A rapid rise of seawater δ13C during the deglaciation of the Marinoan Snowball Earth

The Marinoan Snowball Earth glaciation (~650–635 Ma) was followed by an increase in atmospheric O2 level and the diversification of eukaryotes. These dramatic changes have been assumed to have resulted from the rapid recovery of primary productivity during deglaciation, but this hypothesis has not yet been tested. Carbonate carbon isotope (δ13Ccarb), closely related to organic matter production and burial, has the potential to provide with the...