Lithium Isotope History of Cenozoic Seawater: Changes in Silicate Weathering and Reverse Weathering
Weathering of uplifted continental rocks consumes carbon dioxide and transports cations to the oceans, thereby playing a critical role in controlling both seawater chemistry and climate. However, there are few archives of seawater chemical change that reveal shifts in global tectonic forces connecti...
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Online Access: | http://eprints.esc.cam.ac.uk/2453/ http://eprints.esc.cam.ac.uk/2453/1/818.full.pdf https://doi.org/10.1126/science.1214697 |
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ftucambridgeesc:oai:eprints.esc.cam.ac.uk:2453 2023-05-15T18:00:47+02:00 Lithium Isotope History of Cenozoic Seawater: Changes in Silicate Weathering and Reverse Weathering Misra, S. Froelich, P. N. 2012-02 application/pdf http://eprints.esc.cam.ac.uk/2453/ http://eprints.esc.cam.ac.uk/2453/1/818.full.pdf https://doi.org/10.1126/science.1214697 en eng http://eprints.esc.cam.ac.uk/2453/1/818.full.pdf Misra, S. and Froelich, P. N. (2012) Lithium Isotope History of Cenozoic Seawater: Changes in Silicate Weathering and Reverse Weathering. Science, 335 (6070). pp. 818-823. ISSN 0036-8075 DOI https://doi.org/10.1126/science.1214697 <https://doi.org/10.1126/science.1214697> 01 - Climate Change and Earth-Ocean Atmosphere Systems Article PeerReviewed 2012 ftucambridgeesc https://doi.org/10.1126/science.1214697 2020-08-27T18:09:16Z Weathering of uplifted continental rocks consumes carbon dioxide and transports cations to the oceans, thereby playing a critical role in controlling both seawater chemistry and climate. However, there are few archives of seawater chemical change that reveal shifts in global tectonic forces connecting Earth ocean-climate processes. We present a 68-million-year record of lithium isotopes in seawater (δ7LiSW) reconstructed from planktonic foraminifera. From the Paleocene (60 million years ago) to the present, δ7LiSW rose by 9 per mil (‰), requiring large changes in continental weathering and seafloor reverse weathering that are consistent with increased tectonic uplift, more rapid continental denudation, increasingly incongruent continental weathering (lower chemical weathering intensity), and more rapid CO2 drawdown. A 5‰ drop in δ7LiSW across the Cretaceous-Paleogene boundary cannot be produced by an impactor or by Deccan trap volcanism, suggesting large-scale continental denudation. Article in Journal/Newspaper Planktonic foraminifera University of Cambridge, Department of Earth Sciences: ESC Publications Science 335 6070 818 823 |
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Open Polar |
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University of Cambridge, Department of Earth Sciences: ESC Publications |
op_collection_id |
ftucambridgeesc |
language |
English |
topic |
01 - Climate Change and Earth-Ocean Atmosphere Systems |
spellingShingle |
01 - Climate Change and Earth-Ocean Atmosphere Systems Misra, S. Froelich, P. N. Lithium Isotope History of Cenozoic Seawater: Changes in Silicate Weathering and Reverse Weathering |
topic_facet |
01 - Climate Change and Earth-Ocean Atmosphere Systems |
description |
Weathering of uplifted continental rocks consumes carbon dioxide and transports cations to the oceans, thereby playing a critical role in controlling both seawater chemistry and climate. However, there are few archives of seawater chemical change that reveal shifts in global tectonic forces connecting Earth ocean-climate processes. We present a 68-million-year record of lithium isotopes in seawater (δ7LiSW) reconstructed from planktonic foraminifera. From the Paleocene (60 million years ago) to the present, δ7LiSW rose by 9 per mil (‰), requiring large changes in continental weathering and seafloor reverse weathering that are consistent with increased tectonic uplift, more rapid continental denudation, increasingly incongruent continental weathering (lower chemical weathering intensity), and more rapid CO2 drawdown. A 5‰ drop in δ7LiSW across the Cretaceous-Paleogene boundary cannot be produced by an impactor or by Deccan trap volcanism, suggesting large-scale continental denudation. |
format |
Article in Journal/Newspaper |
author |
Misra, S. Froelich, P. N. |
author_facet |
Misra, S. Froelich, P. N. |
author_sort |
Misra, S. |
title |
Lithium Isotope History of Cenozoic Seawater: Changes in Silicate Weathering and Reverse Weathering |
title_short |
Lithium Isotope History of Cenozoic Seawater: Changes in Silicate Weathering and Reverse Weathering |
title_full |
Lithium Isotope History of Cenozoic Seawater: Changes in Silicate Weathering and Reverse Weathering |
title_fullStr |
Lithium Isotope History of Cenozoic Seawater: Changes in Silicate Weathering and Reverse Weathering |
title_full_unstemmed |
Lithium Isotope History of Cenozoic Seawater: Changes in Silicate Weathering and Reverse Weathering |
title_sort |
lithium isotope history of cenozoic seawater: changes in silicate weathering and reverse weathering |
publishDate |
2012 |
url |
http://eprints.esc.cam.ac.uk/2453/ http://eprints.esc.cam.ac.uk/2453/1/818.full.pdf https://doi.org/10.1126/science.1214697 |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_relation |
http://eprints.esc.cam.ac.uk/2453/1/818.full.pdf Misra, S. and Froelich, P. N. (2012) Lithium Isotope History of Cenozoic Seawater: Changes in Silicate Weathering and Reverse Weathering. Science, 335 (6070). pp. 818-823. ISSN 0036-8075 DOI https://doi.org/10.1126/science.1214697 <https://doi.org/10.1126/science.1214697> |
op_doi |
https://doi.org/10.1126/science.1214697 |
container_title |
Science |
container_volume |
335 |
container_issue |
6070 |
container_start_page |
818 |
op_container_end_page |
823 |
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1766170035684900864 |