Morphology and in-situ sulfur isotope characteristics of pyrite across the Ordovician-Silurian boundary marine shale in South China: Indicative significance for sedimentary environment - Shichao Ji; Chao Liang; Yu Han; Qing Tang; Yingchang Cao; Keyu Liu; Jing Wu; Haoran Xie; Fanglu Chen (Marine and Petroleum Geology, 2025)