Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1038/NGEO3030 |
Earth's early O-2 cycle suppressed by primitive continents | |
Smit, Matthijs A.1; Mezger, Klaus2 | |
2017-10-01 | |
发表期刊 | NATURE GEOSCIENCE |
ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2017 |
卷号 | 10期号:10 |
文章类型 | Article |
语种 | 英语 |
国家 | Canada; Switzerland |
英文摘要 | Free oxygen began to accumulate in Earth's surface environments between 3.0 and 2.4 billion years ago. Links between oxygenation and changes in the composition of continental crust during this time are suspected, but have been difficult to demonstrate. Here we constrain the average composition of the exposed continental crust since 3.7 billion years ago by compiling records of the Cr/U ratio of terrigenous sediments. The resulting record is consistent with a predominantly mafic crust prior to 3.0 billion years ago, followed by a 500-to 700-million-year transition to a crust of modern andesitic composition. Olivine and other Mg-rich minerals in the mafic Archaean crust formed serpentine minerals upon hydration, continuously releasing O-2-scavenging agents such as dihydrogen, hydrogen sulfide and methane to the environment. Temporally, the decline in mafic crust capable of such process coincides with the first accumulation of O-2 in the oceans, and subsequently the atmosphere. We therefore suggest that Earth's early O-2 cycle was ultimately limited by the composition of the exposed upper crust, and remained underdeveloped until modern andesitic continents emerged. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000412102200018 |
WOS关键词 | BARBERTON GREENSTONE-BELT ; ATMOSPHERIC OXYGEN ; OXIDATION ; SERPENTINIZATION ; EVOLUTION ; OCEAN ; CRUST ; TRANSITION ; REDUCTION ; EMERGENCE |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
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/34990 |
专题 | 地球科学 气候变化 |
作者单位 | 1.Univ British Columbia, Dept Earth Ocean & Atmospher Sci, 2020-22017 Main Mall, Vancouver, BC V6T 1Z4, Canada; 2.Univ Bern, Inst Geol, Baltzerstr 1 3, CH-3012 Bern, Switzerland |
推荐引用方式 GB/T 7714 | Smit, Matthijs A.,Mezger, Klaus. Earth's early O-2 cycle suppressed by primitive continents[J]. NATURE GEOSCIENCE,2017,10(10). |
APA | Smit, Matthijs A.,&Mezger, Klaus.(2017).Earth's early O-2 cycle suppressed by primitive continents.NATURE GEOSCIENCE,10(10). |
MLA | Smit, Matthijs A.,et al."Earth's early O-2 cycle suppressed by primitive continents".NATURE GEOSCIENCE 10.10(2017). |
条目包含的文件 | 条目无相关文件。 |
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