Sedimentary manganese carbonate deposits as faithful proxies of ancient ocean redox fluctuations: Insights from the Permian Zunyi Mn deposits, South China. - Xu, Hai; Gao, Junbo; Yang, Ruidong; Chen, Fangge; Xu, Jinhong; Wang, Li; Yang, Chenchen; Yin, Runsheng (Geological Society of America Bulletin, 2025)