In this chapter we show that

The metal chemistry of anoxic systems is dominated by reactions with reduced sulfur species. These reduced sulfur systems presently characterize the Earth’s subsurface and are occasionally important in marine and freshwater systems. In the first half of Earth history, of course, the surface environments were also anoxic and the reduced sulfur chemistry played an even more widespread role in the geochemistry of base metals (e.g., Canfield 1998; Holland 2004).

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In order for metals to be transported within anoxic systems, the metals must be held in solution. Intuitively, this would appear problematical because...

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