Arctic-alpine blockfields in the northern Swedish Scandes : late Quaternary - not Neogene
Autochthonous blockfield mantles may indicate alpine surfaces that have not been glacially eroded. These surfaces may therefore serve as markers against which to determine Quaternary erosion volumes in adjacent glacially eroded sectors. To explore these potential utilities, chemical weathering featu...
Published in: | Earth Surface Dynamics |
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Language: | English |
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Stockholms universitet, Institutionen för naturgeografi och kvartärgeologi (INK)
2014
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Online Access: | http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-119273 https://doi.org/10.5194/esurf-2-383-2014 |
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ftstockholmuniv:oai:DiVA.org:su-119273 2023-05-15T15:13:40+02:00 Arctic-alpine blockfields in the northern Swedish Scandes : late Quaternary - not Neogene Goodfellow, Bradley W. Stroeven, Arjen P. Fabel, D. Fredin, O. Derron, M. -H. Bintanja, R. Caffee, M. W. 2014 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-119273 https://doi.org/10.5194/esurf-2-383-2014 eng eng Stockholms universitet, Institutionen för naturgeografi och kvartärgeologi (INK) Lund University, Sweden Earth Surface Dynamics, 2196-6311, 2014, 2:2, s. 383-401 orcid:0000-0002-2068-7490 orcid:0000-0001-8812-2253 http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-119273 doi:10.5194/esurf-2-383-2014 ISI:000356874100001 info:eu-repo/semantics/openAccess Earth and Related Environmental Sciences Geovetenskap och miljövetenskap Article in journal info:eu-repo/semantics/article text 2014 ftstockholmuniv https://doi.org/10.5194/esurf-2-383-2014 2023-02-23T21:41:31Z Autochthonous blockfield mantles may indicate alpine surfaces that have not been glacially eroded. These surfaces may therefore serve as markers against which to determine Quaternary erosion volumes in adjacent glacially eroded sectors. To explore these potential utilities, chemical weathering features, erosion rates, and regolith residence durations of mountain blockfields are investigated in the northern Swedish Scandes. This is done, firstly, by assessing the intensity of regolith chemical weathering along altitudinal transects descending from three blockfield-mantled summits. Clay / silt ratios, secondary mineral assemblages, and imaging of chemical etching of primary mineral grains in fine matrix are each used for this purpose. Secondly, erosion rates and regolith residence durations of two of the summits are inferred from concentrations of in situ-produced cosmogenic Be-10 and Al-26 in quartz at the blockfield surfaces. An interpretative model is adopted that includes temporal variations in nuclide production rates through surface burial by glacial ice and glacial isostasy-induced elevation changes of the blockfield surfaces. Together, our data indicate that these blockfields are not derived from remnants of intensely weathered Neogene weathering profiles, as is commonly considered. Evidence for this interpretation includes minor chemical weathering in each of the three examined blockfields, despite consistent variability according to slope position. In addition, average erosion rates of similar to 16.2 and similar to 6.7 mm ka(-1), calculated for the two blockfield-mantled summits, are low but of sufficient magnitude to remove present blockfield mantles, of up to a few metres in thickness, within a late Quaternary time frame. Hence, blockfield mantles appear to be replenished by regolith formation through, primarily physical, weathering processes that have operated during the Quaternary. The persistence of autochthonous blockfields over multiple glacial-interglacial cycles confirms their importance as key ... Article in Journal/Newspaper Arctic Stockholm University: Publications (DiVA) Arctic Earth Surface Dynamics 2 2 383 401 |
institution |
Open Polar |
collection |
Stockholm University: Publications (DiVA) |
op_collection_id |
ftstockholmuniv |
language |
English |
topic |
Earth and Related Environmental Sciences Geovetenskap och miljövetenskap |
spellingShingle |
Earth and Related Environmental Sciences Geovetenskap och miljövetenskap Goodfellow, Bradley W. Stroeven, Arjen P. Fabel, D. Fredin, O. Derron, M. -H. Bintanja, R. Caffee, M. W. Arctic-alpine blockfields in the northern Swedish Scandes : late Quaternary - not Neogene |
topic_facet |
Earth and Related Environmental Sciences Geovetenskap och miljövetenskap |
description |
Autochthonous blockfield mantles may indicate alpine surfaces that have not been glacially eroded. These surfaces may therefore serve as markers against which to determine Quaternary erosion volumes in adjacent glacially eroded sectors. To explore these potential utilities, chemical weathering features, erosion rates, and regolith residence durations of mountain blockfields are investigated in the northern Swedish Scandes. This is done, firstly, by assessing the intensity of regolith chemical weathering along altitudinal transects descending from three blockfield-mantled summits. Clay / silt ratios, secondary mineral assemblages, and imaging of chemical etching of primary mineral grains in fine matrix are each used for this purpose. Secondly, erosion rates and regolith residence durations of two of the summits are inferred from concentrations of in situ-produced cosmogenic Be-10 and Al-26 in quartz at the blockfield surfaces. An interpretative model is adopted that includes temporal variations in nuclide production rates through surface burial by glacial ice and glacial isostasy-induced elevation changes of the blockfield surfaces. Together, our data indicate that these blockfields are not derived from remnants of intensely weathered Neogene weathering profiles, as is commonly considered. Evidence for this interpretation includes minor chemical weathering in each of the three examined blockfields, despite consistent variability according to slope position. In addition, average erosion rates of similar to 16.2 and similar to 6.7 mm ka(-1), calculated for the two blockfield-mantled summits, are low but of sufficient magnitude to remove present blockfield mantles, of up to a few metres in thickness, within a late Quaternary time frame. Hence, blockfield mantles appear to be replenished by regolith formation through, primarily physical, weathering processes that have operated during the Quaternary. The persistence of autochthonous blockfields over multiple glacial-interglacial cycles confirms their importance as key ... |
format |
Article in Journal/Newspaper |
author |
Goodfellow, Bradley W. Stroeven, Arjen P. Fabel, D. Fredin, O. Derron, M. -H. Bintanja, R. Caffee, M. W. |
author_facet |
Goodfellow, Bradley W. Stroeven, Arjen P. Fabel, D. Fredin, O. Derron, M. -H. Bintanja, R. Caffee, M. W. |
author_sort |
Goodfellow, Bradley W. |
title |
Arctic-alpine blockfields in the northern Swedish Scandes : late Quaternary - not Neogene |
title_short |
Arctic-alpine blockfields in the northern Swedish Scandes : late Quaternary - not Neogene |
title_full |
Arctic-alpine blockfields in the northern Swedish Scandes : late Quaternary - not Neogene |
title_fullStr |
Arctic-alpine blockfields in the northern Swedish Scandes : late Quaternary - not Neogene |
title_full_unstemmed |
Arctic-alpine blockfields in the northern Swedish Scandes : late Quaternary - not Neogene |
title_sort |
arctic-alpine blockfields in the northern swedish scandes : late quaternary - not neogene |
publisher |
Stockholms universitet, Institutionen för naturgeografi och kvartärgeologi (INK) |
publishDate |
2014 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-119273 https://doi.org/10.5194/esurf-2-383-2014 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_relation |
Earth Surface Dynamics, 2196-6311, 2014, 2:2, s. 383-401 orcid:0000-0002-2068-7490 orcid:0000-0001-8812-2253 http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-119273 doi:10.5194/esurf-2-383-2014 ISI:000356874100001 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/esurf-2-383-2014 |
container_title |
Earth Surface Dynamics |
container_volume |
2 |
container_issue |
2 |
container_start_page |
383 |
op_container_end_page |
401 |
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1766344194775842816 |