DOI: 10.1016/j.epsl.2020.116417
论文题名: Toarcian climate and carbon cycle perturbations – its impact on sea-level changes, enhanced mobilization and oxidation of fossil organic matter
作者: Ruebsam W. ; Pieńkowski G. ; Schwark L.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 546 语种: 英语
中文关键词: global warming
; hydrological cycle
; organic matter provenance
; organic matter recycling
; Toarcian Oceanic Anoxic Event
英文关键词: Biogeochemistry
; Carbon
; Erosion
; Isotopes
; Organic compounds
; Submarine geology
; Weathering
; Carbon isotope excursions
; Environmental conditions
; Fossil organic matters
; Intermittent connections
; Oceanic Anoxic Event
; Organic geochemistry
; Sea-level fluctuations
; Terrestrial organic matter
; Sea level
; carbon cycle
; element mobility
; fossil
; mobilization
; organic geochemistry
; organic matter
; oxidation
; paleoceanography
; paleoclimate
; palynology
; perturbation
; sea level change
; Toarcian
; Poland [Central Europe]
英文摘要: Organic geochemistry and palynology reveal major organofacies changes in the marginal marine Polish Basin during the early Toarcian linked to changes in environmental conditions. Increasing water salinity and enhanced biomass contributions from phytoplankton, adopted to brackish conditions, attest to periodic marine ingressions into the paralic, hyposaline Polish Basin. Marine ingressions occurred upon reoccurring sea level rises concomitant with i) the Pliensbachian-Toarcian boundary carbon isotope excursion (Pl-Toa-CIE) and ii) the stepped Toarcian carbon isotope excursion (Toa-CIE), the latter marking the Toarcian Oceanic Anoxic Event (Toa-OAE). Strata with marine influences indicate an intermittent connection of the Polish Basin with the Tethys and attest to a close correlation between regional shoreline progradation and evolution of global climate and sea-level. Organic geochemistry indicated the link between sea level fluctuations and the Toa-CIEs, although in some areas of the Polish Basin the sea level rise was balanced by massively increased sediment delivery, caused by enhanced hydrological cycling that lead to intensified weathering and erosion in the hinterland. Enhanced hydrological cycling further led to the remobilization of organic matter of pre-Toarcian age. This points to erosion of older organic-rich rocks containing significant abundances of marine and terrestrial organic matter that was partly oxidized and re-deposited along with autochthonous Toarcian organic matter. Provenance areas identified point to two main sources, most likely Carboniferous terrestrial/paralic and Ordovician/Silurian marine sediments. Fossil organic matter should be considered as additional source in Toarcian carbon cycling, particularly in times of enhanced hydrological cycling, erosion and weathering. Remobilization of sedimentary fossil carbon has not been hitherto considered as a carbon source during the Toa-OAE. © 2020 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165247
Appears in Collections: 气候变化与战略
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作者单位: Department of Organic and Isotope Geochemistry, Institute of Geoscience, University of Kiel, Germany; Polish Geological Institute, National Research Institute, Warszawa, Poland; WA-OIGC, Curtin University, Perth, Australia
Recommended Citation:
Ruebsam W.,Pieńkowski G.,Schwark L.. Toarcian climate and carbon cycle perturbations – its impact on sea-level changes, enhanced mobilization and oxidation of fossil organic matter[J]. Earth and Planetary Science Letters,2020-01-01,546