地浸砂岩型铀矿床铀-镭平衡系数研究及其地质意义

Study on U-Ra Equilibrium Coefficient of the In-situ Leaching Sandstonetype Uranium Deposits——A Case Study of Qianjiadian Uranium Deposit

对地浸砂岩型铀矿床中矿化砂岩和非矿化砂岩、矿化泥岩和非矿化泥岩样品进行了系统的铀-镭平衡系数研究,惊奇地发现矿化砂岩和矿化泥岩都普遍偏铀,非矿化砂岩和非矿化泥岩都普遍偏镭,而且矿化泥岩比矿化砂岩更偏铀,非矿化泥岩比非矿化砂岩更偏镭。表明泥岩类岩石在铀成矿的地质时期内是具有渗透性的,非矿化泥岩和非矿化砂岩可以为铀成矿提供重要的铀源。

This paper investigated the U-Ra equilibrium coefficient （K,） of mineralized sandstone and mudstone, and unmineralized sandstone and mudstone for the in-situ leaching sandstone-type uranium deposits. It is surprised that all of the mineralized sandstone and mudstone are both relatively to be partial to uranium, but all of the unmineralized sandstone and mudstone are both relatively to be partial to radium. Meanwhile the uranium in mineralized mudstone is relatively richer than that in mineralized sandstone, and the radium in unmineralized mudstone is relatively richer than that in unmineralized sandstone. It is suggested that mudstones were permeable at the uranium mineralized phase and the unmineralized mudstone and sandstone could serve as important mineralized uranium source.