globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2019.115890
论文题名:
The impact of Early Cretaceous gateway evolution on ocean circulation and organic carbon burial in the emerging South Atlantic and Southern Ocean basins
作者: Dummann W.; Steinig S.; Hofmann P.; Flögel S.; Osborne A.H.; Frank M.; Herrle J.O.; Bretschneider L.; Sheward R.M.; Wagner T.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 530
语种: 英语
中文关键词: 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
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
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164949
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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

Recommended Citation:
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]. Earth and Planetary Science Letters,2020-01-01,530
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