Directly dating postglacial Greenlandic land-surface emergence at high resolution using in situ 10 Be
Abstract Postglacial emergence curves are used to infer mantle rheology, delimit ice extent, and test models of the solid Earth response to changing ice and water loads. Such curves are rarely produced by direct dating of land emergence; rather, most rely on the presence of radiocarbon-datable organ...
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Online Access: | http://dx.doi.org/10.1017/qua.2018.6 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589418000066 |
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crcambridgeupr:10.1017/qua.2018.6 2024-06-23T07:53:17+00:00 Directly dating postglacial Greenlandic land-surface emergence at high resolution using in situ 10 Be Bierman, Paul R. Rood, Dylan H. Shakun, Jeremy D. Portenga, Eric W. Corbett, Lee B. 2018 http://dx.doi.org/10.1017/qua.2018.6 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589418000066 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Quaternary Research volume 90, issue 1, page 110-126 ISSN 0033-5894 1096-0287 journal-article 2018 crcambridgeupr https://doi.org/10.1017/qua.2018.6 2024-06-05T04:03:45Z Abstract Postglacial emergence curves are used to infer mantle rheology, delimit ice extent, and test models of the solid Earth response to changing ice and water loads. Such curves are rarely produced by direct dating of land emergence; rather, most rely on the presence of radiocarbon-datable organic material and inferences made between the age of sedimentary deposits and landforms indicative of former sea level. Here, we demonstrate a new approach, 10 Be dating, to determine rates of postglacial land emergence in two different settings. In southern Greenland (Narsarsuaq/Igaliku), we date directly the exposure, as relative sea level fell, of gravel beaches and rocky outcrops allowing determination of rapid, post–Younger Dryas emergence. In western Greenland (Kangerlussuaq), we constrain Holocene isostatic response by dating the sequential stripping of terrace sediment driven by land-surface uplift, relative sea-level fall, and resulting fluvial incision. The technique we employ provides high temporal and elevation resolution important for quantifying rapid emergence immediately after deglaciation and less rapid uplift during the middle Holocene. 10 Be-constrained emergence curves can improve knowledge of relative sea-level change by dating land emergence along rocky coasts, at elevations and locations where radiocarbon-datable sediments are not present, and without the lag time needed for organic material to accumulate. Article in Journal/Newspaper Greenland greenlandic Igaliku Kangerlussuaq Narsarsuaq Cambridge University Press Greenland Igaliku ENVELOPE(-45.421,-45.421,60.988,60.988) Kangerlussuaq ENVELOPE(-55.633,-55.633,72.633,72.633) Quaternary Research 90 1 110 126 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
Abstract Postglacial emergence curves are used to infer mantle rheology, delimit ice extent, and test models of the solid Earth response to changing ice and water loads. Such curves are rarely produced by direct dating of land emergence; rather, most rely on the presence of radiocarbon-datable organic material and inferences made between the age of sedimentary deposits and landforms indicative of former sea level. Here, we demonstrate a new approach, 10 Be dating, to determine rates of postglacial land emergence in two different settings. In southern Greenland (Narsarsuaq/Igaliku), we date directly the exposure, as relative sea level fell, of gravel beaches and rocky outcrops allowing determination of rapid, post–Younger Dryas emergence. In western Greenland (Kangerlussuaq), we constrain Holocene isostatic response by dating the sequential stripping of terrace sediment driven by land-surface uplift, relative sea-level fall, and resulting fluvial incision. The technique we employ provides high temporal and elevation resolution important for quantifying rapid emergence immediately after deglaciation and less rapid uplift during the middle Holocene. 10 Be-constrained emergence curves can improve knowledge of relative sea-level change by dating land emergence along rocky coasts, at elevations and locations where radiocarbon-datable sediments are not present, and without the lag time needed for organic material to accumulate. |
format |
Article in Journal/Newspaper |
author |
Bierman, Paul R. Rood, Dylan H. Shakun, Jeremy D. Portenga, Eric W. Corbett, Lee B. |
spellingShingle |
Bierman, Paul R. Rood, Dylan H. Shakun, Jeremy D. Portenga, Eric W. Corbett, Lee B. Directly dating postglacial Greenlandic land-surface emergence at high resolution using in situ 10 Be |
author_facet |
Bierman, Paul R. Rood, Dylan H. Shakun, Jeremy D. Portenga, Eric W. Corbett, Lee B. |
author_sort |
Bierman, Paul R. |
title |
Directly dating postglacial Greenlandic land-surface emergence at high resolution using in situ 10 Be |
title_short |
Directly dating postglacial Greenlandic land-surface emergence at high resolution using in situ 10 Be |
title_full |
Directly dating postglacial Greenlandic land-surface emergence at high resolution using in situ 10 Be |
title_fullStr |
Directly dating postglacial Greenlandic land-surface emergence at high resolution using in situ 10 Be |
title_full_unstemmed |
Directly dating postglacial Greenlandic land-surface emergence at high resolution using in situ 10 Be |
title_sort |
directly dating postglacial greenlandic land-surface emergence at high resolution using in situ 10 be |
publisher |
Cambridge University Press (CUP) |
publishDate |
2018 |
url |
http://dx.doi.org/10.1017/qua.2018.6 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589418000066 |
long_lat |
ENVELOPE(-45.421,-45.421,60.988,60.988) ENVELOPE(-55.633,-55.633,72.633,72.633) |
geographic |
Greenland Igaliku Kangerlussuaq |
geographic_facet |
Greenland Igaliku Kangerlussuaq |
genre |
Greenland greenlandic Igaliku Kangerlussuaq Narsarsuaq |
genre_facet |
Greenland greenlandic Igaliku Kangerlussuaq Narsarsuaq |
op_source |
Quaternary Research volume 90, issue 1, page 110-126 ISSN 0033-5894 1096-0287 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/qua.2018.6 |
container_title |
Quaternary Research |
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90 |
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1 |
container_start_page |
110 |
op_container_end_page |
126 |
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1802644864273219584 |