Riverine silicon isotope variations in glaciated basaltic terrains: implications for the Si delivery to the ocean over glacial-interglacial intervals
Marine primary production is dominated by diatoms and these are dependent upon the riverine delivery of silicon (Si) to the ocean. In paleoreconstruction of silicic acid utilisation by diatoms, it is assumed that the isotopic composition of the Si that is delivered from the continent to the oceans r...
Published in: | Earth and Planetary Science Letters |
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2013
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ftvliz:oai:oma.vliz.be:238273 2023-05-15T18:25:47+02:00 Riverine silicon isotope variations in glaciated basaltic terrains: implications for the Si delivery to the ocean over glacial-interglacial intervals Opfergelt, S. Burton, K.W. Pogge von Strandmann, P.A.E. Gislason, S.R. Halliday, A.N. 2013 http://www.vliz.be/nl/open-marien-archief?module=ref&refid=238273 en eng info:eu-repo/semantics/altIdentifier/wos/000320684500021 info:eu-repo/semantics/altIdentifier/doi/doi.org/10.1016/j.epsl.2013.03.025 http://www.vliz.be/nl/open-marien-archief?module=ref&refid=238273 info:eu-repo/semantics/restrictedAccess %3Ci%3EEarth+Planet.+Sci.+Lett.+369-370%3C%2Fi%3E%3A+211-219.+%3Ca+href%3D%22https%3A%2F%2Fdx.doi.org%2F10.1016%2Fj.epsl.2013.03.025%22+target%3D%22_blank%22%3Ehttps%3A%2F%2Fdx.doi.org%2F10.1016%2Fj.epsl.2013.03.025%3C%2Fa%3E info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2013 ftvliz https://doi.org/10.1016/j.epsl.2013.03.025 2022-05-01T10:15:10Z Marine primary production is dominated by diatoms and these are dependent upon the riverine delivery of silicon (Si) to the ocean. In paleoreconstruction of silicic acid utilisation by diatoms, it is assumed that the isotopic composition of the Si that is delivered from the continent to the oceans remains constant. In this study it is shown that glacier-fed Icelandic rivers differ from those directly draining basaltic catchments in their dissolved Si isotope compositions. Lighter values (d 30 Si=+0.17±0.18‰) are associated with the high physical erosion rates in glacial rivers, and heavier values (d 30 Si=+0.97±0.31‰) are associated with lower physical erosion rates and enhanced formation of secondary minerals in direct runoff rivers. The Si isotopic compositions correlate with those of Li and provide evidence of a climatic dependence that is likely to have led to glacial–interglacial differences. Based on existing d 30 Si measurements from diatoms in a sediment record from the Southern Ocean, the interpretation of changes in Si utilisation between the Last Glacial Maximum (LGM) and the early Holocene is revisited taking into account changing isotopic compositions of the river water delivered to the ocean over glacial–interglacial intervals. During the LGM, Si utilisation values are higher when allowing for changing Si isotope input to the ocean (59±5%), than when a constant Si isotope input is assumed (42–47±5%). This reduces but does not eliminate the difference relative to the Holocene (88±5%). Therefore, changes in Si isotope delivery to the ocean need to be taken into account in the precise reconstruction of ocean Si utilisation and primary productivity over glacial–interglacial timescales. Article in Journal/Newspaper Southern Ocean Flanders Marine Institute (VLIZ): Open Marine Archive (OMA) Southern Ocean Earth and Planetary Science Letters 369-370 211 219 |
institution |
Open Polar |
collection |
Flanders Marine Institute (VLIZ): Open Marine Archive (OMA) |
op_collection_id |
ftvliz |
language |
English |
description |
Marine primary production is dominated by diatoms and these are dependent upon the riverine delivery of silicon (Si) to the ocean. In paleoreconstruction of silicic acid utilisation by diatoms, it is assumed that the isotopic composition of the Si that is delivered from the continent to the oceans remains constant. In this study it is shown that glacier-fed Icelandic rivers differ from those directly draining basaltic catchments in their dissolved Si isotope compositions. Lighter values (d 30 Si=+0.17±0.18‰) are associated with the high physical erosion rates in glacial rivers, and heavier values (d 30 Si=+0.97±0.31‰) are associated with lower physical erosion rates and enhanced formation of secondary minerals in direct runoff rivers. The Si isotopic compositions correlate with those of Li and provide evidence of a climatic dependence that is likely to have led to glacial–interglacial differences. Based on existing d 30 Si measurements from diatoms in a sediment record from the Southern Ocean, the interpretation of changes in Si utilisation between the Last Glacial Maximum (LGM) and the early Holocene is revisited taking into account changing isotopic compositions of the river water delivered to the ocean over glacial–interglacial intervals. During the LGM, Si utilisation values are higher when allowing for changing Si isotope input to the ocean (59±5%), than when a constant Si isotope input is assumed (42–47±5%). This reduces but does not eliminate the difference relative to the Holocene (88±5%). Therefore, changes in Si isotope delivery to the ocean need to be taken into account in the precise reconstruction of ocean Si utilisation and primary productivity over glacial–interglacial timescales. |
format |
Article in Journal/Newspaper |
author |
Opfergelt, S. Burton, K.W. Pogge von Strandmann, P.A.E. Gislason, S.R. Halliday, A.N. |
spellingShingle |
Opfergelt, S. Burton, K.W. Pogge von Strandmann, P.A.E. Gislason, S.R. Halliday, A.N. Riverine silicon isotope variations in glaciated basaltic terrains: implications for the Si delivery to the ocean over glacial-interglacial intervals |
author_facet |
Opfergelt, S. Burton, K.W. Pogge von Strandmann, P.A.E. Gislason, S.R. Halliday, A.N. |
author_sort |
Opfergelt, S. |
title |
Riverine silicon isotope variations in glaciated basaltic terrains: implications for the Si delivery to the ocean over glacial-interglacial intervals |
title_short |
Riverine silicon isotope variations in glaciated basaltic terrains: implications for the Si delivery to the ocean over glacial-interglacial intervals |
title_full |
Riverine silicon isotope variations in glaciated basaltic terrains: implications for the Si delivery to the ocean over glacial-interglacial intervals |
title_fullStr |
Riverine silicon isotope variations in glaciated basaltic terrains: implications for the Si delivery to the ocean over glacial-interglacial intervals |
title_full_unstemmed |
Riverine silicon isotope variations in glaciated basaltic terrains: implications for the Si delivery to the ocean over glacial-interglacial intervals |
title_sort |
riverine silicon isotope variations in glaciated basaltic terrains: implications for the si delivery to the ocean over glacial-interglacial intervals |
publishDate |
2013 |
url |
http://www.vliz.be/nl/open-marien-archief?module=ref&refid=238273 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
%3Ci%3EEarth+Planet.+Sci.+Lett.+369-370%3C%2Fi%3E%3A+211-219.+%3Ca+href%3D%22https%3A%2F%2Fdx.doi.org%2F10.1016%2Fj.epsl.2013.03.025%22+target%3D%22_blank%22%3Ehttps%3A%2F%2Fdx.doi.org%2F10.1016%2Fj.epsl.2013.03.025%3C%2Fa%3E |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/000320684500021 info:eu-repo/semantics/altIdentifier/doi/doi.org/10.1016/j.epsl.2013.03.025 http://www.vliz.be/nl/open-marien-archief?module=ref&refid=238273 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.epsl.2013.03.025 |
container_title |
Earth and Planetary Science Letters |
container_volume |
369-370 |
container_start_page |
211 |
op_container_end_page |
219 |
_version_ |
1766207449224708096 |