A prominent oxygenation event in the late Mesoproterozoic broke the calm of the second half of the "Boring Billion"
文献类型：期刊论文
| 作者 | Meng, Lin4,5,6; Shi, Xiaoying3,5,6; Zhou, Limin2; Li, Jie1 ; Liu, Wei2; Xie, Baozeng4; Sun, Longfei3; Xu, Dongtao3; Xu, Lei4; Wang, Xinqiang3,6
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| 刊名 | PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
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| 出版日期 | 2025-03-15 |
| 卷号 | 662页码:13 |
| 关键词 | Ce anomaly Mo isotope Taizi Formation Yemahe Formation South China I/(Ca plus Mg) |
| ISSN号 | 0031-0182 |
| DOI | 10.1016/j.palaeo.2025.112752 |
| 英文摘要 | The redox conditions on Earth's surface during the so-called "Boring Billion" (ca. 1.8-0.8 Ga) were characterized by an overall low-oxygen background punctuated by pulsed oxygenation events. This viewpoint, however, is primarily based on the redox studies from the first half of the "Boring Billion". Therefore, it remains unclear whether this state continued into the second half. To address this issue, carbonate rocks from the ca. 1.25-1.22 Ga Taizi and Yemahe formations in the Shennongjia area, Yangtze Block, South China, were analyzed using integrated methods. The carbonate rocks in the upper Taizi Formation display persistent and significant negative Ce anomalies (0.50 +/- 0.05, n = 46) and relatively high I/(Ca + Mg) ratios (up to 1.28 mu mol/mol), whereas those from the Yemahe Formation show no negative Ce anomalies (0.99 +/- 0.21, n = 39) and low I/(Ca + Mg) ratios (0.03 +/- 0.04 mu mol/mol, n = 86). These data suggest the occurrence of a significant pulsed oxygenation event in shallow seawater during the deposition of the upper Taizi Formation. A model calculation shows that the shallow seawater oxygen concentrations may have reached up to 41 mu M, accompanied with a rise in atmospheric oxygen levels to 12% PAL (present atmospheric level). In contrast, the reconstructed seawater delta 98Mo value is +1.15 parts per thousand for this interval, lower than that of the modern seawater but similar to those of most mid-Proterozoic values, indicating the global seafloor largely remained anoxic. These findings indicate that the ocean redox state in the second half of the "Boring Billion" was more dynamic than previously thought. |
| WOS研究方向 | Physical Geography ; Geology ; Paleontology |
| 语种 | 英语 |
| WOS记录号 | WOS:001410003200001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/82633]  |
| 专题 | 同位素地球化学国家重点实验室 |
| 通讯作者 | Tang, Dongjie |
| 作者单位 | 1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China 2.Natl Res Ctr Geoanal, Beijing 100037, Peoples R China 3.China Univ Geosci Beijing, Sch Earth Sci & Resources, Beijing 100083, Peoples R China 4.China Univ Geosci Beijing, Inst Earth Sci, Beijing 100083, Peoples R China 5.China Univ Geosci Beijing, Frontiers Sci Ctr Deep Time Digital Earth, Beijing 100083, Peoples R China 6.China Univ Geosci Beijing, State Key Lab Geomicrobiol & Environm Changes, Beijing 100083, Peoples R China |
| 推荐引用方式 GB/T 7714 | Meng, Lin,Shi, Xiaoying,Zhou, Limin,et al. A prominent oxygenation event in the late Mesoproterozoic broke the calm of the second half of the "Boring Billion"[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2025,662:13. |
| APA | Meng, Lin.,Shi, Xiaoying.,Zhou, Limin.,Li, Jie.,Liu, Wei.,...&Tang, Dongjie.(2025).A prominent oxygenation event in the late Mesoproterozoic broke the calm of the second half of the "Boring Billion".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,662,13. |
| MLA | Meng, Lin,et al."A prominent oxygenation event in the late Mesoproterozoic broke the calm of the second half of the "Boring Billion"".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 662(2025):13. |
入库方式： OAI收割
来源：广州地球化学研究所
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