期刊
GEOLOGY
卷 32, 期 10, 页码 853-856出版社
GEOLOGICAL SOC AMERICA, INC
DOI: 10.1130/G20458.1
关键词
cyanobacteria; nitrogen fixation; oceanic anoxic event; denitrification; anammox; black shales; paleoceanography
类别
The abundance of specific membrane lipids, 2-methylhopanoids, indicates that cyanobacteria played a key role in the seemingly global deposition of black shales during the early Aptian (ca. 120.5 Ma) and late Cenomanian (ca. 93.5 Ma) oceanic anoxic events. Organic matter-rich sediments deposited during these events are characterized by a N-15 content typical of newly fixed N-2, indicating that cyanobacterial N-2 fixation was the main source for nutrient N. We propose that denitrification and anaerobic ammonium oxidation effectively cut off the return of nutrient N from the anoxic deep waters to the photic zone in the oceans, giving N-2-fixing cyanobacteria a competitive advantage over algae during these oceanic anoxic events.
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