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Supracrustal rocks of the eastern Great Bear magmatic zone unconformably lie upon rocks of the Hepburn metamorphic-plutonic zone over the entire length of the map area. Rocks of both zones are folded about northerly-trending axes in the region of the Wopmay fault zone. The northerly-trending folds form a central corridor in a regional sigmoidal pattern of folds and reflect local increased shear strain perhaps due to the occurrence of a buried suture. Metasedimentary rocks of the Grant Group lie unconformably on Archean gneisses. At the southern margin of the map area and in the adjoining sheet, the Grant Group and its probable Archean basement are tectonically repeated on a thrust fault. Plutonism within the Great Bear magmatic zone ranges both compositionally and temporally from more intermediate to more siliceous. Les roches supracrustales de la zone magmatique orientale de Great Bear reposent en discordance sur des roches de la zone mktamorpho-plutonique de Hepburn couvrant toute la longueur de la carte. Les deux groupes de roches sont plissks suivant des axes a direction nord duns la rkgion de la zone de failles de Wopmay. Les plis orientks au nord forment un 'corridor central duns une conjiguration sigmoidale rkgionale deplis et reflitent la contrainte accrue localementpar suite, probablement, de l'occurence d 'une ligne structurale principale., Les roches mtftaskdimentaires du groupe de Grant reposent en discordance sur des gneiss archkens. A la rnarge sud de la zone reprksentke par la carte ainsi que sur les feuilles contigub, le groupe de Grant ainsi que son soubassement probablement archLen se re'pktent tectoniquement sur une faille chevauchante. Le plutonisme qui r2gne ci l'intkrieur de la zone magmarique de Great Bear varie a la fois sur le plan de la composition et sur le plan temporel, allant d'un caract2re plus intermtfdiaire 2 plus siliceun. ' Department of Earth and Planetary Sciences, Washington University, St. Louis, MO, 66130, USA INTRODUCTION metres of sillimanite-garnet-biotite schist (Fig. 3). The secThis paper summarizes field work within the Calder River (86F) map area completed during the summer of 1987. The map area encompasses parts of three tectonic zones of Wopmay orogen, from east to west: Hepburn plutonicmetamorphic zone, Wopmay fault zone, and Great Bear magmatic zone. Work done previous to the current project within the area was of a reconnaissance nature and is listed in Hildebrand et al. (1987a).

Geology of parts of the Calder River map area, central Wopmay Orogen, District of Mackenzie