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Geology; July, 2007; v. 35; no. 7; p. 655-658; DOI: 10.1130/G23764A.1
© 2007 Geological Society of America
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Temporal constraints on the Paleoproterozoic Lomagundi-Jatuli carbon isotopic event

Victor A. Melezhik*,1, Hannu Huhma2, Daniel J. Condon{dagger},3, Anthony E. Fallick4 and Martin J. Whitehouse5

1 Geological Survey of Norway, Leiv Eirikssons vei 39, N-4791 Trondheim, Norway
2 Geological Survey of Finland, FIN-02150 Espoo, Finland
3 Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
4 Scottish Universities Environmental Research Centre, East Kilbride, Glasgow G75 0QF, Scotland
5 Laboratory for Isotope Geology, Swedish Museum of Natural History, Box 50007, S-104 05 Stockholm, Sweden

The Paleoproterozoic Lomagundi-Jatuli positive {delta}13C excursion in sedimentary carbonates represents an event whose magnitude and duration is unique in Earth history, although precise absolute chronology of this event remains poorly constrained. In northeastern Fennoscandia, an ~1300-m-thick sedimentary-volcanic succession of the Pechenga Greenstone Belt records decline of this isotopic excursion. Zircons from sedimentary rocks that occur within the decline have yielded 207Pb/206Pb dates at 2058 ± 2 Ma (±6 Ma including U decay constant uncertainties) and provide the first maximum age constraint on the termination of the Lomagundi-Jatuli event. Combined with existing constraints, these data indicate an ~140 m.y. interval characterized by 13C-rich carbonate accumulation.

Key Words: Fennoscandia • Paleoproterozoic • dolostone • carbon • isotopes • age




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Geological Society, London, Special Publications, January 1, 2009; 323(1): 1 - 26.
[Abstract] [Full Text] [PDF]


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