Radiocarbon ages, dose rates, water isotopic composition and hydrochemistry of samples from Komakuk Beach and Herschel Island ...

• Main Authors: Fritz, Michael, Wetterich, Sebastian, Schirrmeister, Lutz, Meyer, Hanno, Lantuit, Hugues, Preusser, Frank, Pollard, Wayne H
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2012
• Subjects: International Polar Year 2007-2008 IPY; Permafrost Research Periglacial Dynamics @ AWI AWI_PerDyn; Herschel; Herschel Island; Ice; Ice Sheet; International Polar Year; IPY; permafrost; Beringia; Yukon
• Online Access: https://dx.doi.org/10.1594/pangaea.809992; https://doi.pangaea.de/10.1594/PANGAEA.809992

Terrestrial permafrost archives along the Yukon Coastal Plain (northwest Canada) have recorded landscape development and environmental change since the Late Wisconsinan at the interface of unglaciated Beringia (i.e. Komakuk Beach) and the northwestern limit of the Laurentide Ice Sheet (i.e. Herschel Island). The objective of this paper is to compare the late glacial and Holocene landscape development on both sides of the former ice margin based on permafrost sequences and ground ice. Analyses at these sites involved a multi-proxy approach including: sedimentology, cryostratigraphy, palaeoecology of ostracods, stable water isotopes in ground ice, hydrochemistry, and AMS radiocarbon and infrared stimulated luminescence (IRSL) dating. AMS and IRSL age determinations yielded full glacial ages at Komakuk Beach that is the northeastern limit of ice-free Beringia. Herschel Island to the east marks the Late Wisconsinan limit of the northwest Laurentide Ice Sheet and is composed of ice-thrust sediments containing ... : Data extracted in the frame of a joint ICSTI/PANGAEA IPY effort, see http://doi.pangaea.de/10.1594/PANGAEA.150150 ...