Organic and inorganic carbon cycles in the monogenetic volcanic field: Example from the Longgang volcanic field, NE China - Yutao Sun; Yaru Li; Yue Zhang; Xiaoyong Zhao; Peizhan Li; Zhengfu Guo; Wenbin Zhao; Xiangang Xie; Jiang Wang; Jie Tang (Global and Planetary Change, 2026)