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This study explores the geological origins of life, suggesting early Earth

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Area of Science:

  • Geochemistry
  • Astrobiology
  • Mineralogy

Background:

  • The study of Earth's geological history and the conditions necessary for the emergence of life.
  • Exploration of hydrothermal systems, both modern and ancient, as potential cradles for early life.
  • Investigation of mineral catalysts and their role in prebiotic chemical reactions.

Purpose of the Study:

  • To investigate the role of geological processes, specifically hydrothermal activity, in the origin of life.
  • To explore the potential of mineral membranes in early Earth environments to facilitate prebiotic chemistry.
  • To understand the formation and significance of specific mineral formations like green rust in early Earth conditions.

Main Methods:

  • Field research in diverse geological settings including the Solomon Islands, Canada, Yukon, and Ireland.
  • Analysis of ore bodies, including lead-zinc (Pb-Zn) deposits and ophiolites.
  • Laboratory experiments simulating early Earth conditions to precipitate minerals and study their properties.

Main Results:

  • Identification of fossilized hydrothermal chimneys resembling chemical gardens, distinct from 'Black Smoker' types.
  • Observation that serpentinization processes in oceanic crust generate alkaline, hydrogen- and methane-rich waters.
  • Laboratory precipitates revealed green rust (fougèrite), a potential precursor to Archaean Banded Iron Formations and a candidate for life's base fractal.

Conclusions:

  • Hydrothermal systems, particularly alkaline ones, provided crucial chemical and physical conditions for life's emergence.
  • Mineral membranes, such as those formed by iron (Fe) and nickel (Ni) minerals, could have mediated essential prebiotic reactions.
  • Green rust (fougèrite) represents a tangible, early mineral formation with properties conducive to the origin of life.