Early Proterozoic (2.04 GA) phosphorites of Pechenga Greenstone Belt and their origin

Alexei Yu. Rozanov; Marina M. Astafieva; Richard B. Hoover

doi:10.1117/12.726440

9 October 2007 Early Proterozoic (2.04 GA) phosphorites of Pechenga Greenstone Belt and their origin

Alexei Yu. Rozanov, Marina M. Astafieva, Richard B. Hoover

Proceedings Volume 6694, Instruments, Methods, and Missions for Astrobiology X; 669409 (2007) https://doi.org/10.1117/12.726440
Event: Optical Engineering + Applications, 2007, San Diego, California, United States

Abstract

No principal differences have been found between microfossils described from Cambrian and Phanerozoic and the 2000 Ma phosphorites. Numerous samples revealed diverse microbial microstructures interpreted as cyanobacterial mats consisting of filamentous (1-3 μm in diameter, 20 μm in length), coccoidal (0.8-1.0 μm) and ellipsoidal or rod-shaped microfossils (0.8 μm in diameter, around 2 μm in length) which morphologically resemble modern Microcoleus and Siphonophycus, Thiocapsa, and Rhabdoderma, respectively, reported from alkaline or saline environments. The sequence of the early Palaeoproterozoic events which point to a significant oxidation of the hydrosphere, including the formation of phosphorites and changes in the phosphorous cycle, mimics the sequence which was repeated at the Neoproterozoic-Cambrian transition, implying that oxidation of the terrestrial atmosphere-hydrosphere system experienced an irregular cyclic development.

Citation Download Citation

Alexei Yu. Rozanov, Marina M. Astafieva, and Richard B. Hoover "Early Proterozoic (2.04 GA) phosphorites of Pechenga Greenstone Belt and their origin", Proc. SPIE 6694, Instruments, Methods, and Missions for Astrobiology X, 669409 (9 October 2007); https://doi.org/10.1117/12.726440

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