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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Publisher's URL: http://www.elsevier.com/locate/precamres
Abstract
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 |
| Status: | Published |
| Refereed: | Yes |
| 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: | 0301-9268 |
| ISSN (Online): | 1872-7433 |
| Published Online: | 10 March 2010 |
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