气候变化领域集成服务门户(CCPortal): Constraints from cosmogenic nuclides on the glaciation and erosion history of Dove Bugt, northeast Greenland

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DOI	10.1130/b35410.1
	Constraints from cosmogenic nuclides on the glaciation and erosion history of Dove Bugt, northeast Greenland
	Skov D.S.; Andersen J.L.; Olsen J.; Jacobsen B.H.; Knudsen M.F.; Jansen J.D.; Larsen N.K.; Egholm D.L.
发表日期	2020
ISSN	167606
起始页码	2282
结束页码	2294
卷号	132 期号:2021-11-12
英文摘要	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 longterm glacial history on landscape evolution remain poorly constrained. Here we measure abundances of cosmogenic 10Be and 26Al 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, blockfieldcovered 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. © 2020 © 2020
语种	英语
来源期刊	Bulletin of the Geological Society of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/184714
作者单位	Department of Geoscience, Aarhus University, Høegh-Guldbergs Gade 2, Aarhus C, 8000, Denmark; Department of Earth, Atmospheric and Planetary Sciences, Purdue University, 550 Stadium Mall Drive, West Lafayette, IN 47907, United States; Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, Aarhus C, 8000, Denmark; GFÚ Institute of Geophysics, Czech Academy of Sciences, Bočni II/1401, 141 31, Prague, Czechia, Czech Republic; Centre for GeoGenetics, Natural History Museum of Denmark, University of Copenhagen, Øster Voldgade 5-7, Copenhagen K, 1350, Denmark
推荐引用方式 GB/T 7714	Skov D.S.,Andersen J.L.,Olsen J.,et al. Constraints from cosmogenic nuclides on the glaciation and erosion history of Dove Bugt, northeast Greenland[J],2020,132(2021-11-12).
APA	Skov D.S..,Andersen J.L..,Olsen J..,Jacobsen B.H..,Knudsen M.F..,...&Egholm D.L..(2020).Constraints from cosmogenic nuclides on the glaciation and erosion history of Dove Bugt, northeast Greenland.Bulletin of the Geological Society of America,132(2021-11-12).
MLA	Skov D.S.,et al."Constraints from cosmogenic nuclides on the glaciation and erosion history of Dove Bugt, northeast Greenland".Bulletin of the Geological Society of America 132.2021-11-12(2020).