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Nitrogen isotope evidence for expanded ocean suboxia in the early Cenozoic
Abstract.
"The million-year variability of the marine nitrogen cycle is poorly understood. Before 57 million years (Ma) ago, the 15N/14N ratio (δ15N) of foraminifera shell-bound organic matter from three sediment cores was high, indicating expanded water column suboxia and denitrification. [...]"
Source: Science
Authors: Emma R. Kast et al.
DOI: 10.1126/science.aau5784
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