Sources and transport of potassium in a typical carbonate-type lake (Bangor Co) on the Qinghai-Tibet Plateau: Constraints from potassium isotopes - Jiangdi Zhou; Binkai Li; Jiangang Jiao; Maoyong He; Zhongli Tang; Yuanyuan Cheng; Zhengyan Li; Jiaxin Luo; Huihui Rao; Jing Wen; Li Deng; Zhikang Liu (Journal of Hydrology, 2026)