DOI: 10.1016/j.earscirev.2021.103560
论文题名: Atmospheric oxygen of the Paleozoic
作者: Brand U. ; Davis A.M. ; Shaver K.K. ; Blamey N.J.F. ; Heizler M. ; Lécuyer C.
刊名: Earth Science Reviews
ISSN: 00128252
出版年: 2021
卷: 216 语种: 英语
中文关键词: Direct and indirect proxies
; Fluid inclusions
; Halite
; Mass spectrometry
; Paleozoic
; pO2 measurements
; Relatively constant atmospheric oxygen
英文关键词: fluid inclusion
; halite
; mass spectrometry
; oxygen
; paleoatmosphere
; Paleozoic
英文摘要: The evolution of Earth's atmosphere is of extreme importance to the lithosphere, hydrosphere and biosphere. This is particularly true for the role the biosphere played in the inceptual formation of atmospheric oxygen, and subsequently in its potential role in the evolution of higher life forms. Quantifying the change in atmospheric oxygen with geologic time is extremely challenging, with the redox sensitive isotope and element models subject to contradictory outcomes. Here, we present a new approach in determining past atmospheres, by a) directly measuring (DM) the amount of atmospheric oxygen trapped in fluid-gas inclusions of primary and unaltered halite, and by b) using a back-calculation method (BCM) applied to trapped halite fluid inclusion gas contents subjected to post-depositional biogeochemical reactions to calculate the amount of atmospheric oxygen. On average (±standard error), atmospheric oxygen content during the latest Ediacaran was 17.4 ± 2.1% compiled from DM of 17.4 ± 1.3% and from BCM of 17.3 ± 2.9%. For the earliest Cambrian average oxygen was 19.3 ± 1.4% compiled from DM of 18.8 ± 1.5% and from BCM of 19.8 ± 1.3%. The oxygen content during the mid and late Ordovician was relatively invariant with 15.6 ± 1.8% [15.4 ± 1.4% (DM), 15.8 ± 2.2% (BCM)], and 16.2 ± 1.2% [15.7 ± 1.7% (DM), 16.6 ± 0.7% (BCM)], respectively. The relatively stable atmospheric oxygen levels continued into the Silurian of 15.9 ± 1.1% (12.9 ± 0.4 to 16.5%, DM; 14.3 ± 1.7 to 19.8 ± 2.1% BCM) except for a peak to about present levels during the late Silurian of 23.2 ± 1.9% (21.6% DM, 24.7 ± 3.7% BCM). Early Carboniferous atmospheric oxygen returned to relatively lower and invariant levels at about 15.3 ± 0.7 to 15.7 ± 1.0% (15.0%, 15.5 ± 0.1% DM, 9.4 ± 3.9 to 15.8 ± 1.9% BCM). Similarly, the average atmospheric oxygen content in fluid inclusion of halites from the late Permian was similar with 15.7 ± 1.3% with 16.9% (DM) to 14.5 ± 2.6% (BCM). Indeed, our study suggests that atmospheric oxygen was relatively constant for most of the Paleozoic at about 16.5% (±0.6 SE, ±2.2 SD). This puts our proxy result at odds with the values and trends suggested by the COPSE, GEOCARBSULF AND GEOCARBSULFOR models for the early Paleozoic atmospheric oxygen, and continues the discord with the GEOCARBSULF and GEOCARBULFOR models during the late Paleozoic. © 2021 The Author(s) Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/166345
Appears in Collections: 气候变化与战略
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作者单位: Department of Earth Sciences, Brock University, 1812 Sir Isaac Brock Way, St. Catharines, ON L2S 3A1, Canada; Department of Earth Sciences, University of Western Ontario, 1151 Richmond Street, London, ON N6A 5B7, Canada; Department of Earth and Environmental Science, New Mexico Institute of Mining and Technology, 801 Leroy Place, Socorro, NM 87801, United States; Laboratoire de Géologie de Lyon “Terre, Planètes Environnement”, CNRS UMR 5276, Université Claude Bernard Lyon 1, Ecole Normale Supérieure de Lyon, Campus de la Doua, Villeurbanne, F-69622, France
Recommended Citation:
Brand U.,Davis A.M.,Shaver K.K.,et al. Atmospheric oxygen of the Paleozoic[J]. Earth Science Reviews,2021-01-01,216