High-precision CA-ID-TIMS zircon U-Pb geochronology: a review of the Neoproterozoic time scale

The Neoproterozoic Era is a critical time interval when the Earth experienced fundamental changes, manifested as Snowball Earth climatic extremes, large fluctuations in oceanic and atmospheric compositions, and emergence and rapid diversification of animals. High-precision geochronology of Neoproterozoic stratigraphy is essential for constraining timings, durations, and rates of these major events, and for assessing the synchroneity and nature of interactions between them. Here we review recent advances in the CA-ID-TIMS zircon U-Pb dating method and discuss the factors that influence the choice of method used to date Neoproterozoic stratigraphy. Advances in the temporal calibration of major carbonate carbon isotope excursions, glaciations, and fossil assemblages of the Neoproterozoic using high-precision age constraints, are also reviewed. This enables us to construct a composite carbonate carbon isotope profile for the Neoproterozoic, which is anchored by radio-isotopic ages. Together with available biodiversity metrics, this provides critical insights into the co-evolution of life and environment in the Neoproterozoic.