Neoproterozoic ice ages, boron isotopes, and ocean acidification:Implications for a snowball Earth
The Neoproterozoic Earth underwent at least two severe glaciations, each extending to low paleomagnetic latitudes and punctuating warmer climates. The two widespread older and younger Cryogenian glacial deposits in Namibia are directly overlain by cap carbonates deposited under inferred periods of h...
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Online Access: | https://research-portal.st-andrews.ac.uk/en/publications/902c4949-3334-483f-9d55-62f992e7b231 https://doi.org/10.1130/G30851.1 http://www.scopus.com/inward/record.url?scp=77958095296&partnerID=8YFLogxK |
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ftunstandrewcris:oai:research-portal.st-andrews.ac.uk:publications/902c4949-3334-483f-9d55-62f992e7b231 2024-09-15T18:28:06+00:00 Neoproterozoic ice ages, boron isotopes, and ocean acidification:Implications for a snowball Earth Kasemann, Simone A. Prave, Tony Fallick, Anthony E. Hawkesworth, Chris Hoffmann, Karl-Heinz 2010-09 https://research-portal.st-andrews.ac.uk/en/publications/902c4949-3334-483f-9d55-62f992e7b231 https://doi.org/10.1130/G30851.1 http://www.scopus.com/inward/record.url?scp=77958095296&partnerID=8YFLogxK eng eng https://research-portal.st-andrews.ac.uk/en/publications/902c4949-3334-483f-9d55-62f992e7b231 info:eu-repo/semantics/restrictedAccess Kasemann , S A , Prave , T , Fallick , A E , Hawkesworth , C & Hoffmann , K-H 2010 , ' Neoproterozoic ice ages, boron isotopes, and ocean acidification : Implications for a snowball Earth ' , Geology , vol. 38 , no. 9 , pp. 775-778 . https://doi.org/10.1130/G30851.1 CARBON CHEMISTRY CONSTRAINTS GLACIATION TRANSITION CALCIUM NAMIBIA PH article 2010 ftunstandrewcris https://doi.org/10.1130/G30851.1 2024-08-28T23:42:37Z The Neoproterozoic Earth underwent at least two severe glaciations, each extending to low paleomagnetic latitudes and punctuating warmer climates. The two widespread older and younger Cryogenian glacial deposits in Namibia are directly overlain by cap carbonates deposited under inferred periods of high atmospheric carbon dioxide concentrations. Oceanic uptake of carbon dioxide decreases ocean pH; here we present a record of Cryogenian interglacial ocean pH, based on boron ( B) isotopes in marine carbonates. Our data suggest a largely constant ocean pH and no critically elevated pCO(2) throughout the older postglacial and interglacial periods. In contrast, a marked ocean acidification event marks the younger deglaciation period and is compatible with elevated postglacial pCO(2) concentration. Our data are consistent with the presence of two panglacial climate states in the Cryogenian, but indicate that each had its own distinct environmental conditions. Article in Journal/Newspaper Ocean acidification University of St Andrews: Research Portal Geology 38 9 775 778 |
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Open Polar |
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University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
CARBON CHEMISTRY CONSTRAINTS GLACIATION TRANSITION CALCIUM NAMIBIA PH |
spellingShingle |
CARBON CHEMISTRY CONSTRAINTS GLACIATION TRANSITION CALCIUM NAMIBIA PH Kasemann, Simone A. Prave, Tony Fallick, Anthony E. Hawkesworth, Chris Hoffmann, Karl-Heinz Neoproterozoic ice ages, boron isotopes, and ocean acidification:Implications for a snowball Earth |
topic_facet |
CARBON CHEMISTRY CONSTRAINTS GLACIATION TRANSITION CALCIUM NAMIBIA PH |
description |
The Neoproterozoic Earth underwent at least two severe glaciations, each extending to low paleomagnetic latitudes and punctuating warmer climates. The two widespread older and younger Cryogenian glacial deposits in Namibia are directly overlain by cap carbonates deposited under inferred periods of high atmospheric carbon dioxide concentrations. Oceanic uptake of carbon dioxide decreases ocean pH; here we present a record of Cryogenian interglacial ocean pH, based on boron ( B) isotopes in marine carbonates. Our data suggest a largely constant ocean pH and no critically elevated pCO(2) throughout the older postglacial and interglacial periods. In contrast, a marked ocean acidification event marks the younger deglaciation period and is compatible with elevated postglacial pCO(2) concentration. Our data are consistent with the presence of two panglacial climate states in the Cryogenian, but indicate that each had its own distinct environmental conditions. |
format |
Article in Journal/Newspaper |
author |
Kasemann, Simone A. Prave, Tony Fallick, Anthony E. Hawkesworth, Chris Hoffmann, Karl-Heinz |
author_facet |
Kasemann, Simone A. Prave, Tony Fallick, Anthony E. Hawkesworth, Chris Hoffmann, Karl-Heinz |
author_sort |
Kasemann, Simone A. |
title |
Neoproterozoic ice ages, boron isotopes, and ocean acidification:Implications for a snowball Earth |
title_short |
Neoproterozoic ice ages, boron isotopes, and ocean acidification:Implications for a snowball Earth |
title_full |
Neoproterozoic ice ages, boron isotopes, and ocean acidification:Implications for a snowball Earth |
title_fullStr |
Neoproterozoic ice ages, boron isotopes, and ocean acidification:Implications for a snowball Earth |
title_full_unstemmed |
Neoproterozoic ice ages, boron isotopes, and ocean acidification:Implications for a snowball Earth |
title_sort |
neoproterozoic ice ages, boron isotopes, and ocean acidification:implications for a snowball earth |
publishDate |
2010 |
url |
https://research-portal.st-andrews.ac.uk/en/publications/902c4949-3334-483f-9d55-62f992e7b231 https://doi.org/10.1130/G30851.1 http://www.scopus.com/inward/record.url?scp=77958095296&partnerID=8YFLogxK |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
Kasemann , S A , Prave , T , Fallick , A E , Hawkesworth , C & Hoffmann , K-H 2010 , ' Neoproterozoic ice ages, boron isotopes, and ocean acidification : Implications for a snowball Earth ' , Geology , vol. 38 , no. 9 , pp. 775-778 . https://doi.org/10.1130/G30851.1 |
op_relation |
https://research-portal.st-andrews.ac.uk/en/publications/902c4949-3334-483f-9d55-62f992e7b231 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1130/G30851.1 |
container_title |
Geology |
container_volume |
38 |
container_issue |
9 |
container_start_page |
775 |
op_container_end_page |
778 |
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1810469408407027712 |