季節性硫酸鹽還原與硫化礦物物種之變化

This research studied sulfate reduction and iron sulfide mineral formation in the
DaPan Bay sediment. Twelve cores were sampled in the study area. Pore water
sulfate, chloride, dissolved sulfide and sediment organic carbon, inorganic carbon,
AVS, pyrite-S, reactive iron were analyzed.
The result demonstrated that sulfate reduction and iron sulfide mineral formation
predominate in the study DaPan Bay sediment. Rapid sulfate reduction and high
concentrations of dissolved sulfide as well as AVS and pyrite-S were observed in the
anoxic DaPan Bay sediments. Flushing of seawater from the only inlet constantly
provided oxic seawater as well as sulfate into the bay.
Regional variations of sulfate reduction and sulfide mineral formation were also
observed. Inner bay sediments were characterized by high concentrations of organic
carbon, dissolved sulfide, AVS and pyrite-S. Away from the inner bay, organic
carbon concentration decreased rapidly as well as dissolved sulfide in the pore water.
Low reactive iron was the primary limiting factor for the observed high C/S ratios in
the DaPan Bay sediment.