A reaction-transport model of periodic precipitation of pyrite in anoxic marine sediments

作者：Bektursunova Rimma^*; L'Heureux Ivan

来源：Chemical Geology, 2011, 287(3-4): 158-170.

DOI：10.1016/j.chemgeo.2011.06.004

• Periodic precipitation pattern
• Liesegang bands
• Sapropel sediments
• Early diagenesis
• Reaction-transport models

Periodic precipitation patterns (Liesegang bands) constitute good manifestations of self-organization in geochemical systems. Examples of periodic pyrite bands have been previously reported in anoxic sediment systems, such as sapropels from the Eastern Mediterranean. In this contribution, we present a model of Liesegang pyrite band formation in anoxic marine sediments. The model is based on early diagenetic reactive-transport processes and incorporates nucleation and growth of pyrite crystallites. The simulation results of pyrite band formation are compatible with the experimental pyritization pattern observed in a sediment analog, as well as the observations in sapropel sediments.

• 出版日期2011-8-21