Provenance of the Devonian Clastic Wedge of Arctic Canada: Evidence Provided by Detrital Zircon Ages
Vicki J. McNicoll, J. Chris Harrison, Hans P. Trettin, Ray Thorsteinsson, 1995. "Provenance of the Devonian Clastic Wedge of Arctic Canada: Evidence Provided by Detrital Zircon Ages", Stratigraphic Evolution of Foreland Basins, Steven L. Dorobek, Gerald M. Ross
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U-Pb geochronology data are presented for single detrital zircon grains from Eifelian, Givetian, and Frasnian sandstones of the Bird Fiord Formation of the central Arctic Islands, Hecla Bay, and Fram Formations of south central Ellesmere Island and the Okse Bay Formation of northern Ellesmere Island. The ranges of 207Pb/206Pb crystallization ages of the detrital zircons extracted from these sandstones are as follows: eight zircons between 2.62 and 3.0 Ga, four grains between 2.25 and 2.47 Ga, eleven zircons between 1.57 and 2.02 Ga, seven zircons between 1.04 and 1.20 Ga, and one grain of 0.43 Ga.
Potential source terrains include the Precambrian shield areas of Canada and Greenland and the mid-Paleozoic Caledonian-Franklinian orogen of Scandinavia, East and North Greenland, and the Canadian Arctic Islands. The East Greenland Caledonian orogen and its unroofed foreland molasse basin are the most probable primary source for the dated detrital zircons of the Devonian clastic wedge. The geology and geographic location of this region also satisfy other aspects of provenance including paleocurrent measurements, mineralogical and petrographic considerations, and the timing and magnitude of provenance area uplift.
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Stratigraphic Evolution of Foreland Basins - A strong case can be made that foreland basins are where the casual links between sedimentation and tectonic events were first recognized, as evidenced by the interpretations of geologists working in classic foreland areas. This Special Publication was derived from a Research Symposium entitled ?Stratigraphic Sequences in Foreland Basins ?held at the AAPG-SEPM joint annual meeting on June, 1992, in Calgary, Alberta, Canada. This volume provides a well-balanced perspective of current research on foreland basin stratigraphy and also serves as another element in the evolving framework that comprises our understanding of foreland basins. Given that so many of earth?s resources are found in foreland basins and that foreland basin strata often provide the only preserved record of the tectonic events that led to basin development, the impetus for continued studies of foreland basin strata should remain for many generations of geologists to come.