@article{23c6ae2d8e654c8cb61c67b1143fd903,
title = "Intensified Ocean Deoxygenation During the end Devonian Mass Extinction",
abstract = "The end-Devonian mass extinction (~359 Ma) substantially impacted marine ecosystems and shaped the roots of modern vertebrate biodiversity. Although multiple hypotheses have been proposed, no consensus has been reached about the mechanism inducing this extinction event. In this study, I/Ca ratio of carbonate was used to unravel the changes in local oxygen content of the upper water column during this critical interval. The Devonian-Carboniferous boundary was recorded in two shallow water carbonate sections in south China. I/Ca values at both locations show a clear decline in the Middle and Upper Siphonodella praesulcata conodont zones, which coincides with a positive shift in carbonate carbon isotope composition and a negative shift in nitrogen isotope composition. These results suggest that deoxygenation was intensified during this critical interval, which likely influenced shallow water habitats, lending support to the notion that oxygen deficiency likely was a direct mechanism impacting the end-Devonian mass extinction.",
keywords = "Carboniferous, Devonian, Hangenberg mass extinction, I/Ca ratio, climatic cooling, deoxygenation",
author = "Jiangsi Liu and Genming Luo and Zunli Lu and Wanyi Lu and Wenkun Qie and Feifei Zhang and Xiangdong Wang and Shucheng Xie",
note = "Funding Information: This work was financially supported by the Strategic Priority Research Program of Chinese Academy of Sciences (grant XDB26000000), National Natural Science Foundation of China (grant 41821001), National Key R&D Project of China (grant 2016YFA0601104), and the China Scholarship Council Fund (File 201706410081). ZL acknowledges NSF EAR-1349252 and OCE-1736542. FF acknowledges support from a Danish Agency for Science, Technology and Innovation grant (No. DFF 7014-00295). The data accompanying this manuscript can be downloaded from EarthChem through https://doi.org/10.1594/IEDA/111449. The authors declare no conflict of interest. Funding Information: This work was financially supported by the Strategic Priority Research Program of Chinese Academy of Sciences (grant XDB26000000), National Natural Science Foundation of China (grant 41821001), National Key R&D Project of China (grant 2016YFA0601104), and the China Scholarship Council Fund (File 201706410081). ZL acknowledges NSF EAR‐1349252 and OCE‐1736542. FF acknowledges support from a Danish Agency for Science, Technology and Innovation grant (No. DFF 7014‐00295). The data accompanying this manuscript can be downloaded from EarthChem through https://doi.org/10.1594/IEDA/111449 . The authors declare no conflict of interest. Publisher Copyright: {\textcopyright}2019. American Geophysical Union. All Rights Reserved.",
year = "2019",
month = dec,
day = "1",
doi = "10.1029/2019GC008614",
language = "English (US)",
volume = "20",
pages = "6187--6198",
journal = "Geochemistry, Geophysics, Geosystems",
issn = "1525-2027",
publisher = "American Geophysical Union",
number = "12",
}