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Seeking a geochemical identifier for authigenic carbonate.

Ming-Yu Zhao1, Yong-Fei Zheng1, Yan-Yan Zhao1

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Authigenic carbonate, a newly identified carbon sink, can be distinguished from marine carbonate using uranium and carbon isotopes. Its increased formation in the Early Triassic helped regulate atmospheric CO2.

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Area of Science:

  • Geochemistry
  • Paleoclimatology
  • Carbon Cycle Research

Background:

  • Authigenic carbonate is proposed as a significant global carbon sink alongside marine and organic carbon.
  • Differentiating authigenic and primary marine carbonate is crucial for understanding Earth's carbon cycle and atmospheric oxygen regulation.

Purpose of the Study:

  • To develop a method for distinguishing between authigenic and primary marine carbonate sinks.
  • To investigate the role of authigenic carbonate formation during the Early Triassic period.

Main Methods:

  • Microscale geochemical measurements of carbonates.
  • Analysis of uranium concentration and carbon isotope composition.
  • Cross-plot analysis to differentiate carbonate types.

Main Results:

  • Authigenic carbonate exhibits a distinct geochemical signature compared to primary marine carbonate.
  • A combination of uranium concentration and carbon isotope data successfully distinguishes the two carbonate sinks.
  • Authigenic carbonate formation increased during the Early Triassic.

Conclusions:

  • Geochemical analysis provides a reliable method to differentiate authigenic and primary marine carbonate.
  • The rise in authigenic carbonate formation during the Early Triassic likely served as a negative feedback mechanism against high atmospheric CO2 levels.