气候变化领域集成服务门户(CCPortal): Oriented-lake development in the context of late Quaternary landscape evolution; McKinley Bay Coastal Plain; western Arctic Canada

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DOI	10.1016/j.quascirev.2020.106414
	Oriented-lake development in the context of late Quaternary landscape evolution; McKinley Bay Coastal Plain; western Arctic Canada
	Wolfe S.; Murton J.; Bateman M.; Barlow J.
发表日期	2020
ISSN	0277-3791
卷号	242
英文摘要	Oriented lakes—characterized by elongate forms, central basins and shallow littoral shelves—are common features of circum-arctic coastal lowlands. The environmental conditions, geological processes and chronology associated with the development of oriented lakes, however, are little known but essential for understanding how such Arctic lowlands evolve. Using combined techniques of field and drill-log stratigraphy and sedimentology, luminescence and radiocarbon dating methods and geomorphic mapping, we reconstruct the landscape evolution leading toward oriented-lake formation on the McKinley Bay Coastal Plain of western Arctic, Canada—a region with over 900 oriented lakes. Most lakes with deep central basins are inherited from a preglacial braidplain (ca. 73–27 ka) and alluvial braided-channel network that extended beyond the glacial limit (ca. 18.6–14.3 ka). Eolian erosion, active during the lateglacial and postglacial period (ca. 12.8–1.9 ka), reworked fluvial deposits. Eolian processes modified existing basins and created other shallow deflationary basins, as small barchanoid dunes migrated under cold, dry paraglacial conditions between about 12.8 and 10.7 ka. Vegetation cover developed at the onset of the early Holocene climatic optimum ca. 10.7 ka, and parabolic dunes were active between 9.6 and 4.6 ka. Thus, oriented lakes developed in basins conditioned by fluvial and eolian processes. In the absence of much near-surface ground ice, lateral expansion of deep-basin lakes and shallow stabilized deflationary basins predominated during the late Holocene through wind-induced wave and current processes. Overall, this sequence of oriented-lake formation does not support a thaw-lake cycle but, rather, small-basin evolution of a periglacial landscape. © 2020
英文关键词	Arctic North America; Eolian and fluvial; Geomorphology; Holocene; Late Pleistocene; Laurentide Ice Sheet; Optical dating; Oriented lakes; Paleogeography; Periglacial; Permafrost; Radiocarbon; Thermokarst
语种	英语
scopus关键词	Geomorphology; Glacial geology; Stratigraphy; Combined techniques; Environmental conditions; Geological process; Geomorphic mapping; Landscape evolutions; Lateral expansion; Radiocarbon dating; Wind induced waves; Lakes; environmental conditions; Holocene; lake dynamics; landscape evolution; littoral environment; lowland environment; Quaternary; radiocarbon dating; vegetation cover; Canada; Canada; McKinley Bay; Northwest Territories
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151392
作者单位	Geological Survey of Canada, Natural Resources Canada, Ottawa, ON K1A 0E8, Canada; Department of Geography, University of Sussex, Brighton, BN1 9RH, United Kingdom; Department of Geography, University of Sheffield, Sheffield, S1O 2TN, United Kingdom
推荐引用方式 GB/T 7714	Wolfe S.,Murton J.,Bateman M.,et al. Oriented-lake development in the context of late Quaternary landscape evolution; McKinley Bay Coastal Plain; western Arctic Canada[J],2020,242.
APA	Wolfe S.,Murton J.,Bateman M.,&Barlow J..(2020).Oriented-lake development in the context of late Quaternary landscape evolution; McKinley Bay Coastal Plain; western Arctic Canada.Quaternary Science Reviews,242.
MLA	Wolfe S.,et al."Oriented-lake development in the context of late Quaternary landscape evolution; McKinley Bay Coastal Plain; western Arctic Canada".Quaternary Science Reviews 242(2020).