Mechanisms of geothermal formation in gneiss and granite distribution areas revealed by geochemical methods: Ailao Mountain orogenic belt, China - Lei Chen; Jinchuan Zhang; Miao Shi; Yuhang Sun; Xingxu Zhao; Tiancheng Xie; Qinyuan Cao; Xiaochang Tong; Jie Li (Geochemistry, 2026)