RE:earlierwhile I had it open. my reference for this was from:
https://www.geochron.com.au/wp-content/uploads/2016/11/60.-Nelson-1997.pdf The recognition of major episodes of catastrophic mantle overturn between 2760 and 2670 Ma has important implications for the deposition of the major banded ironformation sequences during the Late Archaean and Early Proterozoic. During these overturn events, the spreading centres within the ocean basins were the main focus of mafic magmatism. It is proposed here that most of the Fe in the Late Archaean to Early Proterozoic banded-iron sequences was derived, by hydrothermal enrichment of seawater in Fe, from extensive ultramafic submarine lava plains erupted during these catastrophic mantle overturn events. The banded iron-formation sequences of the Amazon, So Francisco, Kaapvaal, Karnataka and Pilbara cratons all overlie thick sequences of volcanic rocks that were erupted between c. 2800 and 2680 Ma. Emplacement of these volcanic sequences resulted in slow subsidence of these stable continental platforms until c. 2500 Ma. This subsidence facilitated the deposition, and preservation, of these Late Archaean to Early Proterozoic banded-iron sequences.
Iskyhigh wrote: Supposedly mantle overturn occurred very near to our time period. This is a simulation. See 1:49 for the overturn event.