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1大地构造背景研究区位于扬子陆块东南边缘与江南造山带的结合部位。由于全球性的Rodinia超大陆裂解,在华南形成了新元古代被动陆缘裂谷盆地(殷鸿福等,1999;王剑,2001),并由于断裂、拉张作用形成多个拉张盆地(周琦等,2007)。而含锰层位大塘坡组便沉积于这些盆地中。
1 Geotectonic Background The study area is located at the junction of the southeastern margin of the Yangtze block and the Jiangnan orogenic belt. The Neoproterozoic passive continental rift basins formed in southern China (Yin et al., 1999; Wang Jian, 2001) due to the global fracture of the Rodinia supercontinent and resulted in the formation of several extensional basins Qi et al., 2007). However, the Datangpo Formation containing manganese deposits in these basins.