气候变化领域集成服务门户(CCPortal): The impact of Early Cretaceous gateway evolution on ocean circulation and organic carbon burial in the emerging South Atlantic and Southern Ocean basins

CCPortal

DOI	10.1016/j.epsl.2019.115890
	The impact of Early Cretaceous gateway evolution on ocean circulation and organic carbon burial in the emerging South Atlantic and Southern Ocean basins
	Dummann W.; Steinig S.; Hofmann P.; Flögel S.; Osborne A.H.; Frank M.; Herrle J.O.; Bretschneider L.; Sheward R.M.; Wagner T.
发表日期	2020
ISSN	0012821X
卷号	530
英文摘要	Organic carbon burial is an important driver of carbon cycle and climate dynamics on geological and shorter time scales. Ocean basins emerging during the Early Cretaceous break-up of Gondwana were primary sites of organic carbon burial, implying that their tectonic and oceanographic evolution may have affected trends and perturbations in global climate via changes in local organic carbon burial. Assessing the role of individual ocean basins in the global carbon-climate context requires a sound understanding of the processes that induced large-scale changes in carbon burial and the timing of these changes. Here we reconstruct the oceanographic evolution, and its links to organic carbon burial, in the Barremian to Albian South Atlantic and Southern Ocean basins, which may have acted as carbon sinks of global importance. Our reconstruction is based on combined seawater neodymium isotope and sedimentological records obtained from multiple deep sea drill sites and a new general circulation model. Deep water circulation within and between those basins was primarily controlled by the opening of the shallow Falkland Plateau Gateway (between ∼118 Ma and ∼113 Ma) and the deep Georgia Basin Gateway (by ∼110 Ma), for which we provide new age constraints based on biostratigraphic and carbon isotope data. The opening of these gateways was accompanied by local to basin-wide decreases in organic carbon burial, suggesting that ocean circulation affected the oxygenation state via changes in deep water ventilation. Although our data do not provide quantitative information on the impact of changes in regional organic carbon burial on the global carbon cycle, the synchronicity between the reduction of organic carbon burial in the South Atlantic basin and global warming during the Early Albian points to a strong causal relationship. © 2019
关键词	Early Cretaceous gateways neodymium isotopes ocean circulation organic carbon burial South Atlantic
英文关键词	Deepwater drilling; Gateways (computer networks); Global warming; Isotopes; Oceanography; Early Cretaceous; Neodymium isotopes; Ocean circulation; Organic carbon burial; South Atlantic; Organic carbon; Albian; Barremian; burial (geology); carbon sink; neodymium isotope; ocean basin; oceanic circulation; organic carbon; reconstruction; seawater; Atlantic Ocean; Atlantic Ocean (South); Southern Ocean
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202571
作者单位	Institute of Geology and Mineralogy, University of Cologne, Zülpicher Str. 49a, Cologne, D-50674, Germany; GEOMAR Helmholtz Centre for Ocean Research Kiel, Wischhofstr. 1-3, Kiel, D-24148, Germany; Institute of Geosciences, Goethe-University Frankfurt, Altenhöferallee 1, Frankfurt am Main, D-60438, Germany; Biodiversity and Climate Research Centre (BIK-F), Senckenberganlage 25, Frankfurt am Main, D-60325, Germany; Lyell Centre, School of Energy, Geoscience, Infrastructure and Society, Heriot-Watt University, Edinburgh, EH14 4AS, United Kingdom
推荐引用方式 GB/T 7714	Dummann W.,Steinig S.,Hofmann P.,et al. The impact of Early Cretaceous gateway evolution on ocean circulation and organic carbon burial in the emerging South Atlantic and Southern Ocean basins[J],2020,530.
APA	Dummann W..,Steinig S..,Hofmann P..,Flögel S..,Osborne A.H..,...&Wagner T..(2020).The impact of Early Cretaceous gateway evolution on ocean circulation and organic carbon burial in the emerging South Atlantic and Southern Ocean basins.Earth and Planetary Science Letters,530.
MLA	Dummann W.,et al."The impact of Early Cretaceous gateway evolution on ocean circulation and organic carbon burial in the emerging South Atlantic and Southern Ocean basins".Earth and Planetary Science Letters 530(2020).