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A nearshore sediment sampling program was undertaken in Port au Port Bay, western Newfoundland. The -objectives of the program were to map the distribution of detrital chromite in the seabed sediments and to evaluate the paleoenvironmental evolution of chromite-bearing sedimentary facies. Bottom sediments were found to be enriched in detrital chromite in an area adjacent to and parallel to the east shore of the bay, south of the mouth of the Fox Island River. During glaciation, chromite from the Lewis Hills ophiolite complex was incorporated in glacial materials. Post-glacial reworking of chromite-bearing sediments by fluvial and marine processes is observed in a number of sedimentary facies: fluvial sediments of the Fox Island River, a large outwash plain and marine-limit delta occurring near the mouth of Fox Island River, an erosional lag blanketing the outwash delta, and emergent and submergent beach terraces bordering a small coastal embayment south of Fox Island River, The relatively low wave energy of the Port au Port Bay area appears, however, to have precluded extensive placer development in all sedimentary facies.  RESUME Un programme d'ehantillonage des sediments cotiers fut entrepris dans la baie de Port-au-Port, dans l'ouest de Terre-Neuve. Les buts de ce programme etaient de cartographier la distribution de la chromite detritique dans les sediments de fonds marin et d'evaluer l’evolution paleo-environnementale des facies sedimentaires porteurs de chromite. Les sediments de fond se sont reveles etre enrichis en chromite detriiique dans une zone adjacente et parallele a la cote est de la baie, au sud de l’embouchure de la riviere de file Fox. Pendant la glaciation, la chromite du complexe ophiolitique de Lewis Hills fut incorporee dans les materiaux glaciaires. Le remaniement post-glaciaire des sediments porteurs de chromite par des processus fluviaux et marins est observe dans un certain nombre de facies sedimentaires: les sediments fluviaux de la riviere de Tile Fox, unsandur etenductun delta de contact glaciaire situe pres de l'embouchure de la riviere de Tile Fox, un gravier residuel qui recouvre le sandur et des terrasses marines emergentes et submerges bordant une anse situee au sud de la riviere de l'ile Fox. L'energie relativement basse des vagues de la region de Port-au-Port semble toutefois avoir empeche la formation de placers etendus dans tous les facies sediment aires.  [Traduit par le journal]

Detrital chromite concentrations, nearshore Port au Port Bay, Newfoundland