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Related Concept Videos

Redox Equilibria: Overview01:23

Redox Equilibria: Overview

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A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
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Ladder diagrams are useful tools for understanding redox equilibrium reactions, especially the effects of concentration changes on the electrochemical potential of the reaction. The vertical axis in the redox ladder diagrams represents the electrochemical potential, E. The area of predominance is demarcated using the Nernst equation.
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Updated: May 23, 2025

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Variable mantle redox states driven by deeply subducted carbon.

Mingdi Gao1, Yu Wang1, Stephen F Foley2,3

  • 1State Key Laboratory of Deep Earth Processes and Resources, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China.

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This summary is machine-generated.

Slab subduction drives mantle redox variations, influencing diamond formation. Carbonate melt reactions with metallic iron (Fe0) in the deep mantle create distinct reduced or oxidized conditions beneath cratons.

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Area of Science:

  • Geochemistry and Petrology
  • Deep Earth Processes
  • Craton Formation and Stability

Background:

  • Slab subduction introduces carbonates into the metallic iron (Fe0)-bearing sublithospheric mantle.
  • This process leads to heterogeneous mantle redox states and diamond formation beneath cratons.
  • Understanding mantle redox variation drivers is crucial for deep Earth processes.

Purpose of the Study:

  • To elucidate the drivers of mantle redox variation through experimental petrology.
  • To investigate the interaction between carbonatite melt and Fe0-bearing peridotite under high pressure and varying redox conditions.
  • To compare experimental results with natural diamond inclusions from different cratons.

Main Methods:

  • Performed mixed reaction experiments between carbonatite melt and Fe0-bearing peridotite.
  • Experiments were conducted at high pressures (9 to 21 gigapascals) and varying redox conditions.
  • Results were compared with analyses of majorite and ferropericlase inclusions from sublithospheric diamonds.

Main Results:

  • In nonplume environments, carbonatite melts are consumed, forming reduced carbon and enhancing craton stability.
  • In plume environments, melts overwhelm Fe0 buffering, creating oxidized, CO2-rich melts.
  • Diamond inclusions from Amazonia Craton indicate reduced, nonplume conditions; Kaapvaal Craton inclusions suggest oxidized plume settings.

Conclusions:

  • Mantle redox state is significantly influenced by carbonate subduction and metallic iron (Fe0) interactions.
  • Reduced mantle conditions stabilize cratons, while oxidized plume conditions can lead to lithosphere delamination and volcanism.
  • The redox state of the sublithospheric mantle plays a critical role in cratonic lithosphere evolution and geological activity.