Canada Basin Revealed

Abstract

More than 15,000 line-km of new regional seismic reflection and refractiondata in the western Arctic Ocean provide insights into the tectonic andsedimentologic history of Canada Basin, permitting development of new geologicunderstanding in one of Earth's last frontiers. These new data support arotational opening model for southern Canada Basin. There is a central basementridge possibly representing an extinct spreading center with oceanic crustalvelocities and blocky basement morphology characteristic of spreading centrecrust surrounding this ridge. Basement elevation is lower in the south, mostlydue to sediment loading subsidence. The sedimentary succession is thickest inthe southern Beaufort Sea region, reaching more than 15 km, and generally thinsto the north and west. In the north, grabens and half-grabens are indicative ofextension. Alpha-Mendeleev Ridge is a large igneous province in northernAmerasia Basin, presumably emplaced synchronously with basin formation. Itoverprints most of northern Canada Basin structure. The seafloor andsedimentary succession of Canada Basin is remarkably flat-lying in its centralregion, with little bathymetric change over most of its extent. Reflectionsthat correlate over 100s of kms comprise most of the succession and on-lapbathymetric and basement highs. They are interpreted as representing depositsfrom unconfined turbidity current flows. Sediment distribution patterns reflectchanging source directions during the basin's history. Initially, probably lateCretaceous to Paleocene synrift sediments sourced from the Alaska andMackenzie-Beaufort margins. This unit shows a progressive series of onlapunconformities with a younging trend towards Alpha and Northwind ridges, likelya response to contemporaneous subsidence. Sediment source direction appeared toshift to the Canadian Arctic Archipelago margin for the Eocene and Oligocene, likely due to uplift of Arctic islands during the Eurekan Orogeny. The finalstage of sedimentation appears to be from the Mackenzie-Beaufort region for theMiocene and Pliocene when drainage patterns shifted in the Yukon and Alaska tothe Mackenzie valley. Upturned reflections at onlap positions may indicatesyn-depositional subsidence. There is little evidence, at least at a regionalseismic data scale, of contemporaneous or post-depositional sediment reworking, suggesting little large-scale geostrophic or thermohaline-driven bottom currentactivity.

Seismic velocities within the sedimentary succession of the Canada Basin and southern Alpha-Mendeleev Ridge, Arctic Ocean: evidence for accelerated porosity reduction?

“…The results shown on Fig. 11 correspond reasonably with earlier reconnaissance-scale maps (Grantz et al , 2011Jackson & Oakey 1990;Mosher et al 2012c) while representing a significant improvement in accuracy and level of detail. The most significant difference occurs beneath the slope off the Alaska margin where the present study indicates the succession is 2-3 km thicker than was mapped by Grantz et al (2011).…”

Rift systems of the Russian Eastern Arctic shelf and Arctic deep water basins: link between geological history and geodynamics

“…Новая версия карты, основанная на . Струк-тура Канадского бассейна показана с использованием данных в [Mosher et al, 2012;Chian et al, 2016].…”

“…In this paper, we do not consider the Canada Basin. New data on its structure are presented in [Mosher et al, 2012;Chian et al, 2016]. .…”

“…volume of seismic data is available concerning the structure of the Chukchi Plateau area [Arrigoni, 2008;Brumley, 2009Brumley, , 2014Grantz et al, 2011;Coakley, Ilhan, 2012;Mosher et al, 2012;Hegewald, Jokat, 2013].…”

“…1) [e.g., Laverov et al, 2013;Vernikovsky et al, 2013;Gaina et al, 2014;Pease et al, 2014;Nikishin et al, 2014;Petrov et al, 2016;Drachev, 2016]. Different versions of the stratigraphy of the ocean's sedimentary cover were presented in [Kim, Glezer, 2007;Backman et al, 2008;Bruvoll et al, 2010Bruvoll et al, , 2012Rekant, Gusev, 2012;Mosher et al, 2012;Døssing et al, 2013;Dobretsov et al, 2013;Weigelt et al, 2014;Jokat, Ickrath, 2015;Nikishin et al, 2014;Brumley, 2014;Rekant et al, 2015;Evangelatos, Mosher, 2016]. Large-scale seismic surveys were recently conducted on the shelves of the Laptev, East Siberian and Chukchi Seas, as well as in the deep-water part of the Arctic Ocean Rekant et al, 2015].…”