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Updated: May 20, 2025

Simulation of Early Earth Hydrothermal Chimneys in a Thermal Gradient Environment
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Tectonics and Surface Environments on Early Earth.

Jun Korenaga1

  • 1Department of Earth and Planetary Sciences, Yale University, New Haven, Connecticut, USA.

Astrobiology
|March 26, 2025
PubMed
Summary

Early Earth

Area of Science:

  • Geosciences
  • Planetary Science
  • Astrobiology

Background:

  • The tectonic regime of the early Earth is debated, impacting our understanding of early life's origins.
  • Most research suggests plate tectonics began around the mid-Archean (3 Ga), with stagnant lid convection dominating earlier.
  • The geological record is equivocal, lacking a clear preference for stagnant lid over plate tectonics.

Purpose of the Study:

  • To investigate the timing and implications of early Earth's tectonic modes.
  • To assess the influence of different tectonic regimes on the potential for abiogenesis.

Main Methods:

  • Review and analysis of existing geological and theoretical models of early Earth tectonics.
  • Comparative analysis of stagnant lid convection versus plate tectonics in the context of early habitability.
Keywords:
Plate tectonics—Stagnant lid convection—Early atmosphere—Early ocean—Continents

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Main Results:

  • The geological evidence for early Earth's tectonic mode is inconclusive.
  • A delayed onset of plate tectonics would hinder, not promote, the emergence of life.
  • Rapid early Hadean plate tectonics, following magma ocean crystallization, could foster habitable conditions.

Conclusions:

  • Plate tectonics likely operated much earlier than commonly assumed, possibly in the Hadean.
  • Early plate tectonics provided crucial surface environments conducive to the origin of life (abiogenesis).
  • Rethinking early Earth's tectonic history is essential for understanding life's emergence.