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四二一○地区位于四川中台坳川北台陷的北缘,濒临秦岭褶皱带。矿化地层系白垩系苍溪组,为陆相的砂泥岩不等厚互层,底部浅色矿砾岩中放射性异常广布。多数人认为,矿化浅色层属冲积相沉积物,并确认恢复古河道是找矿的关键。由于缺乏生物化石,而韵律性颇为明显,故曾根据韵律进行过地层划分和对比。依据韵律进行岩相研究,因缺乏标志层,韵律底部冲刷面延伸断续,导致非同类沉积单元的沉积层进行了对比,以致圈出无边无垠的河道。铀矿化往往位于古地形低洼部位,而古洼地是依据浅色层和韵律
The 4210 area is located on the northern margin of the Taichung-Taichung depression in Sichuan Province and is on the verge of Qinling fold belt. The mineralized strata are the Cretaceous Cangxi Formation, which is an unequal thick interbedded layer of sandstone and mudstone in the continental facies. The radiogenic conglomerate of the light-colored basement has anomalous radioactivity. Most people think that the light mineralized layer is alluvial sediments, and confirm the restoration of the ancient river is the key to prospecting. Due to the lack of biological fossils, and the rhythmicity is quite obvious, so according to the rhythm of stratigraphic division and contrast. Based on the rhythm of lithofacies research, due to the lack of sign layer, rhythmic bottom scouring surface extends intermittently, resulting in the deposition of non-similar sedimentary units were compared, resulting in boundless boundless river. Uranium mineralization is often located in low-lying parts of ancient terrain, and paleo-depressions are based on light-colored layers and rhythm