Vedde Ash constrains Younger Dryas glacier re-advance and rapid glacio-isostatic rebound on Svalbard
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Vedde Ash constrains Younger Dryas glacier re-advance and rapid glacio-isostatic rebound on Svalbard. / Farnsworth, Wesley R.; Ingólfsson, Ólafur; Mannerfelt, Erik S.; Kalliokoski, Maarit H.; Guðmundsdóttir, Esther R.; Retelle, Michael; Allaart, Lis; Brynjólfsson, Skafti; Furze, Mark F. A.; Hancock, Holt J.; Kjær, Kurt H.; Pieńkowski, Anna J.; Schomacker, Anders.
In: Quaternary Science Advances, Vol. 5, 100041, 2022.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Vedde Ash constrains Younger Dryas glacier re-advance and rapid glacio-isostatic rebound on Svalbard
AU - Farnsworth, Wesley R.
AU - Ingólfsson, Ólafur
AU - Mannerfelt, Erik S.
AU - Kalliokoski, Maarit H.
AU - Guðmundsdóttir, Esther R.
AU - Retelle, Michael
AU - Allaart, Lis
AU - Brynjólfsson, Skafti
AU - Furze, Mark F. A.
AU - Hancock, Holt J.
AU - Kjær, Kurt H.
AU - Pieńkowski, Anna J.
AU - Schomacker, Anders
N1 - Publisher Copyright: © 2021 The Authors
PY - 2022
Y1 - 2022
N2 - 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 emergence 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 Heftyebreen moraine suggests Svalbard glacier dynamics during this period may have been more complex.
AB - 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 emergence 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 Heftyebreen moraine suggests Svalbard glacier dynamics during this period may have been more complex.
KW - Cryptotephra
KW - Glacio-isostatic adjustment
KW - Relative sea level
KW - Restrained rebound
U2 - 10.1016/j.qsa.2021.100041
DO - 10.1016/j.qsa.2021.100041
M3 - Journal article
AN - SCOPUS:85120681276
VL - 5
JO - Quaternary Science Advances
JF - Quaternary Science Advances
SN - 2666-0334
M1 - 100041
ER -
ID: 289960321