Paleo-interlayer oxidation zone identification and spatial localization prediction in Daying area
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摘要:
潜在铀储层内部的层间氧化作用与铀成矿作用同时进行而且密不可分,(古)层间氧化带被认为是砂岩型铀矿的重要找矿标志。运用岩芯和钻孔资料以及各分带的岩石矿物学以及地球化学特征等信息识别古层间氧化带,结合铀储层中具有古氧化性质和还原性质的岩石地球化学标志,定量地给予古层间氧化带以空间定位,并据此可以划分出古完全氧化带、过渡带和还原带。在此基础上,探讨了铀储层规模、隔挡层、暗色泥岩及煤层等因素对于古层间氧化带分布的影响。
Abstract:Interlayer oxidation in potential uranium reservoir is closely related to uranium mineralization. Paleo-interlayer oxidation zone is considered to be an important symbol in search for sandstone type uranium deposits. In this paper, core drilling data and mineralogy and geochemical characteristics of each sub-band of interlayer oxidation were used to identify the paleo-interlayer oxidation. Combined with paleo-oxidic and reductive properties of uranium geochemical markers in uranium reservoirs, paleointerlayer oxidation was spatial positioned quantitatively. Accordingly, paleo-completely-oxidized zone and transitional zone and reduction zone were divided and identified. On such a basis, the distribution of paleo-interlayer oxidation zone controlled by the scale of the uranium reservoir, barrier layers, the dark mudstone and coal seam and other factors was discussed.
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表 1 大营地区陆源碎屑及填隙物组分在不同氧化分带中的特征
Table 1. Terrigenous clastic and interstitial materials component characteristics in different oxidation zones in Daying area
表 2 大营地区不同类型砂岩的环境敏感参数对比
Table 2. Comparison of environmentally sensitive parameters of different types of sandstone in Daying area
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