DOI: 10.1016/j.epsl.2018.08.007
Scopus记录号: 2-s2.0-85051625682
论文题名: Pervasive aerobic nitrogen cycling in the surface ocean across the Paleoproterozoic Era
作者: Kipp M.A. ; Stüeken E.E. ; Yun M. ; Bekker A. ; Buick R.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 500 起始页码: 117
结束页码: 126
语种: 英语
英文关键词: eukaryote evolution
; Great Oxidation Event
; Lomagundi Event
; nitrogen isotopes
; Paleoproterozoic
; paleoredox
Scopus关键词: Biochemistry
; Geochronology
; Isotopes
; Nitrates
; Nutrients
; Sedimentary rocks
; Sedimentology
; eukaryote evolution
; Great Oxidation Event
; Lomagundi Event
; Nitrogen isotopes
; Paleoproterozoic
; paleoredox
; Nitrogen
; eukaryote
; nitrogen cycle
; organic carbon
; oxic conditions
; oxygenation
; paleoceanography
; paleoclimate
; Proterozoic
; proxy climate record
; sedimentary rock
; Eukaryota
英文摘要: Nitrogen isotope ratios in marine sedimentary rocks have become a widely used biogeochemical proxy that records information about nutrient cycling and redox conditions in Earth's distant past. While the past two decades have seen considerable progress in our understanding of the Precambrian sedimentary nitrogen isotope record, it is still compromised by substantial temporal gaps. Furthermore, quantitative links between nitrogen isotope data, marine redox conditions, and nutrient availability are largely lacking in a Precambrian context. Here we present new nitrogen isotope data from a suite of marine sedimentary rocks with ca. 2.4 to 1.8 Ga ages, spanning the Great Oxidation Event in the Paleoproterozoic, to better constrain the response of the nitrogen cycle to the first major redox transition in Earth's history. We further construct a simple box model to describe the major pathways that influenced the nitrogen isotope mass balance of the Precambrian ocean and use this as a platform to evaluate the Precambrian nitrogen isotope record. Within this framework, we find that consistently positive nitrogen isotope values, ranging from +1.1 to +7.7‰ across the early Paleoproterozoic are strong evidence for an expansion of oxygenated surface waters. Since the isotopic signature of aerobic nitrogen cycling is recorded in the biomass of nitrate-assimilating organisms, this implicates widespread nitrate bioavailability in this time interval. The decline in offshore nitrogen isotope ratios in the Mesoproterozoic is consistent with the contraction of oxic waters, which could have inhibited the expansion of nitrate-fueled ecosystems to pelagic waters until the widespread oxygenation of the ocean in the latest Neoproterozoic to early Phanerozoic. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109697
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: Department of Earth & Space Sciences and Astrobiology Program, University of Washington, Seattle, WA 98195, United States; Virtual Planetary Laboratory, NASA Astrobiology Institute, Seattle, WA 98195, United States; School of Earth & Environmental Sciences, University of St. AndrewsScotland KY16 9AL, United Kingdom; Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba R3G 2K4, Canada; Department of Earth Sciences, University of California, Riverside, CA 92521, United States; Department of Geology, University of Johannesburg, P.O. Box 524, Auckland Park2006, South Africa
Recommended Citation:
Kipp M.A.,Stüeken E.E.,Yun M.,et al. Pervasive aerobic nitrogen cycling in the surface ocean across the Paleoproterozoic Era[J]. Earth and Planetary Science Letters,2018-01-01,500