The older age of the ophiolite suggests that it developed in an earlier-rifted segment of the same basin, or it formed in a separate basin independent of the rift margin.ResumeLa presence, dans la bande du Cap Smith, d'une ophiolite datee a 1998 Ma et d'une ceinture de chevauchement resultant de la subduction vers le nord d'une marge de rift continental sont autant d'evidences pour ad-mettre l'existence d'une tectonique des plaques active pendant le Proterozoique inferieur. Cinq suites tectonostratigraphiques sont reconnues du nord au sud dans la par-tie est da la bande: (1) sediments fluvio-deltaiques; (2) sediments et basaltes tho-leiitiques continent aux {ca. 1960 Ma); (3) basaltes de croute transitionnelle (ca.1920 Ma); (4) sediments d'eau profonde; et (5) basaltes, dykes en feuillets et cumulats mafiques et ultramafiques d'une ophiolitedatee a 1998 Ma. Les suites (1) a (3) documentent l'ouverture progressive d'un rift d'abord continental puis oceanique sur labordure nord de la province du lac Supe-rieur. L'âge de l'ophiolite indique que ledomaine nord represente une portion plusa ncienne du bassin oceanique precite, ou un second bassin plus precose, developpe de maniere independante." @default.
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- W1494294292 date "1989-09-09" @default.
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- W1494294292 title "Evidence for the development of oceanic crust and for continental rifting in the tectonostratigraphy of the Early Proterozoic Cape Smith Belt" @default.
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