Molybdenum isotope evidence from restricted-basin mudstones for an intermediate extent of oxygenation in the late Ediacaran ocean

Tan, Zhaozhao; Wu, Jianfeng; Jia, Wanglu; Li, Jie; Kendall, Brian; Song, Jianzhong; Peng, Ping’an

doi:10.1016/j.chemgeo.2023.121410

Cited by 5 publications

(1 citation statement)

References 115 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Especially, regression lines in the δ 98 Mo‒V EF and δ 98 Mo‒V/Mo plots are characterized by basically the same intercept δ 98 Mo value (∼+1.95‰) on the y axis (Figures 2c‒d). Thereby, it is suggested that the maximum seawater δ 98 Mo could be ∼+1.95‰ during the main stage of the Cambrian Age 4 (Tan et al., 2023), which is slightly higher than the marine δ 98 Mo value (+1.7‰) proposed by Cheng et al. (2017) for the Cambrian Age 3.…”

Section: Discussionmentioning

confidence: 86%

Mass Extinction Coincided With Expanded Continental Margin Euxinia During the Cambrian Age 4

Chang,

Hu,

Huang

et al. 2023

Geophysical Research Letters

View full text Add to dashboard Cite

Earth's biosphere witnessed the first major extinction event in the Phanerozoic during the Cambrian Age 4, with a genera loss up to ∼45%. The traditional view suggested that marine anoxia was the main cause of the biotic crisis, yet recent geochemical investigations yielded highly debated opinions on marine redox states during the Cambrian Age 4. Herein, we supplement new geochemical evidence for expanded marine euxinia at the extinction intervals on the Yangtze Platform, South China. Most importantly, modern‐level sedimentary δ98Mo (∼+2.34‰) records were most parsimoniously explained by transitory expansion of continental margin euxinia and concomitant intensification of sedimentary Mo sequestration via Fe‒Mn shuttles in the global ocean. The results clarify global marine redox conditions during the Cambrian Age 4, and lend firm support to a causal link between expanded marine euxinia and the extinction event.

show abstract

Section: Discussionmentioning

confidence: 86%