Dynamic sedimentary conditions during periods of enhanced sequestration of organic carbon in the central southern Tethys at the onset of the Cenozoic global cooling
Stagnant bottom-water conditions (e.g., low and stable redox potential, long-water residence time) is an assumption commonly used to explain the preservation and burial of high amounts of organic carbon (C-org) in marine sediments. Rather than stagnant conditions, the evidence presented here from no...
Published in: | Sedimentary Geology |
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2013
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Online Access: | https://pure.au.dk/portal/en/publications/13d73eba-ba18-40c0-bba1-77c181190370 https://doi.org/10.1016/j.sedgeo.2013.03.003 |
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ftuniaarhuspubl:oai:pure.atira.dk:publications/13d73eba-ba18-40c0-bba1-77c181190370 2024-09-09T19:58:16+00:00 Dynamic sedimentary conditions during periods of enhanced sequestration of organic carbon in the central southern Tethys at the onset of the Cenozoic global cooling Berrocoso, Alvaro Jimenez Bodin, Stephane Wood, Jonathan Calvert, Stephen E. Mutterlose, Joerg Petrizzo, Maria Rose Redfern, Jonathan 2013-05-15 https://pure.au.dk/portal/en/publications/13d73eba-ba18-40c0-bba1-77c181190370 https://doi.org/10.1016/j.sedgeo.2013.03.003 eng eng https://pure.au.dk/portal/en/publications/13d73eba-ba18-40c0-bba1-77c181190370 info:eu-repo/semantics/restrictedAccess Berrocoso , A J , Bodin , S , Wood , J , Calvert , S E , Mutterlose , J , Petrizzo , M R & Redfern , J 2013 , ' Dynamic sedimentary conditions during periods of enhanced sequestration of organic carbon in the central southern Tethys at the onset of the Cenozoic global cooling ' , Sedimentary Geology , vol. 290 , pp. 60-84 . https://doi.org/10.1016/j.sedgeo.2013.03.003 Organic carbon sequestration Carbonate sedimentation Bottom-water oxygen depletion Coastal upwelling Southern Tethys Early to middle Eocene EL-GARIA FORMATION RAMP DEPOSITIONAL SYSTEMS TROPICAL NORTH-ATLANTIC OCEANIC ANOXIC EVENT BLACK SHALES SEA-LEVEL PETROLEUM GEOLOGY OFFSHORE TUNISIA IBERIAN BASIN MIDDLE-EAST article 2013 ftuniaarhuspubl https://doi.org/10.1016/j.sedgeo.2013.03.003 2024-06-18T14:16:16Z Stagnant bottom-water conditions (e.g., low and stable redox potential, long-water residence time) is an assumption commonly used to explain the preservation and burial of high amounts of organic carbon (C-org) in marine sediments. Rather than stagnant conditions, the evidence presented here from north-central Tunisia supports dynamic conditions during formation of variably C-org-rich, outermost shelf carbonates of the early-middle Eocene. The dynamic conditions are inferred by the deposition of four distinct lithofacies in this outermost shelf setting. Shedding of carbonate (i.e., mud and fragmented bioclasts) from the shallower source areas controlled the distribution of all lithofacies, with higher amounts of transported benthic debris occurring in the most proximal lithofacies and vice versa. This carbonate shedding also controlled the deposition of three orders of lithological cycles, from limestone/marly limestone couplets grading to cycles made up of groups of couplets. Bottom-water redox potential varied in intensity throughout this depositional setting, with moderate oxygen depletion (suboxic conditions) in the southern sector of north-central Tunisia and much higher oxygenation in the northern area. Evidence for suboxic bottom waters in the southern sector (higher C-org contents) is provided by higher trace metal (Cu, Ni, Zn, Cr, Mo, U and V) enrichments than in the northern area. Regionally heterogeneous primary productivity of surface waters is suggested to have caused a higher C-org burial flux in the southern sector compared to the north, a situation interpreted to have been related to varying upwelling patterns due to the effects of regional palaeogeography and the dominant wind patterns. The deposition of the studied C-org-rich carbonates spanned part of the calcareous nannofossil Zones NP13 to NP14 (similar to 50-48 m.y. ago) and coincided with the initiation of the Cenozoic global cooling subsequent to the early Eocene climatic optimum (EECO) (similar to 52-50 m.y. ago). An implication is that ... Article in Journal/Newspaper North Atlantic Aarhus University: Research Sedimentary Geology 290 60 84 |
institution |
Open Polar |
collection |
Aarhus University: Research |
op_collection_id |
ftuniaarhuspubl |
language |
English |
topic |
Organic carbon sequestration Carbonate sedimentation Bottom-water oxygen depletion Coastal upwelling Southern Tethys Early to middle Eocene EL-GARIA FORMATION RAMP DEPOSITIONAL SYSTEMS TROPICAL NORTH-ATLANTIC OCEANIC ANOXIC EVENT BLACK SHALES SEA-LEVEL PETROLEUM GEOLOGY OFFSHORE TUNISIA IBERIAN BASIN MIDDLE-EAST |
spellingShingle |
Organic carbon sequestration Carbonate sedimentation Bottom-water oxygen depletion Coastal upwelling Southern Tethys Early to middle Eocene EL-GARIA FORMATION RAMP DEPOSITIONAL SYSTEMS TROPICAL NORTH-ATLANTIC OCEANIC ANOXIC EVENT BLACK SHALES SEA-LEVEL PETROLEUM GEOLOGY OFFSHORE TUNISIA IBERIAN BASIN MIDDLE-EAST Berrocoso, Alvaro Jimenez Bodin, Stephane Wood, Jonathan Calvert, Stephen E. Mutterlose, Joerg Petrizzo, Maria Rose Redfern, Jonathan Dynamic sedimentary conditions during periods of enhanced sequestration of organic carbon in the central southern Tethys at the onset of the Cenozoic global cooling |
topic_facet |
Organic carbon sequestration Carbonate sedimentation Bottom-water oxygen depletion Coastal upwelling Southern Tethys Early to middle Eocene EL-GARIA FORMATION RAMP DEPOSITIONAL SYSTEMS TROPICAL NORTH-ATLANTIC OCEANIC ANOXIC EVENT BLACK SHALES SEA-LEVEL PETROLEUM GEOLOGY OFFSHORE TUNISIA IBERIAN BASIN MIDDLE-EAST |
description |
Stagnant bottom-water conditions (e.g., low and stable redox potential, long-water residence time) is an assumption commonly used to explain the preservation and burial of high amounts of organic carbon (C-org) in marine sediments. Rather than stagnant conditions, the evidence presented here from north-central Tunisia supports dynamic conditions during formation of variably C-org-rich, outermost shelf carbonates of the early-middle Eocene. The dynamic conditions are inferred by the deposition of four distinct lithofacies in this outermost shelf setting. Shedding of carbonate (i.e., mud and fragmented bioclasts) from the shallower source areas controlled the distribution of all lithofacies, with higher amounts of transported benthic debris occurring in the most proximal lithofacies and vice versa. This carbonate shedding also controlled the deposition of three orders of lithological cycles, from limestone/marly limestone couplets grading to cycles made up of groups of couplets. Bottom-water redox potential varied in intensity throughout this depositional setting, with moderate oxygen depletion (suboxic conditions) in the southern sector of north-central Tunisia and much higher oxygenation in the northern area. Evidence for suboxic bottom waters in the southern sector (higher C-org contents) is provided by higher trace metal (Cu, Ni, Zn, Cr, Mo, U and V) enrichments than in the northern area. Regionally heterogeneous primary productivity of surface waters is suggested to have caused a higher C-org burial flux in the southern sector compared to the north, a situation interpreted to have been related to varying upwelling patterns due to the effects of regional palaeogeography and the dominant wind patterns. The deposition of the studied C-org-rich carbonates spanned part of the calcareous nannofossil Zones NP13 to NP14 (similar to 50-48 m.y. ago) and coincided with the initiation of the Cenozoic global cooling subsequent to the early Eocene climatic optimum (EECO) (similar to 52-50 m.y. ago). An implication is that ... |
format |
Article in Journal/Newspaper |
author |
Berrocoso, Alvaro Jimenez Bodin, Stephane Wood, Jonathan Calvert, Stephen E. Mutterlose, Joerg Petrizzo, Maria Rose Redfern, Jonathan |
author_facet |
Berrocoso, Alvaro Jimenez Bodin, Stephane Wood, Jonathan Calvert, Stephen E. Mutterlose, Joerg Petrizzo, Maria Rose Redfern, Jonathan |
author_sort |
Berrocoso, Alvaro Jimenez |
title |
Dynamic sedimentary conditions during periods of enhanced sequestration of organic carbon in the central southern Tethys at the onset of the Cenozoic global cooling |
title_short |
Dynamic sedimentary conditions during periods of enhanced sequestration of organic carbon in the central southern Tethys at the onset of the Cenozoic global cooling |
title_full |
Dynamic sedimentary conditions during periods of enhanced sequestration of organic carbon in the central southern Tethys at the onset of the Cenozoic global cooling |
title_fullStr |
Dynamic sedimentary conditions during periods of enhanced sequestration of organic carbon in the central southern Tethys at the onset of the Cenozoic global cooling |
title_full_unstemmed |
Dynamic sedimentary conditions during periods of enhanced sequestration of organic carbon in the central southern Tethys at the onset of the Cenozoic global cooling |
title_sort |
dynamic sedimentary conditions during periods of enhanced sequestration of organic carbon in the central southern tethys at the onset of the cenozoic global cooling |
publishDate |
2013 |
url |
https://pure.au.dk/portal/en/publications/13d73eba-ba18-40c0-bba1-77c181190370 https://doi.org/10.1016/j.sedgeo.2013.03.003 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Berrocoso , A J , Bodin , S , Wood , J , Calvert , S E , Mutterlose , J , Petrizzo , M R & Redfern , J 2013 , ' Dynamic sedimentary conditions during periods of enhanced sequestration of organic carbon in the central southern Tethys at the onset of the Cenozoic global cooling ' , Sedimentary Geology , vol. 290 , pp. 60-84 . https://doi.org/10.1016/j.sedgeo.2013.03.003 |
op_relation |
https://pure.au.dk/portal/en/publications/13d73eba-ba18-40c0-bba1-77c181190370 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.sedgeo.2013.03.003 |
container_title |
Sedimentary Geology |
container_volume |
290 |
container_start_page |
60 |
op_container_end_page |
84 |
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1809929251687759872 |