Abstract

Samples from the Upper Ordovician graywacke-shale sequence in western Notre Dame Bay, Newfoundland, contain trace quantities of detrital chromite. The age and provenance of these sedimentary rocks indicate that the chromite was derived from the general area of the ophiolite bodies now exposed in western Newfoundland. These data place a new constraint on tectonic reconstructions of the area for the Ordovician Period. Our analysis of the stratigraphy in Notre Dame Bay, together with recently published isotopic dates for both the Eastern Fleur de Lys terrane and Notre Dame Bay area is compatible with the hypothesis that ophiolite obduction in western Newfoundland resulted from the collision of an island arc with a passive continental margin during Middle Ordovician time.

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