Constraints on the late Ediacaran sulfur cycle from carbonate associated sulfate

We report new sulfur isotope compositions (δ³⁴S) in carbonate associated sulfate (CAS) and pyrite from the lower Nama Group, Namibia (∼550 to 35‰ is highly unusual in Earth history, and in the terminal Ediacaran is best explained by a high pyrite burial flux. Pyrite in the Nama Group is close in isotopic composition to coeval sulfate, but the sulfur isotope fractionation between sulfate and pyrite varies widely among different studied basins, suggesting highly heterogeneous redox and depositional conditions