Record ID

UAMc9f5d107c032491ab6d060c886a16776

Author

Wesley R. Farnsworth Wesley R. Farnsworth,, Undefined Affiliation

Ólafur Ingólfsson Ólafur Ingólfsson,, Undefined Affiliation

Erik S. Mannerfelt Erik S. Mannerfelt,, Undefined Affiliation

Maarit H. Kalliokoski Maarit H. Kalliokoski,, Undefined Affiliation

Esther R. Guðmundsdóttir Esther R. Guðmundsdóttir,, Undefined Affiliation

Michael Retelle Michael Retelle,, Undefined Affiliation

Lis Allaart Lis Allaart,, Undefined Affiliation

Skafti Brynjólfsson Skafti Brynjólfsson,, Undefined Affiliation

Mark F.A. Furze Mark F.A. Furze,, Undefined Affiliation

Holt J. Hancock Holt J. Hancock,, Undefined Affiliation

Kurt H. Kjær Kurt H. Kjær,, Undefined Affiliation

Anna Pieńkowski-Furze Anna Pieńkowski-Furze,, jednostki badawczo-dydaktyczne Wydziału Nauk Geograficznych i Geologicznych [nowa struktura organizacyjna] (SNP/WNGiG/JWNGiG)Szkoła Nauk Przyrodniczych [nowa struktura organizacyjna] (SNP)

Anders Schomacker Anders Schomacker,, Undefined Affiliation

et al.

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Journal series

Quaternary Science Advances, ISSN 2666-0334

Issue year

2022

Vol

5

Pages

1-11

Article number

100041

Keywords in original language

Cryptotephra, Glacio-isostatic adjustment, Restrained rebound, Relative sea level

Abstract in original language

The distal deposition of tephra from explosive volcanism has the potential to geochronologically constrain sedimentary archives and landforms. With this technique, we constrain a Late Glacial glacier re-advance on Svalbard and suggest that glacioisostatic emergence rates during the Younger Dryas chronozone were at least three times greater than previous estimates. The identification of cryptotephra (i.e., non-visible) horizons, outside the extent of visible fallout, has greatly expanded the field of application of tephrochronology. While the cryptotephra revolution has triggered a burst of investigations using low-concentration tephra to constrain distal sedimentary sequences, as of yet, few investigations have used this tool to constrain the age of glacial landforms. Here we constrain a moraine formed during a glacier re-advance (12.8–12.2 cal ka BP) into a high relative sea level during the early Younger Dryas chronozone, with the first identified occurrence of the Icelandic Vedde Ash on Svalbard. Low concentrations (~63 shards/g dried sediment) of the bimodal Vedde Ash (rhyolitic long axis c. 30–90 μm; basaltic c. 35–100 μm) were identified in a lake sediment sequence collected from the Heftyebreen glacier foreland, in a tributary valley to Grønfjorden, western Spitsbergen. Given that the cryptotephra was deposited within a lacustrine isolation basin, we further reconstruct a minimum rate of glacio-isostatic emer-gence during the end of the Late Glacial. Strong and longstanding evidence suggests Svalbard’s west-coast cirque glaciers were less extensive during the Late Glacial than the Late Holocene. However, the Late Glacial Hef-tyebreen moraine suggests Svalbard glacier dynamics during this period may have been more complex.

DOI

DOI:10.1016/j.qsa.2021.100041 Opening in a new tab

Language

eng (en) English

Score (nominal)

5

Score source

journalList

Score

Ministerial score = 5.0, 02-11-2021, ArticleFromJournal

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