Sequestration and subduction of deep-sea carbonate in the global ocean since the Early Cretaceous
Field | Value | Language |
dc.contributor.author | Dutkiewicz, Adriana | |
dc.contributor.author | Cannon, John S. | |
dc.contributor.author | Müller, Dietmar R. | |
dc.contributor.author | Vaughan, Sioned | |
dc.contributor.author | Zahirovic, Sabin | |
dc.date.accessioned | 2020-01-15 | |
dc.date.available | 2020-01-15 | |
dc.date.issued | 2019-01-01 | |
dc.identifier.citation | Dutkiewicz, A., Müller, R. D., Cannon, J., Vaughan, S., & Zahirovic, S. (2018). Sequestration and subduction of deep-sea carbonate in the global ocean since the Early Cretaceous. Geology, 47(1), 91–94. https://doi.org/10.1130/g45424.1 | en_AU |
dc.identifier.issn | 00917613 | |
dc.identifier.uri | https://hdl.handle.net/2123/21683 | |
dc.description | We thank two anonymous reviewers, and editor Judith Totman Parrish, for their constructive comments. This research was supported by the Deep Carbon Observatory and Alfred P. Sloan Foundation grant G-2017–9997. | en_AU |
dc.description.abstract | Deep-sea carbonate represents Earth's largest carbon sink and one of the least-known components of the long-term carbon cycle that is intimately linked to climate. By coupling the deep-sea carbonate sedimentation history to a global tectonic model, we quantify this component within the framework of a continuously evolving seafloor. A long-term increase in marine carbonate carbon flux since the mid-Cretaceous is dominated by a post-50 Ma doubling of carbonate accumulation to ~310 Mt C/yr at present-day. This increase was caused largely by the immense growth in deep-sea carbonate carbon storage, post-dating the end of the Early Eocene Climate Optimum. We suggest that a combination of a retreat of epicontinental seas, underpinned by long-term deepening of the seafloor, the inception of major Himalayan river systems, and the weathering of the Deccan Traps drove enhanced delivery of Ca2+ and HCO3 - into the oceans and atmospheric CO2 drawdown in the 15 m.y. prior to the onset of glaciation at ca. 35 Ma. Relatively stagnant mid-ocean ridge, riftand subduction-related degassing during this period support our contention that continental silicate weathering, rather than a major decrease in CO2 degassing, may have triggered an increase in marine carbonate accumulation and long-term Eocene global cooling. Our results provide new constraints for global carbon cycle models, and may improve our understanding of carbonate subduction-related metamorphism, mineralization and isotopic signatures of degassing. © 2018 Geological Society of America. | en_AU |
dc.description.sponsorship | Alfred P. Sloan Foundation-G-2017–9997 | en_AU |
dc.language.iso | en_AU | en_AU |
dc.publisher | Geological Society of America. | en_AU |
dc.relation | Alfred P. Sloan Foundation- G-2017–9997 | en_AU |
dc.rights | © 2018 Geological Society of America. | en_AU |
dc.subject | carbon sequestration | en_AU |
dc.subject | Cretaceous | en_AU |
dc.subject | Global tectonics | en_AU |
dc.title | Sequestration and subduction of deep-sea carbonate in the global ocean since the Early Cretaceous | en_AU |
dc.type | Article | en_AU |
dc.subject.asrc | 040402 | en_AU |
dc.subject.asrc | 040305 | en_AU |
dc.identifier.doi | 10.1130/G45424.1 | |
dc.type.pubtype | Post-print | en_AU |
Associated file/s
Associated collections