A new negative carbon isotope interval caused by manganese redox cycling after the Shuram excursion

A new negative carbon isotope interval exists immediately after the Shuram excursion at the end of Ediacaran Period
Mn(II) oxidation formed Mn(IV)-oxide, triggering organic C oxidation and precipitating Mn(II)-carbonate with negative C isotope values
Pulsed input of hydrothermal Mn redox cycling overwhelms sulfate reduction as the trigger for the newly discovered negative CIE