PPT Slide

Conclusions

• Extensive glaciations in Neoproterozoic (Sturtian & Varanger)

• Iron formations associated with Sturtian

• Correlated Canadian & Australian examples

• Hydrothermal source for iron and silica

• There are no clear evidences of a “Snowball Earth”

• The IFs can be an evidence against SE

• Their deposition: mixing of warm metal charged brines and cold waters (overturn caused by the presence of glaciers).

• The maximum concentration of iron and silica - periods of minimum clastic input.

• There is no a clear genetic relation between IFs and glaciations

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