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按板块构造学说,郭令智等把“江南古陆”称为江南岛弧区。它的基底为前震旦纪浅变质岩系,上复震旦系。岩性特点是复理石建造广泛发育,并含有大量火山岩、火山碎屑岩、凝灰岩夹层。目前该区已知主要的铀源层位有上震旦统及下寒武统,含矿主岩为炭硅泥岩。但前震旦系四堡群白云顶组、下震旦统板溪群的白竹组或五强溪组中局部也有铀源层的存在,其铀含量可高达30～40PPM。含矿岩性同上,但稳定性差,规模小,工业价值低。
According to plate tectonics, Guo Lingzhi et al. Called “Jiangnan Ancient Land” as Jiangnan Island Arc Zone. Its basement is the Pre-Sinian epithermal metamorphic rock series, and the Sinian uplift. Lithology is characterized by the widespread development of flysch construction, and contains a large number of volcanic rocks, pyroclastic rocks, tuff intercalations. At present, the area is known to have Upper Sinian and Lower Cambrian uranium source rocks, and the main ore-bearing rocks are carbon siliceous mudstone. However, the former Sinian Si Bao Group Baiyun Ding Formation, Lower Sinian Banxi Group Baijian or Wuqiangxi Formation also exists uranium source layer, the uranium content can be as high as 30 ~ 40PPM. Ore-bearing lithology as above, but poor stability, small size, low industrial value.