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Cosmogenic 10Be exposure dating of glacial erratics on Horseshoe Island in western Antarctic Peninsula confirms rapid deglaciation in the Early Holocene

Cosmogenic 10Be exposure dating of glacial erratics on Horseshoe Island in western Antarctic... AbstractThe rapid warming observed in the western Antarctic Peninsula gives rise to a fast disintegration of ice shelves and thinning and retreat of marine-terminating continental glaciers, which is likely to raise global sea levels in the near future. In order to understand the contemporary changes in context and to provide constraints for hindcasting models, it is important to understand the Late Quaternary history of the region. Here, we build on previous work on the deglacial history of the western Antarctic Peninsula and we present four new cosmogenic 10Be exposure ages from Horseshoe Island in Marguerite Bay, which has been suggested as a former location of very fast ice stream retreat. Four samples collected from erratic pink granite boulders at an altitude of ~80 m above sea level yielded ages that range between 12.9 ± 1.1 ka and 9.4 ± 0.8 ka. As in other studies on Antarctic erratics, we have chosen to report the youngest erratic age (9.4 ± 0.8 ka) as the true age of deglaciation, which confirms a rapid thinning of the Marguerite Trough Ice Stream at the onset of Holocene. This result is consistent with other cosmogenic age data and other proxies (marine and lacustrine 14C and optically stimulated luminescence) reported from nearby areas. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Antarctic Science Cambridge University Press

Cosmogenic 10Be exposure dating of glacial erratics on Horseshoe Island in western Antarctic Peninsula confirms rapid deglaciation in the Early Holocene

Antarctic Science , Volume 31 (6): 13 – Dec 1, 2019
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Publisher
Cambridge University Press
Copyright
Copyright © Antarctic Science Ltd 2019 
ISSN
0954-1020
eISSN
1365-2079
DOI
10.1017/S0954102019000439
Publisher site
See Article on Publisher Site

Abstract

AbstractThe rapid warming observed in the western Antarctic Peninsula gives rise to a fast disintegration of ice shelves and thinning and retreat of marine-terminating continental glaciers, which is likely to raise global sea levels in the near future. In order to understand the contemporary changes in context and to provide constraints for hindcasting models, it is important to understand the Late Quaternary history of the region. Here, we build on previous work on the deglacial history of the western Antarctic Peninsula and we present four new cosmogenic 10Be exposure ages from Horseshoe Island in Marguerite Bay, which has been suggested as a former location of very fast ice stream retreat. Four samples collected from erratic pink granite boulders at an altitude of ~80 m above sea level yielded ages that range between 12.9 ± 1.1 ka and 9.4 ± 0.8 ka. As in other studies on Antarctic erratics, we have chosen to report the youngest erratic age (9.4 ± 0.8 ka) as the true age of deglaciation, which confirms a rapid thinning of the Marguerite Trough Ice Stream at the onset of Holocene. This result is consistent with other cosmogenic age data and other proxies (marine and lacustrine 14C and optically stimulated luminescence) reported from nearby areas.

Journal

Antarctic Science – Cambridge University Press

Published: Dec 1, 2019

Keywords: cosmogenic surface dating; ice sheet; Marguerite Bay; palaeoclimate

References

  • A record of Holocene glacial and oceanographic variability in Neny Fjord, Antarctic Peninsula
  • Widespread biological response to rapid warming on the Antarctic Peninsula
  • Geomorphology of the onset area of a palaeo-ice stream, Marguerite Bay, Antarctica Peninsula
  • Improved moraine age interpretations through explicit matching of geomorphic process models to cosmogenic nuclide measurements from single landforms
  • Features of the glacial history of the Transantarctic Mountains inferred from cosmogenic 26Al, 10Be and 21Ne concentrations in bedrock surfaces
  • Geomorphological evidence and cosmogenic Be-10/Al-26 exposure ages for the Last Glacial Maximum and deglaciation of the Antarctic Peninsula ice sheet
  • Relative sea level curves for the South Shetland Islands and Marguerite Bay, Antarctic Peninsula
  • Mechanisms of Holocene palaeoenvironmental change in the Antarctic Peninsula region
  • Early Holocene retreat of George VI Ice Shelf, Antarctic Peninsula
  • Rapid deglaciation of Marguerite Bay, western Antarctic Peninsula in the Early Holocene
  • Geological calibration of spallation production rates in the CRONUS-Earth project
  • Geomorphic and shallow-acoustic investigation of an Antarctic Peninsula fjord system using high-resolution ROV and shipboard geophysical observations: Ice dynamics and behaviour since the Last Glacial Maximum
  • Glaciology and geological signature of the Last Glacial Maximum Antarctic ice sheet
  • Schmidt Hammer studies in the maritime Antarctic: application to dating Holocene deglaciation and estimating the effects of macrolichens on rock weathering
  • Radiocarbon constraints on Antarctic Peninsula ice sheet retreat following the Last Glacial Maximum
  • Too young or too old: evaluating cosmogenic exposure dating based on an analysis of compiled boulder exposure ages
  • Exploring former subglacial Hodgson Lake, Antarctica Paper I: site description, geomorphology and limnology
  • Late Quaternary environmental changes in Marguerite Bay, Antarctic Peninsula, inferred from lake sediments and raised beaches
  • The deglacial history of NW Alexander Island, Antarctica, from surface exposure dating
  • Ice–stream retreat and ice-shelf history in Marguerite Trough, Antarctic Peninsula: sedimentological and foraminiferal signatures
  • Scaling in situ cosmogenic nuclide production rates using analytical approximations to atmospheric cosmic-ray fluxes
  • Glacial geomorphology of Marguerite Bay Palaeo-Ice stream, western Antarctic Peninsula
  • Antarctic palaeo-ice streams
  • Cosmogenic nuclide systematics and the CRONUScalc program
  • The geology of Horseshoe and Lagotellerie islands, Marguerite Bay, Graham Land
  • Reconstruction of ice-sheet changes in the Antarctic Peninsula since the Last Glacial Maximum
  • Geological constraints on Antarctic palaeo-ice stream retreat
  • Coupling patterns between para-glacial and permafrost degradation responses in Antarctica
  • Recent regional climate cooling on the Antarctic Peninsula and associated impacts on the cryosphere
  • Accuracy of cosmogenic ages for moraines
  • Holocene relative sea-level change and deglaciation on Alexander Island, Antarctic Peninsula, from elevated lake deltas
  • Patterns of spatiotemporal paraglacial response in the Antarctic Peninsula region and associated ecological implications
  • Evaluating the life expectancy of a desert pavement
  • Rate of late Quaternary ice cap thinning on King George Island, South Shetland Islands, West Antarctica defined by cosmogenic 36Cl surface exposure dating
  • Mass balance of the Antarctic ice sheet from 1992 to 2017
  • Relative sea-level history of Marguerite Bay, Antarctic Peninsula derived from optically stimulated luminescence-dated beach cobbles
  • Antarctic ice sheet palaeo-thinning rates from vertical transects of cosmogenic exposure ages
  • Oceanic and atmospheric forcing of early Holocene ice shelf retreat, George VI Ice Shelf, Antarctica Peninsula
  • Air pressure and cosmogenic isotope production
  • Holocene deglaciation of Marie Byrd Land, West Antarctica
  • Absence of 21st century warming on Antarctic Peninsula consistent with natural variability
  • Recent rapid regional climate warming on the Antarctic Peninsula
  • Diatom stratigraphy in a lake on Horseshoe Island, Antarctica: a marine-brackish-fresh water transition with comments on the systematics and ecology of the most common diatoms
  • Geomorphological map of Horseshoe Island, Marguerite Bay, Antarctica