On the Lomagundi-Jatuli carbon isotopic event: the evidence from the Kalix Greenstone Belt, Sweden

Melezhik, V.A. and Fallick, A. (2010) On the Lomagundi-Jatuli carbon isotopic event: the evidence from the Kalix Greenstone Belt, Sweden. Precambrian Research, 179(1-4), pp. 165-190. (doi: 10.1016/j.precamres.2010.03.002)

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We report a significant new database on the carbon and oxygen isotopic analyses (233 whole-rock, and 43 microcored samples) obtained from sedimentary dolostones in the Kalix Greenstone Belt from the Fennoscandian Shield of Sweden. This characterises the second half of the prominent Palaeoproterozoic Lomagundi-Jatuli positive carbon-isotope excursion. Within a 600 m-thick succession of alternating volcanic, volcaniclastic, siliciclastic and dolomitic rocks from greenschist–epidote-amphibolite metamorphic facies, the least altered dolostone samples show a gentle oscillation between +2‰ and +4‰ throughout stratigraphy with a second-order positive excursion from +4‰ through +8‰, and gradually back again to +4‰ in the c. 150 m-thick unit in the middle and upper parts of the succession. This second-order excursion is superimposed on the general relatively rapid δ13C decline at the second half of the Lomagundi-Jatuli isotopic event and coincides with the transition from a marine-influenced rift to a passive margin setting. If the excursion is global, it would reveal internal fine structure of the Lomagundi-Jatuli isotopic excursion; if not, basinal local factors are the main players. Lithostratigraphic and C-isotope correlation between Kalix and neighbouring Peräpohja Schist Belt successions, 40-km-apart, suggest an incomplete geological record in both successions despite the absence of obvious non-depositional unconformities.

Item Type:Articles
Keywords:Fennoscandian Shield; palaeoproterozoic; rift; passive margin; rimmed shelf; dolostone; stromatolites; carbon isotopes
Glasgow Author(s) Enlighten ID:Fallick, Professor Anthony
Authors: Melezhik, V.A., and Fallick, A.
Subjects:G Geography. Anthropology. Recreation > GE Environmental Sciences
College/School:College of Science and Engineering > Scottish Universities Environmental Research Centre
Journal Name:Precambrian Research
Journal Abbr.:Precambrian Res
ISSN (Online):1872-7433
Published Online:10 March 2010

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