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DOI | 10.1073/pnas.1619527114 |
Redox variations in Mauna Kea lavas, the oxygen fugacity of the Hawaiian plume, and the role of volcanic gases in Earth's oxygenation | |
Brounce, Maryjo1,2; Stolper, Edward1; Eiler, John1 | |
2017-08-22 | |
发表期刊 | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA |
ISSN | 0027-8424 |
出版年 | 2017 |
卷号 | 114期号:34页码:8997-9002 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | The behavior of C, H, and S in the solid Earth depends on their oxidation states, which are related to oxygen fugacity (fO(2)). Volcanic degassing is a source of these elements to Earth's surface; therefore, variations in mantle fO(2) may influence the fO(2) at Earth's surface. However, degassing can impact magmatic fO(2) before or during eruption, potentially obscuring relationships between the fO(2) of the solid Earth and of emitted gases and their impact on surface fO(2). We show that low-pressure degassing resulted in reduction of the fO(2) of Mauna Kea magmas by more than an order of magnitude. The least degassed magmas from Mauna Kea are more oxidized than midocean ridge basalt (MORB) magmas, suggesting that the upper mantle sources of Hawaiian magmas have higher fO(2) than MORB sources. One explanation for this difference is recycling of material from the oxidized surface to the deep mantle, which is then returned to the surface as a component of buoyant plumes. It has been proposed that a decreasing pressure of volcanic eruptions led to the oxygenation of the atmosphere. Extension of our findings via modeling of degassing trends suggests that a decrease in eruption pressure would not produce this effect. If degassing of basalts were responsible for the rise in oxygen, it requires that Archean magmas had at least two orders of magnitude lower fO(2) than modern magmas. Estimates of fO(2) of Archean magmas are not this low, arguing for alternative explanations for the oxygenation of the atmosphere. |
英文关键词 | ocean island basalts oxygen fugacity Hawaii volcanism volcanic degassing Great Oxidation Event |
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:000408095300043 |
WOS关键词 | OXIDATION-STATE ; BASALTIC MAGMAS ; SILICATE MELTS ; MANTLE PLUMES ; EVOLUTION ; GLASSES ; SULFUR ; FE ; DIFFERENTIATION ; FE3+/SIGMA-FE |
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/204768 |
专题 | 地球科学 资源环境科学 气候变化 |
作者单位 | 1.CALTECH, Div Geol & Planetary Sci, Pasadena, CA 91125 USA; 2.Univ Calif Riverside, Dept Earth Sci, Riverside, CA 92521 USA |
推荐引用方式 GB/T 7714 | Brounce, Maryjo,Stolper, Edward,Eiler, John. Redox variations in Mauna Kea lavas, the oxygen fugacity of the Hawaiian plume, and the role of volcanic gases in Earth's oxygenation[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2017,114(34):8997-9002. |
APA | Brounce, Maryjo,Stolper, Edward,&Eiler, John.(2017).Redox variations in Mauna Kea lavas, the oxygen fugacity of the Hawaiian plume, and the role of volcanic gases in Earth's oxygenation.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,114(34),8997-9002. |
MLA | Brounce, Maryjo,et al."Redox variations in Mauna Kea lavas, the oxygen fugacity of the Hawaiian plume, and the role of volcanic gases in Earth's oxygenation".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 114.34(2017):8997-9002. |
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