Abstract
Two hyperthermal events with different carbon cycle perturbations occurred across the Cretaceous-Palaeogene (K-Pg) boundary, i.e., the late Maastrichtian Warming Event (LMWE) and the early Danian Dan-C2 event. However, the roles played by Deccan volcanism and orbital forcing in these two hyperthermals are still debated. Here, we obtain a new terrestrial δ13Ccarb record in the Nanxiong Basin (southeastern China) and compare it with marine records. The results show that both the LMWE and Dan-C2 event can be well distinguished in the terrestrial record and that the Dan-C2 event is characterized by a typical hyperthermal event; however, the specificity of the context under which this event occurred has resulted in inconsistencies in the marine records. In addition, the δ13C excursion during the LMWE was more muted and prolonged than that during the Dan-C2 event, and the short-eccentricity cycle disappeared in the marine record during the LMWE, indicating that Deccan volcanism perturbed the carbon cycle during the LMWE, while the Dan-C2 event was less influenced by volcanic perturbation.