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Updated: Apr 12, 2026

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High Molybdenum availability for evolution in a Mesoproterozoic lacustrine environment.

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Molybdenum availability in Mesoproterozoic lakes was significantly higher than in oceans, supporting early life evolution. This contrasts with nutrient-limited oceans, suggesting terrestrial environments were key for early life development.

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Area of Science:

  • Geochemistry
  • Paleobiology
  • Environmental Science

Background:

  • Proterozoic marine euxinic sediments suggest limited bioessential metal availability (e.g., molybdenum) delayed cyanobacteria and eukaryotic evolution.
  • Recent findings indicate Mesoproterozoic life evolution may have occurred in lakes and terrestrial settings, not just the deep ocean.

Purpose of the Study:

  • To assess molybdenum availability in Mesoproterozoic lacustrine environments.
  • To understand the role of molybdenum in supporting early life evolution in terrestrial settings.

Main Methods:

  • Analysis of trace metal data from Proterozoic marine sediments.
  • Geochemical assessment of molybdenum flux to a Mesoproterozoic lake environment.

Main Results:

  • Molybdenum flux to a Mesoproterozoic lake was 1-2 orders of magnitude higher than in marine environments.
  • This high molybdenum availability in lakes contrasts with nutrient-limited Mesoproterozoic oceans.

Conclusions:

  • High molybdenum availability in Mesoproterozoic lakes removed a barrier to evolution.
  • Terrestrial and lacustrine environments, rather than oceans, likely facilitated early nitrogen fixation and eukaryotic diversification.