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C isotopic variations in the lower–middle Frasnian (lower Upper Devonian) of the Rudny Altai

Published online by Cambridge University Press:  13 February 2015

OLGA P. IZOKH ,
NADEZHDA G. IZOKH ,
STANISLAV V. SARAEV  and
GALINA A. DOKUKINA
OLGA P. IZOKH*
Affiliation:
Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Science, prospekt Akademika Koptyuga 3, Novosibirsk 630090, Russia
NADEZHDA G. IZOKH
Affiliation:
Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, prospekt Akademika Koptyuga 3, Novosibirsk 630090, Russia
STANISLAV V. SARAEV
Affiliation:
Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, prospekt Akademika Koptyuga 3, Novosibirsk 630090, Russia
GALINA A. DOKUKINA
Affiliation:
Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Science, prospekt Akademika Koptyuga 3, Novosibirsk 630090, Russia
*
†Author for correspondence: [email protected]
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Abstract

We conducted isotope–geochemical studies of the Upper Devonian of the Rudny Altai. Whole-rock carbon isotope analyses of the studied section represented by carbonate fore-reef facies reveal a negative excursion at the base of punctata Zone. When compared to conodont biofacies turnovers and the Upper Devonian events chart, the new data have demonstrated a synchronism between the negative excursion and the coeval decline in conodont biodiversity corresponding to the Middlesex anoxic event of the Frasnian Stage of the Upper Devonian.

Keywords

carbon isotopesconodontsbiofaciesUpper DevonianMiddlesex
Type
Rapid Communication
Information
Geological Magazine , Volume 152 , Issue 3 , May 2015 , pp. 565 - 571
Copyright
Copyright © Cambridge University Press 2015 

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