Geochemical characteristics of tourmaline in Longqiao skarn Fe deposit in LYRMB, Eastern China: Constraints on magmatic-hydrothermal processes - Shasha Liu; Yu Wang; Mingguang Sun; Zhuang Zhao; Hui Luo; Muhammad Hafeez; Linzi Li; Xiaoyong Yang; Jiandong Sun; Bangguo Ou (Journal of Geochemical Exploration, 2026)