Journal
ELEMENTS
Volume 9, Issue 5, Pages 345-351Publisher
MINERALOGICAL SOC AMER
DOI: 10.2113/gselements.9.5.345
Keywords
Precambrian; biogeochemistry; nitrogen isotope; nitrogen cycle; early life
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Funding
- Universite de Bourgogne FABER program (France)
- Institut de Sciences de l'Univers (CNRS, France)
- NASA Astrobiology Institute [NNA04CC09A]
- NASA Early Career Fellowship Program [NNX12AG14G]
- NAI-DDF Program [NNA09DA81A]
- Carnegie Institution for Science, Boston College
- China University of Geoscience
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Variations in the nitrogen isotope composition of ancient organic matter and associated sediments provide clues for the early evolution of Earth's atmosphere-ocean-biosphere system. In particular, large isotopic variations have been linked to the protracted oxygenation of Earth's atmosphere during the Precambrian. Important problems being investigated include the nature of the variations observed at specific times in Earth's history and the degree of preservation of ancient nitrogen biogeochemical signatures during diagenesis and metamorphism. Interpreting these records in Archean sedimentary environments and their possible implications for the evolution of Earth's early atmosphere, ocean, and life is challenging.
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