Constraining Shallow Seawater Oxygenation for the Yangtze Platform During the Early Cambrian

Abstract

A large body of geochemical evidence suggests that Earth's atmosphere was oxygenated in two major events, the Great Oxidation Event (GOE) and the Neoproterozoic Oxygenation Event (NOE). The first occurred during the Paleoproterozoic likely between 2.45 and 2.2 Ga, resulting in atmospheric oxygen levels above 10 −5 present atmospheric level (PAL) and an oxygenation of the shallow ocean (