Shuram-Wonoka carbon isotope excursion: Ediacaran revolution in the world ocean's meridional overturning circulation

The late Ediacaran Shuram-Wonoka excursion, with delta C-13(carb) values as low as -12 parts per thousand (PDB) in marine-shelf deposits and spanning up to 10 Myr, is the deepest and most protracted delta C-13(carb) negative anomaly recognised in Earth history. The excursion formed on at least four continents in low (<= 32 degrees) palae-olatitudes, and in China is associated with a major phosphogenic event. Global and intrabasinal correlation, magnetostratigraphy, isotope conglomerate tests and further geochemical data are consistent with a primary or syn-depositional origin for the excursion. Continental-margin phosphorites are generated by oceanic upwelling driven by surface winds, and delta C-13(carb) negative anomalies are explicable by oceanic upwelling of C-13-depleted deep oceanic waters, arguing that a feature common to these exceptional Ediacaran events was unprecedented perturbation of the world ocean. These events occurred during the transition from an alien Proterozoic world marked by low-palaeolatitude glaciation near sea level and strong seasonality to the familiar Phanerozoic Earth with circum-polar glaciation and temperate climate, suggesting that the Shuram-Wonoka excursion is related to this profound change in Earth's climate system. Of various hypotheses for Proterozoic low-palaeolatitude glaciation, only the high obliquity (>54 degrees) hypothesis, which posits secular decrease in obliquity to near the present-day value (23.5 degrees) during the Ediacaran, predicts an unparalleled revolution in the Ediacaran world ocean. The obliquity controls the sense of the world ocean's meridional overturning circulation, which today is driven by the sinking of cold, dense water at the poles and upwelling driven by zonal surface winds. When the decreasing obliquity passed the critical value of 54 degrees during the Ediacaran the meridional temperature gradient reversed, with the equator becoming warmer than the poles and Hadley low-latitude (<30 degrees-35 degrees) atmospheric zonal circulation reversing. This reversal of the temperature gradient is unique to the Ediacaran Period and caused reversal of the oceanic meridional overturning circulation, with upwelling of anoxic, C-13-depleted deep oceanic waters producing a deeply negative and protracted delta C-13(carb) signature on late Ediacaran marine-shelf deposits. (C) 2017, China University of Geosciences (Beijing) and Peking University. Production and hosting by Elsevier B.V.