Global Geology     2020 23 (1):  1-15    ISSN: 1673-9736:  CN: 22-1371/P Geochronology, geochemistry and geological significance ofEarly Cretaceous volcanic rocks from Niangniangshan Formation,Ningwu Basin, middle and lower reaches of the Yangtze River PING Zhilan1, WANG Li1, ZHANG Yajing1, XIN Wei1, LI Liang2, QIAN Lingyu3 1. College of Earth Sciences, Jilin University, Changchun 130061, China; 2. School of Resource Environment and Earth Science, Yunnan University, Kunming 650500, China; 3. The First Geological Brigade, Jiangsu Bureau of Geology and Mineral Exploration, Nanjing 210041, China Received 2019-10-29  Revised 2019-11-20  Online 2020-02-25 Reference  null Corresponding author: WANG Li