Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1073/pnas.1806216115 |
Constraints on Paleoproterozoic atmospheric oxygen levels | |
Bellefroid, Eric J.1; Hood, Ashleigh V. S.1; Hoffman, Paul F.2; Thomas, Matthew D.1; Reinhard, Christopher T.3,4; Planavsky, Noah J.1,4 | |
2018-08-07 | |
发表期刊 | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA |
ISSN | 0027-8424 |
出版年 | 2018 |
卷号 | 115期号:32页码:8104-8109 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Canada |
英文摘要 | The oxygenation of Earth's surface environment dramatically altered key biological and geochemical cycles and ultimately ushered in the rise of an ecologically diverse biosphere. However, atmospheric oxygen partial pressures (pO(2)) estimates for large swaths of the Precambrian remain intensely debated. Here we evaluate and explore the use of carbonate cerium (Ce) anomalies (Ce/Ce*) as a quantitative atmospheric pO(2) proxy and provide estimates of Proterozoic pO(2) using marine carbonates from a unique Precambrian carbonate succession-the Paleoproterozoic Pethei Group. In contrast to most previous work, we measure Ce/Ce* on marine carbonate precipitates that formed in situ across a depth gradient, building on previous detailed sedimentology and stratigraphy to constrain the paleo-depth of each sample. Measuring Ce/Ce* across a full platform to basin depth gradient, we found only minor depleted Ce anomalies restricted to the platform and upper slope facies. We combine these results with a Ce oxidation model to provide a quantitative constraint on atmospheric pO(2) 1.87 billion years ago (Ga). Our results suggest. Paleoproterozoic atmospheric oxygen concentrations were low, near 0.1% of the present atmospheric level. This work provides another crucial line of empirical evidence that atmospheric oxygen levels returned to low concentrations following the Lomagundi Event, and remained low enough for large portions of the Proterozoic to have impacted the ecology of the earliest complex organisms. |
英文关键词 | Ce anomalies rare earth elements oxygenation Ce oxidation Proterozoic |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000440982000037 |
WOS关键词 | GREAT-SLAVE-LAKE ; RARE-EARTH-ELEMENTS ; PROTEROZOIC FORELAND BASIN ; PETHEI GROUP ; EAST ARM ; CARBONATE PLATFORM ; REEFAL CARBONATES ; CHROMIUM ISOTOPES ; NORTHWEST CANADA ; SHALLOW SEAWATER |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/204960 |
专题 | 地球科学 资源环境科学 气候变化 |
作者单位 | 1.Yale Univ, Dept Geol & Geophys, POB 6666, New Haven, CT 06511 USA; 2.Univ Victoria, Sch Earth & Ocean Sci, Victoria, BC V8P 3E6, Canada; 3.Georgia Tech, Sch Earth & Atmospher Sci, Atlanta, GA 30332 USA; 4.Univ Calif Riverside, NASA, Astrobiol Inst Alternat Earths Team, Riverside, CA 92521 USA |
推荐引用方式 GB/T 7714 | Bellefroid, Eric J.,Hood, Ashleigh V. S.,Hoffman, Paul F.,et al. Constraints on Paleoproterozoic atmospheric oxygen levels[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2018,115(32):8104-8109. |
APA | Bellefroid, Eric J.,Hood, Ashleigh V. S.,Hoffman, Paul F.,Thomas, Matthew D.,Reinhard, Christopher T.,&Planavsky, Noah J..(2018).Constraints on Paleoproterozoic atmospheric oxygen levels.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,115(32),8104-8109. |
MLA | Bellefroid, Eric J.,et al."Constraints on Paleoproterozoic atmospheric oxygen levels".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 115.32(2018):8104-8109. |
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