Using carbonate Zn and conodont Sr isotopes to link marine productivity and chemical weathering intensity changes during the Permian-Triassic transition - He Zhao; Thomas J. Algeo; Xiangdong Wang; Zhengyi Lyu; Xueqian Feng; Xinyang Yao; Zhenfeng Luo; Zhaochu Hu (Geochimica et Cosmochimica Acta, 2026)