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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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Related Experiment Video

Updated: Jun 16, 2026

Laboratory Simulation of an Iron(II)-rich Precambrian Marine Upwelling System to Explore the Growth of Photosynthetic Bacteria

Laboratory Simulation of an Iron(II)-rich Precambrian Marine Upwelling System to Explore the Growth of Photosynthetic Bacteria

Published on: July 24, 2016

A stratified redox model for the Ediacaran ocean.

Chao Li¹, Gordon D Love, Timothy W Lyons

¹Department of Earth Sciences, University of California, Riverside, CA 92521, USA. chaoli@ucr.edu

Science (New York, N.Y.)

|February 13, 2010

Summary

During the Ediacaran Period, ocean chemistry featured distinct euxinic and ferruginous zones. This stratified ocean model explains early animal fossil distribution.

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Area of Science:

Paleoceanography
Geochemistry
Paleontology
Ediacaran Period
Early animal evolution

Background:

The Ediacaran Period (635–542 million years ago) witnessed significant environmental shifts and the emergence of the first macroscopic animals.
Understanding Ediacaran ocean chemistry is crucial for explaining the evolutionary trajectory of early life.
Previous studies proposed conflicting geochemical redox conditions for Ediacaran deep oceans.

Purpose of the Study:

To reconstruct the detailed spatial and temporal ocean chemistry of the Ediacaran Period.
To investigate the environmental conditions in the Nanhua Basin, South China, during the Ediacaran.
To reconcile conflicting geochemical data and explain the fossil record of early metazoans.

Main Methods:

Analysis of the Doushantuo Formation in the Nanhua Basin, South China.
Detailed spatial and temporal reconstruction of Ediacaran ocean chemistry.
Geochemical modeling to simulate ocean stratification and redox conditions.

Main Results:

Evidence found for a metastable zone of euxinic (anoxic and sulfidic) waters on the continental shelf.
Discovery of ferruginous [Fe(II)-enriched] deep waters coexisting with shelf euxinia.
A dynamically maintained stratified ocean with coeval oxic, sulfidic, and ferruginous zones throughout the Ediacaran, favored by low oceanic sulfate concentrations.

Conclusions:

The study presents a model of a stratified Ediacaran ocean that reconciles previously conflicting geochemical redox conditions.
This ocean chemistry model provides a framework for understanding the patchy temporal distribution of early metazoan fossils.
The findings highlight the complex interplay between ocean chemistry and early animal evolution during the Ediacaran.