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Petrographic analysis of textures and microstructures in muds and mudstones from the Chile Triple Junction reveals that formation of framboidal pyrite begins in the top few meters below sea floor (mbsf), and continues during and after the formation of such features as vein structures, faults, and microfaults. Pyrite formation is strongly influenced by primary porosity, as shown by the many microfossils filled by pyrite and by major concentrations of pyrite localized within coarser grain sizes. Some microfossil shells are coated and outlined by pyrite, and many calcareous microfossils are partially dolomitized. Glauconite and phosphate occur as clasts in sand- and silt-sized lithologies. Rare phosphatic concretions form in place within organic-rich muds. Cataclastic fabrics form along some microfaults, but other planar structures exhibit little or no deformation. Microfaults, fractures, and vein structures play an important part in the transport of fluids during diagenesis and lithification.

Textural and Microstructural Evidence for Sediment Diagenesis in the Vicinity of the Chile Triple Junction