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The AAPG/Datapages Combined Publications Database

CSPG Special Publications

Abstract


Canada's Continental Margins and Offshore Petroleum Exploration — Memoir 4, 1975
Pages 411-431
Baffin Bay Margins

Geophysical Results From the Continental Margin Off Southern Baffin Island

A. C. Grant

Abstract

Reflection seismic and magnetic data from the continental margin off southern Baffin Island indicate a much more complex structural style than is observed on the Labrador Shelf to the south. Several “geophysical units” can be identified on the southern Baffin Shelf on the basis of seismic and magnetic character. By analogy with geophysical observations in Hudson Strait-Ungava Bay and on the Labrador-Newfoundland Shelf to the south, these units are provisionally identified as being Precambrian, early Paleozoic, late Paleozoic-Mesozoic and Cretaceous-Tertiary in age. The inferred upper Paleozoic to Tertiary sedimentary units are affected by folding, faulting, diapir-like intrusions and, off Cape Dyer, are covered by patches of presumed Lower Tertiary basalt. The basalt patches offshore appear to be either faulted or erosional remnants of an originally more extensive cover. Buried erosional channels in the inferred Cretaceous-Tertiary section off Cumberland Sound exceed 1 km in depth, and may deepen considerably to the north in Davis Strait. Review of available survey data suggests that in the region of the Davis Strait sill, the sea floor may be underlain mainly by continental crust, which raises strong doubt regarding the hypothesis that Greenland underwent major separation from Canada during a Late Cretaceous-Early Tertiary episode of sea-floor spreading.


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