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Research article 25 Jul Although climate change during the PETM is relatively well constrained, effects on marine oxygen concentrations and nutrient cycling remain largely unclear. Vegetation changes, as recorded from pollen assemblages, support this warming.
The PETM is bracketed by two unconformities. It overlies Paleocene silt- and mudstones and is rich in angular thus in situ produced; autochthonous glauconite grains, which indicate sedimentary condensation.
A drop in the relative abundance of terrestrial organic matter and changes in the dinoflagellate cyst assemblages suggest that rising sea level shifted the deposition of terrigenous material landward.
This is consistent with previous findings of eustatic sea level rise during the PETM. Regionally, the attribution of the glauconite-rich unit to the PETM implicates the dating of a primate fossil, argued to represent the oldest North American specimen on record.
The biomarker isorenieratene within the PETM indicates that euxinic photic zone conditions developed, likely seasonally, along the Gulf Coastal Plain. A global data compilation indicates that O 2 concentrations dropped in all ocean basins in response to warming, hydrological change, and carbon cycle feedbacks.
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This culminated in seasonal anoxia along many continental margins, analogous to modern trends. Seafloor deoxygenation and widespread seasonal anoxia likely caused phosphorus regeneration from suboxic and anoxic sediments. We argue that this fueled shelf eutrophication, as widely recorded from microfossil studies, increasing organic carbon burial along many continental margins as a negative feedback to carbon input and global warming. If properly quantified with future work, the PETM offers the opportunity to assess the biogeochemical effects of woondienaten phosphorus regeneration, as well as the woondiennsten on which this feedback operates in view of modern and future ocean deoxygenation.
Climate of the Past.
Geoscientific Instrumentation, Methods and Data Systems. Hydrology and Earth System Sciences.
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Natural Hazards and Earth System Sciences. Nonlinear Processes in Geophysics. Author Title Abstract Full doondiensten. Journal metrics Journal metrics IF 3. Volume 10, issue 4.
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