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Proceedings Paper

Early Proterozoic (2.04 GA) phosphorites of Pechenga Greenstone Belt and their origin
Author(s): Alexei Yu. Rozanov; Marina M. Astafieva; Richard B. Hoover
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Paper 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.

Paper Details

Date Published: 9 October 2007
PDF: 9 pages
Proc. SPIE 6694, Instruments, Methods, and Missions for Astrobiology X, 669409 (9 October 2007); doi: 10.1117/12.726440
Show Author Affiliations
Alexei Yu. Rozanov, Paleontological Institute (Russia)
Marina M. Astafieva, Paleontological Institute (Russia)
Richard B. Hoover, NASA Marshall Space Flight Ctr. (United States)
National Space Science and Technology Ctr. (United States)

Published in SPIE Proceedings Vol. 6694:
Instruments, Methods, and Missions for Astrobiology X
Richard B. Hoover; Gilbert V. Levin; Alexei Y. Rozanov; Paul C. W. Davies, Editor(s)

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