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Pre-Tommotian age of the lower Pestrotsvet Formation in the Selinde section on the Siberian platform: carbon isotopic evidence

ARTEM KOUCHINSKY^*,*, STEFAN BENGTSON, VLADIMIR PAVLOV, BRUCE RUNNEGAR, ANATOLIJ VAL’KOV^|| and EDWARD YOUNG^¶

^* Center for Astrobiology, Institute of Geophysics and Planetary Physics, University of California, Los Angeles, California 90095-1567, USA
Department of Palaeozoology, Swedish Museum of Natural History, Box 50007, SE-104 05 Stockholm, Sweden
Institute of Physics of the Earth, Bol’shaya Gruzinskaya 10, Moscow 123995, Russia
NASA Astrobiology Institute, MS 240-1, Ames Research Center, Moffett Field, California 94035, USA
^|| Institute of Geological Sciences, Russian Academy of Sciences (Siberian Branch), Pr. Lenina 39, 677020 Yakutsk, Sakha, Russia
^¶ Department of Earth and Space Sciences, University of California, Los Angeles, 595 Charles Young Drive East, Box 951567, Los Angeles, California 90095-1567, USA

Carbon isotopic data from the Selinde section in the southeastern part of the Siberian platform area are correlated with the reference isotopic profile from the Lower Cambrian stratotype sections of the Lena–Aldan region, but also show additional ¹³C excursions unrecognized there. The chemostratigraphic correlation suggests that the geological and fossil record of the lower Pestrotsvet Formation in the Selinde section has a deeper history than the stratotype region. This conclusion is important for both constraining the age of the earliest Cambrian marine transgression on the Siberian platform and providing a clearer understanding of the pace and order of early Cambrian geochemical and biological events.

Key Words: Cambrian • Precambrian • carbon • isotope ratios • stratigraphy

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