气候变化领域集成服务门户(CCPortal): Origin, burial and preservation of late Pleistocene-age glacier ice in Arctic permafrost (Bylot Island, NU, Canada)

CCPortal

DOI	10.5194/tc-13-97-2019
	Origin, burial and preservation of late Pleistocene-age glacier ice in Arctic permafrost (Bylot Island, NU, Canada)
	Coulombe S.; Fortier D.; Lacelle D.; Kanevskiy M.; Shur Y.
发表日期	2019
ISSN	19940416
EISSN	13
起始页码	97
结束页码	111
卷号	13 期号:1
英文摘要	Over the past decades, observations of buried glacier ice exposed in coastal bluffs and headwalls of retrogressive thaw slumps of the Arctic have indicated that considerable amounts of late Pleistocene glacier ice survived the deglaciation and are still preserved in permafrost. In exposures, relict glacier ice and intrasedimental ice often coexist and look alike but their genesis is strikingly different. This paper aims to present a detailed description and infer the origin of a massive ice body preserved in the permafrost of Bylot Island (Nunavut). The massive ice exposure and core samples were described according to the cryostratigraphic approach, combining the analysis of permafrost cryofacies and cryostructures, ice crystallography, stable O-H isotopes and cation contents. The ice was clear to whitish in appearance with large crystals (cm) and small gas inclusions (mm) at crystal intersections, similar to observations of englacial ice facies commonly found on contemporary glaciers and ice sheets. However, the δ 18 composition (-34.0±0.4%) of the massive ice was markedly lower than contemporary glacier ice and was consistent with the late Pleistocene age ice in the Barnes Ice Cap. This ice predates the aggradation of the surrounding permafrost and can be used as an archive to infer palaeo-environmental conditions at the study site. As most of the glaciated Arctic landscapes are still strongly determined by their glacial legacy, the melting of these large ice bodies could lead to extensive slope failures and settlement of the ground surface, with significant impact on permafrost geosystem landscape dynamics, terrestrial and aquatic ecosystems and infrastructure. © 2019 Author(s).
学科领域	aggradation; burial diagenesis; deglaciation; glacier dynamics; paleoenvironment; permafrost; Pleistocene; slope failure; Bylot Island; Canada; Nunavut; Nunavut
语种	英语
scopus关键词	aggradation; burial diagenesis; deglaciation; glacier dynamics; paleoenvironment; permafrost; Pleistocene; slope failure; Bylot Island; Canada; Nunavut; Nunavut
来源期刊	The Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/118950
作者单位	Polar Knowledge Canada, Cambridge Bay, X0B 0C0, Canada; Department of Geography, Université de Montréal, Montréal, H2V 2B8, Canada; Centre for Northern Studies, Université Laval, Quebec City, G1V 0A6, Canada; Department of Geography Environment and Geomatics, University of Ottawa, Ottawa, K1N 6N5, Canada; Institute of Northern Engineering, University of Alaska Fairbanks, Fairbanks, 99775-5910, United States; Department of Civil and Environmental Engineering, University of Alaska Fairbanks, Fairbanks, 99775-5960, United States
推荐引用方式 GB/T 7714	Coulombe S.,Fortier D.,Lacelle D.,et al. Origin, burial and preservation of late Pleistocene-age glacier ice in Arctic permafrost (Bylot Island, NU, Canada)[J],2019,13(1).
APA	Coulombe S.,Fortier D.,Lacelle D.,Kanevskiy M.,&Shur Y..(2019).Origin, burial and preservation of late Pleistocene-age glacier ice in Arctic permafrost (Bylot Island, NU, Canada).The Cryosphere,13(1).
MLA	Coulombe S.,et al."Origin, burial and preservation of late Pleistocene-age glacier ice in Arctic permafrost (Bylot Island, NU, Canada)".The Cryosphere 13.1(2019).