Potential links between continental rifting, CO2 degassing and climate change through time

Potential links between continental rifting, CO2 degassing and climate change through time The concentration of CO2 in the atmosphere is a key influence on Earth’s climate. Today, significant quantities of CO2 are emitted at continental rifts, suggesting that the spatial and temporal extent of rift systems may have influenced deep carbon fluxes and thus climate change throughout geological time. Here we test this hypothesis by conducting a worldwide census of continental rift lengths over the last 200 million years. We estimate tectonic CO2 release rates through time and show that along the extensive Mesozoic and Cenozoic rift systems, rift-related CO2 degassing rates reached more than 300% of present-day values. Using a numerical carbon cycle model, we find that two prominent periods of enhanced rifting 160 to 100 million years ago and after 55 million years ago coincided with greenhouse climate episodes, during which atmospheric CO2 concentrations were more than three times higher than today. We therefore propose that continental fragmentation and long-term climate change could plausibly be linked via massive CO2 degassing in rift systems. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Nature Geoscience Springer Journals

Potential links between continental rifting, CO2 degassing and climate change through time

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Publisher
Springer Journals
Copyright
Copyright © 2017 by The Author(s)
Subject
Earth Sciences; Earth Sciences, general; Geology; Geochemistry; Geophysics/Geodesy; Earth System Sciences
ISSN
1752-0894
eISSN
1752-0908
D.O.I.
10.1038/s41561-017-0003-6
Publisher site
See Article on Publisher Site

Abstract

The concentration of CO2 in the atmosphere is a key influence on Earth’s climate. Today, significant quantities of CO2 are emitted at continental rifts, suggesting that the spatial and temporal extent of rift systems may have influenced deep carbon fluxes and thus climate change throughout geological time. Here we test this hypothesis by conducting a worldwide census of continental rift lengths over the last 200 million years. We estimate tectonic CO2 release rates through time and show that along the extensive Mesozoic and Cenozoic rift systems, rift-related CO2 degassing rates reached more than 300% of present-day values. Using a numerical carbon cycle model, we find that two prominent periods of enhanced rifting 160 to 100 million years ago and after 55 million years ago coincided with greenhouse climate episodes, during which atmospheric CO2 concentrations were more than three times higher than today. We therefore propose that continental fragmentation and long-term climate change could plausibly be linked via massive CO2 degassing in rift systems.

Journal

Nature GeoscienceSpringer Journals

Published: Nov 13, 2017

References

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