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Sequestration and subduction of deep-sea carbonate in the global ocean since the Early Cretaceous

2018; Geological Society of America; Volume: 47; Issue: 1 Linguagem: Inglês

10.1130/g45424.1

1943-2682

Adriana Dutkiewicz, R. Dietmar Müller, John Cannon, Sioned Vaughan, Sabin Zahirovic,

Methane Hydrates and Related Phenomena

Research Article| December 12, 2018 Sequestration and subduction of deep-sea carbonate in the global ocean since the Early Cretaceous Adriana Dutkiewicz; Adriana Dutkiewicz 1EarthByte Group, School of Geosciences, University of Sydney, Sydney, NSW 2006, Australia Search for other works by this author on: GSW Google Scholar R. Dietmar Müller; R. Dietmar Müller 1EarthByte Group, School of Geosciences, University of Sydney, Sydney, NSW 2006, Australia Search for other works by this author on: GSW Google Scholar John Cannon; John Cannon 1EarthByte Group, School of Geosciences, University of Sydney, Sydney, NSW 2006, Australia Search for other works by this author on: GSW Google Scholar Sioned Vaughan; Sioned Vaughan 1EarthByte Group, School of Geosciences, University of Sydney, Sydney, NSW 2006, Australia Search for other works by this author on: GSW Google Scholar Sabin Zahirovic Sabin Zahirovic 1EarthByte Group, School of Geosciences, University of Sydney, Sydney, NSW 2006, Australia Search for other works by this author on: GSW Google Scholar Author and Article Information Adriana Dutkiewicz 1EarthByte Group, School of Geosciences, University of Sydney, Sydney, NSW 2006, Australia R. Dietmar Müller 1EarthByte Group, School of Geosciences, University of Sydney, Sydney, NSW 2006, Australia John Cannon 1EarthByte Group, School of Geosciences, University of Sydney, Sydney, NSW 2006, Australia Sioned Vaughan 1EarthByte Group, School of Geosciences, University of Sydney, Sydney, NSW 2006, Australia Sabin Zahirovic 1EarthByte Group, School of Geosciences, University of Sydney, Sydney, NSW 2006, Australia Publisher: Geological Society of America Received: 27 Jul 2018 Revision Received: 27 Nov 2018 Accepted: 29 Nov 2018 First Online: 12 Dec 2018 Online Issn: 1943-2682 Print Issn: 0091-7613 © 2018 Geological Society of America Geology (2019) 47 (1): 91–94. https://doi.org/10.1130/G45424.1 Article history Received: 27 Jul 2018 Revision Received: 27 Nov 2018 Accepted: 29 Nov 2018 First Online: 12 Dec 2018 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Adriana Dutkiewicz, R. Dietmar Müller, John Cannon, Sioned Vaughan, Sabin Zahirovic; Sequestration and subduction of deep-sea carbonate in the global ocean since the Early Cretaceous. Geology 2018;; 47 (1): 91–94. doi: https://doi.org/10.1130/G45424.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search 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, rift- and 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. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.