Early to Mid Wisconsin fluvial deposits and palaeoenvironment of the Kidluit Formation, Tuktoyaktuk Coastlands, western Arctic Canada

Murton, Julian, Bateman, Mark D, Telka, Alice M, Waller, Richard, Whiteman, Colin and Kuzmina, Svetlana (2017) Early to Mid Wisconsin fluvial deposits and palaeoenvironment of the Kidluit Formation, Tuktoyaktuk Coastlands, western Arctic Canada. Permafrost and Periglacial Processes, 28 (3). pp. 523-533. ISSN 1045-6740

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Abstract

The Kidluit Formation (Fm) is a fluvial sand deposit that extends regionally across the Tuktoyaktuk Coastlands, western Arctic Canada. It was deposited by a large river flowing north into the Arctic Ocean prior to development of a cold-climate sandy desert and later glaciation by the Laurentide Ice Sheet. Lithostratigraphic and sedimentological field observations of the Summer Island area indicate deposition of the Kidluit Fm by a braided river system. Optical stimulated luminescence (OSL) dating of Kidluit sand provides eight OSL ages of 76–27 ka, which indicate deposition during Marine Isotope Stage (MIS) 4 and MIS 3. Radiocarbon dating of well-preserved weevil remains, a willow twig, wild raspberry seeds and bulrush achenes provides non-finite 14C ages of >52,200, >51,700, >45,900 and >54,700 14C BP and are assigned an age of either MIS 4 or early MIS 3. Plant macrofossils from the sand deposit indicate spruce forest conditions and climate slightly warmer than present, whereas insect fossils indicate tundra conditions slightly colder than present. The river system that deposited the Kidluit Fm was probably either a pre-Laurentide Mackenzie River or the palaeo-Porcupine River, or a combination of them.

Item Type: Article
Schools and Departments: School of Global Studies > Geography
Depositing User: Sharon Krummel
Date Deposited: 06 Apr 2017 12:05
Last Modified: 11 Sep 2017 05:25
URI: http://sro.sussex.ac.uk/id/eprint/67268

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