Constraints from cosmogenic nuclides on the glaciation and erosion history of Dove Bugt, northeast Greenland
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985530%3A_____%2F20%3A00531376" target="_blank" >RIV/67985530:_____/20:00531376 - isvavai.cz</a>
Result on the web
<a href="https://pubs.geoscienceworld.org/gsa/gsabulletin/article/132/11-12/2282/583151/Constraints-from-cosmogenic-nuclides-on-the" target="_blank" >https://pubs.geoscienceworld.org/gsa/gsabulletin/article/132/11-12/2282/583151/Constraints-from-cosmogenic-nuclides-on-the</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1130/B35410.1" target="_blank" >10.1130/B35410.1</a>
Alternative languages
Result language
angličtina
Original language name
Constraints from cosmogenic nuclides on the glaciation and erosion history of Dove Bugt, northeast Greenland
Original language description
The intricate interplay between subglacial topography and ice-sheet dynamics is key to the evolution of large ice sheets, but in Greenland as elsewhere the effects of long-term glacial history on landscape evolution remain poorly constrained. Here we measure abundances of cosmogenic Be-10 and Al-26 in bedrock and transported boulders to unveil the glaciation and erosion history of Dove Bugt, northeast Greenland. In agreement with studies of west Greenland, we find that apparent exposure ages increase with elevation from 9 ka to 13 ka in low-lying valleys to 21 ka to 204 ka on high-elevation, blockfield-covered plateaus. We employ a Markov chain Monte Carlo inversion framework to constrain the probability of various erosion histories, and we quantify the residence time of samples within the upper 2 m of the bedrock subsurface-a measure defined as the cosmogenic nuclide memory. This cosmogenic nuclide memory exceeds 600 ka on the highest plateaus but is limited to less than 500 ka in most other high-elevation samples and to less than 100 ka at low-elevations. Our results define maximum limits for the fraction of ice cover during the past 1 Ma to -70% on the Store Koldewey peaks and --90% farther inland at Pusterdal, respectively. Minimum limits to ice cover, however, cannot be reliably constrained by the data. Finally, we propose that limited erosion on the highest plateaus of Store Koldewey since 0.6-1.0 Ma indicates a minimum age for fjord-plateau formation within this area of northeast Greenland.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10505 - Geology
Result continuities
Project
—
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Geological Society of America Bulletin
ISSN
0016-7606
e-ISSN
—
Volume of the periodical
132
Issue of the periodical within the volume
11/12
Country of publishing house
US - UNITED STATES
Number of pages
13
Pages from-to
2282-2294
UT code for WoS article
000588959000004
EID of the result in the Scopus database
2-s2.0-85095608918