Local depositional and diagenetic conditions control the positive δ34S excursion during the Ordovician-Silurian transition: Evidence from the Wufeng-Longmaxi formations in Sichuan Basin - Gengchen Li; Xianghao Meng; Songzhuo Li; Mingshi Feng; Chaochao Xing; Xianguo Lang (Palaeogeography, Palaeoclimatology, Palaeoecology, 2024)