DOI: 10.1016/j.epsl.2017.11.045
Scopus记录号: 2-s2.0-85037342930
论文题名: Nitrogen evolution within the Earth's atmosphere–mantle system assessed by recycling in subduction zones
作者: Mallik A. ; Li Y. ; Wiedenbeck M.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 482 起始页码: 556
结束页码: 566
语种: 英语
英文关键词: atmosphere–mantle evolution
; deep nitrogen cycling
; recycled volatiles
; solubility limit
; subduction zones
Scopus关键词: Isotopes
; Nitrogen
; Recycling
; Reservoirs (water)
; Solubility
; Structural geology
; Tectonics
; Isotopic composition
; Isotopic signatures
; Nitrogen cycling
; recycled volatiles
; Solubility limits
; Subduction zones
; Surface temperatures
; Volatile elements
; Earth atmosphere
; isotopic composition
; mantle
; nitrogen cycle
; parent body
; partitioning
; solubility
; subduction zone
英文摘要: Understanding the evolution of nitrogen (N) across Earth's history requires a comprehensive understanding of N's behaviour in the Earth's mantle – a massive reservoir of this volatile element. Investigation of terrestrial N systematics also requires assessment of its evolution in the Earth's atmosphere, especially to constrain the N content of the Archaean atmosphere, which potentially impacted water retention on the post-accretion Earth, potentially causing enough warming of surface temperatures for liquid water to exist. We estimated the proportion of recycled N in the Earth's mantle today, the isotopic composition of the primitive mantle, and the N content of the Archaean atmosphere based on the recycling rates of N in modern-day subduction zones. We have constrained recycling rates in modern-day subduction zones by focusing on the mechanism and efficiency of N transfer from the subducting slab to the sub-arc mantle by both aqueous fluids and slab partial melts. We also address the transfer of N by aqueous fluids as per the model of Li and Keppler (2014). For slab partial melts, we constrained the transfer of N in two ways – firstly, by an experimental study of the solubility limit of N in melt (which provides an upper estimate of N uptake by slab partial melts) and, secondly, by the partitioning of N between the slab and its partial melt. Globally, 45–74% of N introduced into the mantle by subduction enters the deep mantle past the arc magmatism filter, after taking into account the loss of N from the mantle by degassing at mid-ocean ridges, ocean islands and back-arcs. Although the majority of the N in the present-day mantle remains of primordial origin, our results point to a significant, albeit minor proportion of mantle N that is of recycled origin (17±8% or 12±5% of N in the present-day mantle has undergone recycling assuming that modern-style subduction was initiated 4 or 3 billion years ago, respectively). This proportion of recycled N is enough to cause a departure of N isotopic composition of the primitive mantle from today's δ15N of −5‰ to −6.8±0.9‰ or −6.3±1.2‰. Future studies of Earth's parent bodies based on the bulk Earth N isotopic signature should take into account these revised values for the δ15N composition of the primitive mantle. Also, the Archaean atmosphere had a N partial pressure of 1.4–1.6 times higher than today, which may have warmed the Earth's surface above freezing despite a faint young Sun. © 2017 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110122
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Bayerisches Geoinstitut, Universität Bayreuth, Bayreuth, 95440, Germany; State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510460, China; Helmholtz Zentrum Potsdam, Deutsches GeoForschungZentrum GFZ, Telegrafenberg, Potsdam, 14473, Germany
Recommended Citation:
Mallik A.,Li Y.,Wiedenbeck M.. Nitrogen evolution within the Earth's atmosphere–mantle system assessed by recycling in subduction zones[J]. Earth and Planetary Science Letters,2018-01-01,482