| 张万良.砂岩铀矿床新构造渗出成矿作用[J].地质找矿论丛,2023,38(1):1-12 |
| 砂岩铀矿床新构造渗出成矿作用 |
| Uranium exudation metallogenesis of sandstone type uranium deposit from Neotectonics |
| 投稿时间：2022-04-08 |
| DOI：10.6053/j.issn.1001-1412.2023.01.001 |
| 中文关键词: 砂岩铀矿床 烃源岩 新构造 渗出成矿 成矿模式 油气盆地 |
| 英文关键词:Sandstone type uranium deposit hydrocarbon source bed Neotectonic exudation metallogenesis metallogenic model oil-gas basin |
| 基金项目:中国铀业有限公司—东华理工大学核资源与环境国家重点实验室联合创新基金项目（编号：NRE2021-08）和东华理工大学放射性地质与勘探技术国防重点学科实验室开放基金项目（编号：2020RGET03）联合资助。 |
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| 中文摘要: |
| 砂岩铀矿床，特别是产于油气盆地中的砂岩铀矿床是铀矿床的重要类型。油气盆地的完整的补-径-排水动力系统是砂岩铀矿形成的基本动力学条件，但这种"补"是通过盆缘山体蚀源区"补"还是通过盆地深部流体"补"，这种"径"是沿着砂岩层由高处往低处径流还是由低处向高处径流，以及成矿后的流体是如何排出的，都没有充分的论据进行过论述。砂岩型铀矿成矿物质来源、运移和沉淀富集机理仍是有待解剖研究的重大理论课题，为此，笔者换了个视角，从盆地深部烃源岩提供成矿物质来源的思路，重新思考砂岩铀矿的沉淀富集机理。研究认为，砂岩铀矿床是新构造期渗出成矿作用下的产物，铀及伴生元素来源于盆地深部烃源岩（内源或深源），而不是来源于现代蚀源区（外源或浅源）；铀的迁移是在新构造期切层断层发育并成为导矿构造的前提下，在强还原环境中以有机络合物形式存在的铀等金属元素，由深部向浅部迁移，而不是在氧化带中以碳酸铀酰络合物形式由浅部向深部渗移；铀等元素的沉淀是由于氧化还原作用而发生的，具体说是先氧化后还原而形成的，而不是直接由还原作用形成的。最后建立了油气盆地砂岩铀矿床新构造渗出成矿模式。 |
| 英文摘要: |
| Sandstone type uranium deposits, especially those occurring in oil-gas basins are important ones. The complete water recharge-run off-drainage dynamic system supplies the basic dynamic condition for formation of the sandstone type uranium deposit. Whether the recharge and run off is from the marginal mountain erosion source area or depth of the basin, whether the fluid run off the high position to low position or vise versa along layer of the sandstone and how to drain the post-mmineralization fluid are still argued without sound evidences. On the other hand the ore material source, transportation, precipitation and concentration mechanism of uranium is still a theoretical problem. Dealing with the problems from different view the author considers that sandstone type uranium deposit is the Neotectonic exudation product and uranium is derived from hydrocarbon source bed to depth of basins rather than modern erosion area. Uranium and other metals are transported in the form of organic complexes from depth to shallow position under strong reduction environment along fault which cuts cross the sandstone layers and becomes the ore-conducting structure rather than in the form of complex of uranium carbonate from shallow position to depth in the oxidation zone. Precipitation of uranium and other elements are not resulted from only oxidation or only reduction but also both of them, first oxidation then reduction. Based on the above mentioned is built a Neotectonic exudation metallogenic model for the sandstone type uranium deposit. |
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