A 200 ka glaciation history from NW Svalbard

Forskningsoutput: KonferensbidragKonferensabstract

Abstract

Late Quaternary sedimentary units at Kongsfjordhallet, NW Svalbard, represent five cycles of glaciations and subsequent deglaciations during high relative sea levels. The high sea-level events are interpreted as glacioisostatically induced and imply preceding regional glaciations, which we constrain in time by luminescence and radiocarbon ages to just prior to ~195 ka, ~130 ka, ~85 ka, ~60 ka and ~14 ka. Combined with the stratigraphical record from nearby Leinstranda (Alexanderson et al. 2011) we identify six, possibly seven, major glacial advances during the last 200 ka in the Kongsfjorden region. Two of these occurred during the Saalian and at least four during the Weichselian.
The results are based on detailed sedimentological, stratigraphical and chronological investigations of the uppermost 15 m of the 40-m-high Kongsfjordhallet coastal sections. The succession is dominated by sediments of marine and littoral origin, representing partial shallowing-upward sequences due to isostatic rebound. Only one subglacial till was recognized. Interestingly, alluvial and periglacial deposits, not commonly recognized in this type of setting, occur in the sequence. These include weathered coarse alluvium, sandy channel fills as well as cryoturbated sediments and solifluction deposits. The sedimentary succession has been summarised in a facies model for an emergence cycle following deglaciation.
Our study encompasses only the upper 15 m of the coastal cliff sections at Kongsfjordhallet (succession A of Houmark-Nielsen and Funder 1999), and there is an additional ~20 m of sediments below our Unit 1, which is promising for future studies aiming to go further back in time.

Alexanderson, H., Landvik, J. Y. and Ryen, H. T. 2011. Chronology and styles of glaciation in an inter-fjord setting, northwestern Svalbard. Boreas 40, 175-197.
Houmark-Nielsen, M. and Funder, S. 1999. Pleistocene stratigraphy of Kongsfjordhallet, Spitsbergen, Svalbard. Polar Research 18, 39-49.

Detaljer

Författare
Enheter & grupper
Externa organisationer
  • Norwegian University of Life Sciences
  • Sveriges Geologiska Undersökning, SGU
  • Norwegian Water Resources and Energy Directorate
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Geologi
Originalspråkengelska
StatusPublished - 2018
PublikationskategoriForskning
Peer review utfördJa
Evenemang33rd Nordic Geological Winter Meeting - Lyngby, Danmark
Varaktighet: 2018 jan 102018 jan 12

Konferens

Konferens33rd Nordic Geological Winter Meeting
LandDanmark
OrtLyngby
Period2018/01/102018/01/12

Relaterad forskningsoutput

Helena Alexanderson, Henriksen, M., Ryen, H. T., Landvik, J. Y. & Peterson, G., 2018 feb 16, I : arktos. 4, 3, 25 s.

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

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Related projects

Helena Alexanderson

2007/04/01 → …

Projekt: ForskningInternationellt samarbete, Undervisning

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