Chapter 7. Early Precambrian Ferruginous Quartzites (Jaspilites)

M. M. Astafieva1
1Borissiak Paleontological Institute, Russian Academy of Sciences, Moscow, Russia

Tóm tắt

Microfossils of presumably bacterial origin were found in 2.7–2.8 Ga banded ferruginous quartzites in Karelia and the Kola Peninsula. The determination of organic carbon content and balance calculations showed that these ferruginous quartzites accumulated in an organic-rich environment. A comparative analysis of the morphology of modern and Neoarchaean microorganisms suggests the bacterial origin of some of the magnetite in the studied quartzites.

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