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Abstract

The Canadian Arctic transect corridor (Corridor G) extends across a wide range of geologic settings. In the south at Somerset Island, Archean crystalline rocks of the craton are exposed (Fig. 1). Northward across Cornwallis and Devon Islands the crystalline rocks are covered by Proterozoic and early Paleozoic platform deposits that were uplifted, eroded, and deformed in Silurian through Early Carboniferous time. Overlying these rocks between Devon and Ellef Ringnes Islands are late Paleozoic and Mesozoic strata of the Sverdrup Basin. These strata were locally deformed by evaporite diapirism and repeated episodes of mafic igneous intrusion and, east of Corridor G, were regionally deformed in latest Cretaceous and Paleogene time. Northwest of Ellef Ringnes Island the corridor traverses the latest Cretaceous and younger clastic terrace wedge that covers the continental margin of the Canada Basin. The corridor terminates at abyssal depths over the continental rise.

The corridor was selected to incorporate deep crustal seismic results between Cornwallis and northern Ellef Ringnes Islands (Sander and Overton, 1965; Hobson and Overton, 1967) and offshore refraction and reflection work along the east coast of Ellef Ringnes Island (Sobczak, 1982; Sobczak and Overton, 1984). Phanerozoic strata are almost completely represented along the corridor, and reflection seismic data (courtesy of Panarctic Oils Ltd., Calgary) locate stratigraphic horizons at several points. Borehole data are available for Cornwallis, Bathurst, Amund Ringnes, and Ellef Ringnes Islands, and there is regional coverage by gravity (Sobczak, 1978) and aeromagnetic (Coles and others, 1976) data, including detailed measurements in the Sverdrup Basin

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