| 二连盆地马尼特坳陷南北双向供源铀成矿模式探讨 |
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| 引用本文： | 韩效忠,吴兆剑,司马献章,俞礽安,李建国,胡航,蒋喆.二连盆地马尼特坳陷南北双向供源铀成矿模式探讨[J].煤田地质与勘探,2018,46(6):1-10. |
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| 作者姓名： | 韩效忠 吴兆剑 司马献章 俞礽安 李建国 胡航 蒋喆 |
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| 基金项目： | 国家重点研发计划项目（2018YFC0604200）；国家重点基础研究发展计划（973计划）项目（2015CB453000）；中国地质调查局地质调查项目（DD20160127） |
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| 摘 要： | 内蒙古二连盆地马尼特坳陷是中国北方重要的砂岩型铀成矿区带之一。前人铀矿找矿工作主要聚焦于马尼特坳陷北缘，认为坳陷南部不具备铀成矿的基本条件或成矿减弱。而煤铀兼探最新成果表明，坳陷南缘已初步控制一条长约6.8 km的铀矿带，指示南缘具备与北缘同等的成矿前景。通过对比剖析马尼特坳陷南北缘典型铀矿床（点）的地质特征，结合坳陷沉积构造演化历史，构建了马尼特坳陷南北双向供铀的统一铀成矿模式，指出:马尼特坳陷南北缘均以层间氧化带型铀成矿为主，但坳陷北缘以赛汉组上段为主要找矿目的层，而坳陷南缘以赛汉组下段为主要找矿目的层，赛汉组上段为次要找矿目的层。马尼特坳陷主要铀成矿期可分为三期:第一期铀成矿为二连组晚期至古近纪早期，代表铀成矿年龄为（68±1.6）Ma~（63.4±5.5）Ma，成矿类型为潜水氧化带型；第二期铀成矿为古近纪中期，代表铀成矿年龄为（51.2±4.3）Ma，成矿类型为层间氧化带型为主，兼有潜水氧化带型；第三期铀成矿为古近纪中晚期，代表铀成矿年龄为（44±5）Ma~（37.1±1.9）Ma，成矿类型为层间氧化带型，第二和第三期铀成矿是本区主成矿期，且随着时间的推移，铀矿体变富变大。今后铀矿找矿重点应向马尼特坳陷南缘转移，且有望落实一条长度大于70 km的铀成矿带，为马尼特坳陷南缘铀矿找矿工作指明了方向。
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| 关 键 词： | 双向供源 铀成矿模式 找矿远景 马尼特坳陷 二连盆地 |
| 收稿时间： | 2018-07-12 |
Metallogenic model of uranium with source supply from the south and the north in Manite depression of Erlian basin,Inner Mongolia |
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| Abstract: | Manite depression, located in Erlian basin of Inner Mongolia, is one of the most important metallogenic zone in Northern China. Previous prospecting work paid more attention on northern Manite depression, it was thought that the south of the depression didn't have or weak metallogenic ability. While the latest exploration results show that a 6.8 km-long uranium ore belt is discovered and indicate the south has an equivalent metallogenic prospect as the north. After contrasting geological characteristics of typical uranium deposits in both sides and analyzing sedimentary-tectonic evolution of Manite depression, a double uranium sources metallogenic model was established which points out that main metallogenic type in northern and southern Manite depression is interlayer oxidation zone, while the main ore prospecting target is Upper Saihan Formation in the north and Lower Saihan Formation in the south. The uranium metallogenic epoch can be divided into 3 stages:The first stage where phreatic oxidation type uranium mineralization dominated is from late Erlian period to early Paleogene period with a representative uranium metallogenic age of(68±1.6) Ma-(63.4±5.5) Ma; the second stage, mainly an interlayer oxidized zone type and a phreatic oxidation type as supplement, is in middle Paleogene period with a representative uranium metallogenic age of(51.2±4.3) Ma; the last stage where an interlayer oxidized zone type uranium mineralization dominated is in middle-late Paleogene period with a representative uranium metallogenic age of(44±5) Ma-(37.1±1.9) Ma. The second and the third stage are the main mineralization stages and the uranium orebody grew with time. Above work indicates that emphasis of prospecting should be shifted from northern Manite depression to southern Manite and a 70 km-long mineralized belt will be proved hopefully. |
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