Abstract
Seismic reflection data indicate that more than 14–16 km of clastic materials are preserved in the Beaufort-Mackenzie Basin. These correspond to tectonic activity and sediment loading from the Upper Cretaceous to the present day. To understand better how the basement movement responds to the thick sediment loading, an inverse flexural model has been used to simulate the evolutionary process. The results of the inverse flexural model simulation show that the basin subsidence developed dominantly as an elastic flexural response to sediment loading, with a minor component due to lateral compressive stress. The forward model results show that the Late Eocene to Pleistocene subsidence of the basin included three stages with different rates of subsidence. The Koponoar, Kugmallit and Iperk sequences represent products of two rapid subsidence stages, whereas the Mackenzie Bay and Akpak sequences reflect the products of a more stable and slower subsidence stage.
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