Coupled microbial bloom and oxygenation decline recorded by magnetofossils during the Palaeocene-Eocene Thermal Maximum

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doi: 10.1038/s41467-018-06472-y
Author(s): Chang Liao; Harrison, Richard J.; Zeng Fan; Berndt, Thomas A.; Roberts, Andrew P.; Heslop, David; Zhao, Xiang
Author Affiliation(s): Primary:
Peking University, School of Earth and Space Sciences, Beijing, China
University of Cambridge, United Kingdom
Australian National University, Australia
Source: Nature Communications, 9( Article 4007), 9p. Publisher: Nature Publishing Group, London, United Kingdom. ISSN: 2041-1723
Note: In English. 70 refs.
Summary: Understanding marine environmental change and associated biological turnover across the Palaeocene-Eocene Thermal Maximum (PETM; ∼56 Ma)-the most pronounced Cenozoic short-term global warming event-is important because of the potential role of the ocean in atmospheric CO2 drawdown, yet proxies for tracing marine productivity and oxygenation across the PETM are limited and results remain controversial. Here we show that a high-resolution record of South Atlantic Ocean bottom water oxygenation can be extracted from exceptionally preserved magnetofossils-the bioinorganic magnetite nanocrystals produced by magnetotactic bacteria (MTB) using a new multiscale environmental magnetic approach. Our results suggest that a transient MTB bloom occurred due to increased nutrient supply. Bottom water oxygenation decreased gradually from the onset to the peak PETM. These observations provide a record of microbial response to the PETM and establish the value of magnetofossils as palaeoenvironmental indicators.
Year of Publication: 2018
Research Program: ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Atlantic Ocean; Bacteria; Carbon; Carbon cycle; Carbon dioxide; Cenozoic; Climate change; Climate effects; Data management; Geochemical cycle; Global change; Global warming; Information management; Leg 208; Magnetic properties; Marine environment; Nutrients; ODP Site 1263; Ocean Drilling Program; Paleo-oceanography; Paleocene-Eocene Thermal Maximum; Paleoclimatology; Paleoecology; Paleoenvironment; Paleogene; Paleomagnetism; Productivity; South Atlantic; Tertiary; Walvis Ridge
Coordinates: S283200 S283200 E0024700 E0024700
Record ID: 2019048004
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute.