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Multiple ¹³C excursions spanning the Cambrian explosion to the Botomian crisis in Siberia

¹ Department of Earth Sciences, Oxford University, Parks Road, Oxford OX1 3PR, United Kingdom
² Centre Nationale de Recherches Scientifiques, Centre de Recherches Pétrographiques et Géochemiques, 54501 Vandoeuvre-les-Nancy, France
³ Palaeontological Institute, 113 Profsoyuznaya, Moscow 117647, Russia

New high-resolution ¹³C data through the Lower Cambrian of Siberia reveal multiple, positive excursions coincident with phases in the "explosion" of invertebrate phyla (Nemakit-Daldynian to middle Botomian stages). Comparison of the ¹⁸O and trace element (Mg, Fe, Mu, Sr) chemistry indicate that six new ¹³C cycles are primary rather than diagenetic features, with potential for global correlation. Positive ¹³C excursions up to +3 indicate that fractional organic carbon burial rates were high but variable through the Cambrian explosion. Values for ¹³C dropped sharply from around +2.2 to -1.6 in Botomian time, coincident with mass extinction of the archaeocyathan reef biota. The rapid fluctuation of the ¹³C signal and the temporal coincidence of the pronounced negative shift with the extinction event hint that the ¹³C record may record productivity variations during the Early Cambrian radiation.

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