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The 1998 Ma Purtuniqophiolite: imbricated and metamorphosed oceanic crust in the Cape Smith Thrust Belt, northern Quebec

1989; Geological Association of Canada; Volume: 16; Issue: 3 Linguagem: Inglês

1911-4850

David J. Scott, M R St-Onge, S B Lucas, Herwart Helmstaedt,

Geochemistry and Geologic Mapping

A sequence of rocks representing obducted oceanic crust (an ophiolite) has been identified in the Cape Smith Belt. The physical and chemical nature of this 1998 Ma ophiolite is similar to rocks from Phanerozoic ophiolites and modern oceans, implying that tectonic processes similar to those operating today were active nearly two billion years ago. At that time, northern Quebec may have been tectonically similar to the modern Red Sea. Resume Une sequence de roches caracterisant une croute oceanique obductee (une ophiolite) a ete identifee dans la bande du Cap Smith. Les aspects physiques et chimiques decette ophiolite datee a 1998 Ma sont semblables a ceux des ophiolites phanerozoique et des oceans modernes. L'implication est queles processus tectoniques modernes sont semblables a ceux qui etaient actifs il y a deux milliards d'annees. A ce temps la, lenord du Quebec etait peutetre similaire a lamer Rouge actuelle.