Modelling biogeochemical-stratigraphic dynamics of clinoform successions over geological timescales

TY - ABST

T1 - Modelling biogeochemical-stratigraphic dynamics of clinoform successions over geological timescales

AU - Legarth, Jens Jakob Fosselius

AU - Bjerrum, Christian J.

N1 - Værtspublikationsredaktører: R. Steel

PY - 2008

Y1 - 2008

N2 - An understanding of the processes-dynamics governing the development of submarine fine grained clinoforms relies often on correlation of proxies (grain-size trends, spectral gamma, microfossils, TOC, d13C etc.) to more proximal settings where relative sea-level changes are more easily detected. Recently we have attempted a quantification of the first order influence that eustatic sea-level change exert on the oceanic nutrient inventory, marine productivity and burial of organic carbon under greenhouse conditions (Bjerrum et al., 2006). In additions the process relations governing the clinoforms are investigated with our novel dynamic biogeochemical-stratigraphic model which explicitly calculates sediment and biogeochemical tracer erosion and deposition over multi-kilo-years. In the model organic and uranium enrichment in the distal clinoform develops as a transgressive nature. As a result part of the sedimentary characteristics, traditionally interpreted as a maximum flooding surface, forms during eustatic low stand near the clinoform toe and during sea-level high stand near the clinoform rollover. Such a response may be further modified when considering global carbon and nutrient cycles. Thus coupling the dynamic biogeochemical-stratigraphic models to our global carbon-nutrient cycle model will permit investigation of how marine productivity indicators and d13C can be use to refine the interpretations of submarine clinoform development and as correlation tools.

AB - An understanding of the processes-dynamics governing the development of submarine fine grained clinoforms relies often on correlation of proxies (grain-size trends, spectral gamma, microfossils, TOC, d13C etc.) to more proximal settings where relative sea-level changes are more easily detected. Recently we have attempted a quantification of the first order influence that eustatic sea-level change exert on the oceanic nutrient inventory, marine productivity and burial of organic carbon under greenhouse conditions (Bjerrum et al., 2006). In additions the process relations governing the clinoforms are investigated with our novel dynamic biogeochemical-stratigraphic model which explicitly calculates sediment and biogeochemical tracer erosion and deposition over multi-kilo-years. In the model organic and uranium enrichment in the distal clinoform develops as a transgressive nature. As a result part of the sedimentary characteristics, traditionally interpreted as a maximum flooding surface, forms during eustatic low stand near the clinoform toe and during sea-level high stand near the clinoform rollover. Such a response may be further modified when considering global carbon and nutrient cycles. Thus coupling the dynamic biogeochemical-stratigraphic models to our global carbon-nutrient cycle model will permit investigation of how marine productivity indicators and d13C can be use to refine the interpretations of submarine clinoform development and as correlation tools.

M3 - Conference abstract for conference

T2 - SEPM Research Conference

Y2 - 29 November 2010

ER -