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| DOI | 10.1029/2019GL086146 |
| The Enigma of Neoproterozoic Giant Ooids—Fingerprints of Extreme Climate? | |
| Trower E.J. | |
| 发表日期 | 2020 |
| ISSN | 0094-8276 |
| 卷号 | 47期号:4 |
| 英文摘要 | Geologists have documented at least 14 occurrences of “giant ooids,” a geologically rare type of carbonate allochem, in Neoproterozoic successions at low paleolatitudes. Recent experiments and modeling demonstrated that ooid size reflects an equilibrium between precipitation and abrasion rates, such that ooid size could be used as a geological proxy for CaCO3 mineral saturation state (Ω). Here, the documented sizes of Neoproterozoic giant ooids were applied to estimate seawater Ω, which provided a novel approach to constraining temperature, partial pressure of CO2, and alkalinity preceding Neoproterozoic glaciations. The results suggest that giant ooid formation was most plausible with seawater alkalinity elevated over its present value by at least a factor of 2, and either much warmer (40 °C) or much colder (0 °C) climate than modern tropical carbonate platforms, which have important and divergent implications for climate states and ecosystem responses prior to the initiation of each Neoproterozoic glaciation. © 2020. American Geophysical Union. All Rights Reserved. |
| 英文关键词 | Calcite; Calcium carbonate; pH; Seawater; Abrasion rates; Ecosystem response; Extreme climates; giant ooids; Mineral saturations; Neoproterozoic glaciations; Snowball Earth; Tropical carbonates; Glacial geology; alkalinity; carbon dioxide; extreme event; glaciation; ooid; paleolatitude; partial pressure; proxy climate record; saturation |
| 语种 | 英语 |
| 来源期刊 | Geophysical Research Letters
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/170659 |
| 作者单位 | Department of Geological Sciences, University of Colorado Boulder, Boulder, CO, United States |
| 推荐引用方式 GB/T 7714 | Trower E.J.. The Enigma of Neoproterozoic Giant Ooids—Fingerprints of Extreme Climate?[J],2020,47(4). |
| APA | Trower E.J..(2020).The Enigma of Neoproterozoic Giant Ooids—Fingerprints of Extreme Climate?.Geophysical Research Letters,47(4). |
| MLA | Trower E.J.."The Enigma of Neoproterozoic Giant Ooids—Fingerprints of Extreme Climate?".Geophysical Research Letters 47.4(2020). |
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