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Kohei Shimamura1, Fuyuki Shimojo, Aiichiro Nakano

  • 1Graduate School of System Informatics, Kobe University, 1-1 Rokkodai, Nada-ku, Kobe 657-8501, Japan. shimamura@port.kobe-u.ac.jp tanaka2@kobe-u.ac.jp.

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Meteorite impacts on early Earth oceans generated significant ammonia (NH3) through shock compression. Higher impact energies revealed multiple reaction pathways, strongly supporting ammonia

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Area of Science:

  • Planetary Science
  • Geochemistry
  • Astrobiology

Background:

  • Previous experiments suggested meteorite impacts on early Earth oceans produced ammonia (NH3) from atmospheric nitrogen (N2) and water (H2O) via reduction by meteoritic iron.
  • Initial simulations indicated rapid NH3 production during shock compression through an associative mechanism similar to nitrogenase enzymes.

Purpose of the Study:

  • To investigate NH3 production mechanisms under higher impact energies relevant to early Earth conditions.
  • To elucidate the reaction pathways contributing to ammonia synthesis during simulated meteorite impacts.

Main Methods:

  • Multi-scale shock technique (MSST) combined with ab initio molecular dynamics (AIMD) simulations.
  • Simulations utilized density functional theory (DFT) to model high-energy impact events.

Main Results:

  • Increased impact energies led to a significant rise in NH3 production.
  • Multiple reaction mechanisms were identified, including associative, dissociative (Haber-Bosch-like), and hydrazinium ion pathways.

Conclusions:

  • Higher energy meteorite impacts are more efficient producers of ammonia than previously thought.
  • The emergence of diverse reaction mechanisms strongly supports the role of shock-induced NH3 production in the origin of life on Earth.