| NÝVLT, Daniel, Regis BRAUCHER, Zbyněk ENGEL a Bedřich MLČOCH. Timing of the Northern Prince Gustav Ice Stream retreat and the deglaciation of northern James Ross Island, Antarctic Peninsula during the last glacial-interglacial transition. Quaternary Research. 2014, roč. 82, č. 2, s. 441-449. ISSN 0033-5894. doi:10.1016/j.yqres.2014.05.003. |
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@article{1214489,
author = {Nývlt, Daniel and Braucher, Regis and Engel, Zbyněk and Mlčoch, Bedřich},
article_number = {2},
doi = {http://dx.doi.org/10.1016/j.yqres.2014.05.003},
keywords = {Northern Prince Gustav Ice Stream; Antarctic Peninsula Ice Sheet; Be-10 exposure dating; Schmidt hammer testing; Pleistocene-Holocene transition; James Ross Island},
language = {eng},
issn = {0033-5894},
journal = {Quaternary Research},
title = {Timing of the Northern Prince Gustav Ice Stream retreat and the deglaciation of northern James Ross Island, Antarctic Peninsula during the last glacial-interglacial transition},
volume = {82},
year = {2014}
}
TY - JOUR
ID - 1214489
AU - Nývlt, Daniel - Braucher, Regis - Engel, Zbyněk - Mlčoch, Bedřich
PY - 2014
TI - Timing of the Northern Prince Gustav Ice Stream retreat and the deglaciation of northern James Ross Island, Antarctic Peninsula during the last glacial-interglacial transition
JF - Quaternary Research
VL - 82
IS - 2
SP - 441-449
EP - 441-449
SN - 00335894
KW - Northern Prince Gustav Ice Stream
KW - Antarctic Peninsula Ice Sheet
KW - Be-10 exposure dating
KW - Schmidt hammer testing
KW - Pleistocene-Holocene transition
KW - James Ross Island
N2 - The Northern Prince Gustav Ice Stream located in Prince Gustav Channel, drained the northeastern portion of the Antarctic Peninsula Ice Sheet during the last glacial maximum. Here we present a chronology of its retreat based on in situ produced cosmogenic Be-10 from erratic boulders at Cape Lachman, northern James Ross Island. Schmidt hammer testing was adopted to assess the weathering state of erratic boulders in order to better interpret excess cosmogenic Be-10 from cumulative periods of pre-exposure or earlier release from the glacier. The weighted mean exposure age of five boulders based on Schmidt hammer data is 12.9 +/- 1.2 ka representing the beginning of the deglaciation of lower-lying areas (<60 m a.s.l.) of the northern James Ross Island, when Northern Prince Gustav Ice Stream split from the remaining James Ross Island ice cover. This age represents the minimum age of the transition from grounded ice stream to floating ice shelf in the middle continental shelf areas of the northern Prince Gustav Channel. The remaining ice cover located at higher elevations of northern James Ross Island retreated during the early Holocene due to gradual decay of terrestrial ice and increase of equilibrium line altitude. Schmidt hammer R-values are inversely correlated with Be-10 exposure ages and could be used as a proxy for exposure history of individual granite boulders in this region and favour the hypothesis of earlier release of boulders with excessive Be-10 concentrations from glacier directly at this site. These data provide evidences for an earlier deglaciation of northern James Ross Island when compared with other recently presented cosmogenic nuclide based deglaciation chronologies, but this timing coincides with rapid increase of atmospheric temperature in this marginal part of Antarctica.
ER -
NÝVLT, Daniel, Regis BRAUCHER, Zbyněk ENGEL a Bedřich MLČOCH. Timing of the Northern Prince Gustav Ice Stream retreat and the deglaciation of northern James Ross Island, Antarctic Peninsula during the last glacial-interglacial transition. \textit{Quaternary Research}. 2014, roč.~82, č.~2, s.~441-449. ISSN~0033-5894. doi:10.1016/j.yqres.2014.05.003.
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