Iceland

Hannesdóttir, Sigrún Klara

doi:10.1515/9783111356679-010

Cited by 1 publication

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“…A seismic survey was conducted on Hestvatn in 1994 (Harðardóttir et al ., 2001a), and in 2005 a Reson Seabat 8101 multibeam sonar system was used to acquire a high‐resolution bathymetric survey of the lake (Hannesdóttir, 2006; Hannesdóttir et al ., 2009). DOSECC's GLAD200 core rig, equipped with ODP‐style coring tools, was used to recover 15–20‐m‐long cores at 60 m water depth from the two main depocenters within the lake (Fig.…”

Section: Methodsmentioning

confidence: 99%

Recurrent outburst floods and explosive volcanism during the Younger Dryas–Early Holocene deglaciation in south Iceland: evidence from a lacustrine record

Geirsdóttir

Miller

Harning

et al. 2021

J Quaternary Science

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Lake sediment records give valuable insight into the dynamic events that characterized the last deglaciation in Iceland. Here, we focus on the well‐dated sediment record from Hestvatn, a low‐elevation lake in south Iceland, that features six graded bedding events deposited by outburst floods from glacial lakes dammed by the decaying Iceland Ice Sheet (IIS) in the time period of the Vedde Ash and the G10ka Series tephra. Using climate proxies preserved in the sediment cores, in conjunction with regional glacial geomorphology, we reconstruct the retreat of the IIS in south Iceland, from a marine‐based glacier during the Younger Dryas to a land‐based glacier during the Preboreal. As the ice sheet margin withdrew to the central highlands, ice‐dammed lakes formed along glacier margins. The ice‐dams were occasionally breached, generating large‐scale jökulhlaups (catastrophic outburst floods) that deposited thick turbidite sequences preserved in the sediment record of Hestvatn. The high concentration of volcanic material incorporated within deglacial sediments indicates that along with IIS retreat, subglacial volcanic activity may have helped initiate some of the jökulhlaups. Onset of more stable Holocene conditions was reached after the final turbidite at ~10 ka bp, when the IIS had withdrawn from most of the highlands of Iceland.

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Section: Methodsmentioning

confidence: 99%