Continental weathering following a Cryogenian glaciation:Evidence from calcium and magnesium isotopes
A marked ocean acidification event and elevated atmospheric carbon dioxide concentrations following the extreme environmental conditions of the younger Cryogenian glaciation have been inferred from boron isotope measurements. Calcium and magnesium isotope analyses offer additional insights into the...
Published in: | Earth and Planetary Science Letters |
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Language: | English |
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2014
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Online Access: | https://hdl.handle.net/1983/73dd7c8f-cb83-4a7a-906c-0fc37da4989e https://research-information.bris.ac.uk/en/publications/73dd7c8f-cb83-4a7a-906c-0fc37da4989e https://doi.org/10.1016/j.epsl.2014.03.048 |
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ftubristolcris:oai:research-information.bris.ac.uk:publications/73dd7c8f-cb83-4a7a-906c-0fc37da4989e 2024-04-28T08:34:51+00:00 Continental weathering following a Cryogenian glaciation:Evidence from calcium and magnesium isotopes Kasemann, Simone A. von Strandmann, Philip A. E. Pogge Prave, Anthony R. Fallick, Anthony E. Elliott, Tim Hoffmann, Karl-Heinz 2014-06-15 https://hdl.handle.net/1983/73dd7c8f-cb83-4a7a-906c-0fc37da4989e https://research-information.bris.ac.uk/en/publications/73dd7c8f-cb83-4a7a-906c-0fc37da4989e https://doi.org/10.1016/j.epsl.2014.03.048 eng eng https://research-information.bris.ac.uk/en/publications/73dd7c8f-cb83-4a7a-906c-0fc37da4989e info:eu-repo/semantics/restrictedAccess Kasemann , S A , von Strandmann , P A E P , Prave , A R , Fallick , A E , Elliott , T & Hoffmann , K-H 2014 , ' Continental weathering following a Cryogenian glaciation : Evidence from calcium and magnesium isotopes ' , Earth and Planetary Science Letters , vol. 396 , pp. 66-77 . https://doi.org/10.1016/j.epsl.2014.03.048 calcium isotopes magnesium isotopes continental weathering cap carbonates Neoproterozoic ATMOSPHERIC CARBON-DIOXIDE NEOPROTEROZOIC ICE AGES SNOWBALL EARTH CA ISOTOPES INORGANIC CALCITE AMAZON CRATON LOW-LATITUDE PORE-FLUID CYCLE FRACTIONATION article 2014 ftubristolcris https://doi.org/10.1016/j.epsl.2014.03.048 2024-04-03T15:23:47Z A marked ocean acidification event and elevated atmospheric carbon dioxide concentrations following the extreme environmental conditions of the younger Cryogenian glaciation have been inferred from boron isotope measurements. Calcium and magnesium isotope analyses offer additional insights into the processes occurring during this time. Data from Neoproterozoic sections in Namibia indicate that following the end of glaciation the continental weathering flux transitioned from being of mixed carbonate and silicate character to a silicate-dominated one. Combined with the effects of primary dolomite formation in the cap dolostones, this caused the ocean to depart from a state of acidification and return to higher pH after climatic amelioration. Differences in the magnitude of stratigraphic isotopic changes across the continental margin of the southern Congo craton shelf point to local influences modifying and amplifying the global signal, which need to be considered in order to avoid overestimation of the worldwide chemical weathering flux. (C) 2014 Elsevier B.V. All rights reserved. Article in Journal/Newspaper Ocean acidification University of Bristol: Bristol Research Earth and Planetary Science Letters 396 66 77 |
institution |
Open Polar |
collection |
University of Bristol: Bristol Research |
op_collection_id |
ftubristolcris |
language |
English |
topic |
calcium isotopes magnesium isotopes continental weathering cap carbonates Neoproterozoic ATMOSPHERIC CARBON-DIOXIDE NEOPROTEROZOIC ICE AGES SNOWBALL EARTH CA ISOTOPES INORGANIC CALCITE AMAZON CRATON LOW-LATITUDE PORE-FLUID CYCLE FRACTIONATION |
spellingShingle |
calcium isotopes magnesium isotopes continental weathering cap carbonates Neoproterozoic ATMOSPHERIC CARBON-DIOXIDE NEOPROTEROZOIC ICE AGES SNOWBALL EARTH CA ISOTOPES INORGANIC CALCITE AMAZON CRATON LOW-LATITUDE PORE-FLUID CYCLE FRACTIONATION Kasemann, Simone A. von Strandmann, Philip A. E. Pogge Prave, Anthony R. Fallick, Anthony E. Elliott, Tim Hoffmann, Karl-Heinz Continental weathering following a Cryogenian glaciation:Evidence from calcium and magnesium isotopes |
topic_facet |
calcium isotopes magnesium isotopes continental weathering cap carbonates Neoproterozoic ATMOSPHERIC CARBON-DIOXIDE NEOPROTEROZOIC ICE AGES SNOWBALL EARTH CA ISOTOPES INORGANIC CALCITE AMAZON CRATON LOW-LATITUDE PORE-FLUID CYCLE FRACTIONATION |
description |
A marked ocean acidification event and elevated atmospheric carbon dioxide concentrations following the extreme environmental conditions of the younger Cryogenian glaciation have been inferred from boron isotope measurements. Calcium and magnesium isotope analyses offer additional insights into the processes occurring during this time. Data from Neoproterozoic sections in Namibia indicate that following the end of glaciation the continental weathering flux transitioned from being of mixed carbonate and silicate character to a silicate-dominated one. Combined with the effects of primary dolomite formation in the cap dolostones, this caused the ocean to depart from a state of acidification and return to higher pH after climatic amelioration. Differences in the magnitude of stratigraphic isotopic changes across the continental margin of the southern Congo craton shelf point to local influences modifying and amplifying the global signal, which need to be considered in order to avoid overestimation of the worldwide chemical weathering flux. (C) 2014 Elsevier B.V. All rights reserved. |
format |
Article in Journal/Newspaper |
author |
Kasemann, Simone A. von Strandmann, Philip A. E. Pogge Prave, Anthony R. Fallick, Anthony E. Elliott, Tim Hoffmann, Karl-Heinz |
author_facet |
Kasemann, Simone A. von Strandmann, Philip A. E. Pogge Prave, Anthony R. Fallick, Anthony E. Elliott, Tim Hoffmann, Karl-Heinz |
author_sort |
Kasemann, Simone A. |
title |
Continental weathering following a Cryogenian glaciation:Evidence from calcium and magnesium isotopes |
title_short |
Continental weathering following a Cryogenian glaciation:Evidence from calcium and magnesium isotopes |
title_full |
Continental weathering following a Cryogenian glaciation:Evidence from calcium and magnesium isotopes |
title_fullStr |
Continental weathering following a Cryogenian glaciation:Evidence from calcium and magnesium isotopes |
title_full_unstemmed |
Continental weathering following a Cryogenian glaciation:Evidence from calcium and magnesium isotopes |
title_sort |
continental weathering following a cryogenian glaciation:evidence from calcium and magnesium isotopes |
publishDate |
2014 |
url |
https://hdl.handle.net/1983/73dd7c8f-cb83-4a7a-906c-0fc37da4989e https://research-information.bris.ac.uk/en/publications/73dd7c8f-cb83-4a7a-906c-0fc37da4989e https://doi.org/10.1016/j.epsl.2014.03.048 |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
Kasemann , S A , von Strandmann , P A E P , Prave , A R , Fallick , A E , Elliott , T & Hoffmann , K-H 2014 , ' Continental weathering following a Cryogenian glaciation : Evidence from calcium and magnesium isotopes ' , Earth and Planetary Science Letters , vol. 396 , pp. 66-77 . https://doi.org/10.1016/j.epsl.2014.03.048 |
op_relation |
https://research-information.bris.ac.uk/en/publications/73dd7c8f-cb83-4a7a-906c-0fc37da4989e |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.epsl.2014.03.048 |
container_title |
Earth and Planetary Science Letters |
container_volume |
396 |
container_start_page |
66 |
op_container_end_page |
77 |
_version_ |
1797591390651154432 |