Journal of Palaeogeography     2019 8 (3):  285-300    ISSN: 2095-3836  CN: 10-1041/P Growth mechanisms and environmental implications of carbonate concretions from the ~1.4 Ga Xiamaling Formation, North China An-Qi Liu1,2, Dong-Jie Tang1,2, Xiao-Ying Shi1,3, Li-Min Zhou4, Xi-Qiang Zhou5, Mo-Han Shang3, Yang Li3, Hu-Yue Song6 1 State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences (Beijing), Beijing 100083, China.; 2 Institute of Earth Sciences, China University of Geosciences (Beijing), Beijing 100083, China.; 3 School of Earth Sciences and Resources, China University of Geosciences (Beijing), Beijing 100083, China.; 4 National Research Center for Geoanalysis, Beijing 100037, China.; 5 Key Lab of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China.; 6 State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences (Wuhan), Wuhan 430074, China. Received: 2019-01-23  Revised: null  Online: null Supporting info null