High positive carbonate carbon isotope excursion identified in the North China Craton: Implications for the Lomagundi-Jatuli Event

Records of the Lomagundi-Jatuli Event (LJE) are well preserved globally, but high C-delta 13(carb) carbonates have not been identified in the North China Craton (NCC). Our results on similar to 3-4 km thick carbonates from the newly confirmed Palaeoproterozoic successions in Fanhe Basin in the northeastern NCC show that the similar to 2.20-2.06 Ga carbonates have positive carbon isotope excursion and those deposited after 2.06 Ga have normal carbon isotope. Specially, carbonates from the Daposhan Formation have C-delta 13(carb) values of 10.2%degrees-11.8%degrees, which is the largest positive carbon isotope excursion in the NCC. The similar to 2.20-2.06 Ga carbonates in Fanhe Basin have similar C-delta 13(carb) values as those contemporaneously deposited in other cratons and their C-delta 13(carb) values exhibit a decreasing trend from similar to 2.20 Ga to 2.06 Ga. Our identification of carbonates with high positive C-delta 13(carb) values in Fanhe Basin not only casts new lights on records of the LJE in the NCC, but also provides important constraints on global significance of the positive C-delta 13(carb) excursion of LJE.