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| DOI | 10.1111/gbi.12359 |
| Global marine redox changes drove the rise and fall of the Ediacara biota | |
| Zhang F.; Xiao S.; Romaniello S.J.; Hardisty D.; Li C.; Melezhik V.; Pokrovsky B.; Cheng M.; Shi W.; Lenton T.M.; Anbar A.D. | |
| 发表日期 | 2019 |
| ISSN | 14724677 |
| 起始页码 | 594 |
| 结束页码 | 610 |
| 卷号 | 17期号:6 |
| 英文摘要 | The role of O2 in the evolution of early animals, as represented by some members of the Ediacara biota, has been heavily debated because current geochemical evidence paints a conflicting picture regarding global marine O2 levels during key intervals of the rise and fall of the Ediacara biota. Fossil evidence indicates that the diversification the Ediacara biota occurred during or shortly after the Ediacaran Shuram negative C-isotope Excursion (SE), which is often interpreted to reflect ocean oxygenation. However, there is conflicting evidence regarding ocean oxygen levels during the SE and the middle Ediacaran Period. To help resolve this debate, we examined U isotope variations (δ238U) in three carbonate sections from South China, Siberia, and USA that record the SE. The δ238U data from all three sections are in excellent agreement and reveal the largest positive shift in δ238U ever reported in the geologic record (from ~ −0.74‰ to ~ −0.26‰). Quantitative modeling of these data suggests that the global ocean switched from a largely anoxic state (26%–100% of the seafloor overlain by anoxic waters) to near-modern levels of ocean oxygenation during the SE. This episode of ocean oxygenation is broadly coincident with the rise of the Ediacara biota. Following this initial radiation, the Ediacara biota persisted until the terminal Ediacaran period, when recently published U isotope data indicate a return to more widespread ocean anoxia. Taken together, it appears that global marine redox changes drove the rise and fall of the Ediacara biota. © 2019 John Wiley & Sons Ltd |
| 关键词 | biotacarbon isotopeEdiacaranfossil recordglobal oceanoxygenationpaleoceanographyProterozoicseaflooruranium isotopeChinaSiberiaUnited StatesAnimaliaoxygensea wateruraniumUranium-238biotachemistryChinaoxidation reduction reactionpaleontologyRussian FederationseasedimentUnited StatesBiotaChinaGeologic SedimentsOceans and SeasOxidation-ReductionOxygenPaleontologySeawaterSiberiaUnited StatesUranium |
| 语种 | 英语 |
| 来源机构 | Geobiology |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/133217 |
| 推荐引用方式 GB/T 7714 | Zhang F.,Xiao S.,Romaniello S.J.,et al. Global marine redox changes drove the rise and fall of the Ediacara biota[J]. Geobiology,2019,17(6). |
| APA | Zhang F..,Xiao S..,Romaniello S.J..,Hardisty D..,Li C..,...&Anbar A.D..(2019).Global marine redox changes drove the rise and fall of the Ediacara biota.,17(6). |
| MLA | Zhang F.,et al."Global marine redox changes drove the rise and fall of the Ediacara biota".17.6(2019). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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