Volcanic forcing of the Lomagundi-Jatuli carbon isotope excursion.

ABSTRACT: The Lomagundi-Jatuli Event (LJE), Earth's most pronounced and prolonged positive carbon isotope excursion, followed the Great Oxidation Event and remains enigmatic in origin. We present a Pb-Pb isochron age of 2,194 ± 5 Ma for black shales from the Francevillian FB Formation, Gabon-an LJE type locality-coinciding with the emplacement of the Large Igneous Province that gave rise to the extensive Birimian-Eburnean orogenic segment. This orogeny produced very large volumes of juvenile crust in the form of oceanic plateau basalts that were eventually reworked through subduction and collisions. These processes released substantial volcanic CO₂ into the ocean-atmosphere system, disrupting the carbon and oxygen cycles for 100 to 200 My. Volcanic outgassing likely outpaced alkalinity pr

SUBMITTER: Blichert-Toft J 

PROVIDER: S-EPMC12704732 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature