| 万康,刘龙,孟平虹,夏寅初.华南产铀与非产铀花岗岩黑云母矿物化学特征研究综述[J].矿产勘查,2022,13(9):1241-1249 |
| 华南产铀与非产铀花岗岩黑云母矿物化学特征研究综述 |
| Review of the biotite mineral chemical characteristics of uranium-bearing and uranium-barren granite plutons in south China |
| 投稿时间：2022-04-01 |
| DOI：10.20008/j.kckc.202209001 |
| 中文关键词: 黑云母 矿物化学 产铀花岗岩 |
| 英文关键词: biotite mineral chemistry uranium-bearing granite |
| 基金项目:本文受江西省研究生创新基金(YC2020-B159)资助。 |
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| 中文摘要: |
| 花岗岩型铀矿是与花岗岩存在密切空间联系和成因联系的热液铀矿。研究表明,花岗岩型铀矿的形成与特定花岗岩有关,黑云母的矿物化学差异在评价花岗岩铀成矿潜力的过程中具有重要意义。本文通过综合论述近年来产铀性花岗岩中黑云母矿物化学进展,探讨黑云母的矿物化学特征在花岗岩产铀性研究中的意义。研究结果如下:(1)相较于同时代非产铀花岗岩,产铀花岗岩中的黑云母多为铁质黑云母和铁叶云母,产铀花岗岩的黑云母明显更富铁。(2)从黑云母铁镁指数来看,产铀花岗岩大多小于0.38,为改造型花岗岩,其原岩来自地壳,属S型花岗岩。(3)黑云母结晶温度和氧逸度也是评估热液成矿潜力的另一重要指标。产铀花岗岩的黑云母结晶温度和氧逸度普遍低于同期非产铀花岗岩。(4)黑云母的氟质量分数也是造成同期相邻花岗岩产铀能力差异的原因,氟质量分数越高,越有利于熔体中铀的富集从而导致富铀矿物的结晶。 |
| 英文摘要: |
| Granite-type uranium deposit is a kind of hydrothermal uranium deposit closely related to granite in space and genesis. In recent years, it has been found that the formation of granite-type uranium deposits is related to the specific granite plutons. It is of great significance to evaluate the mineralization potential of granite-type uranium deposits by utilizing the mineral-chemical differences of biotites. The results are as follows:(1) Biotite in uranium-production granite belongs to ferro-biotite and siderophyllite, compared with adjacent barren uranium granite of the same period. The biotite of uranium-bearing plutons is rich in Fe. (2) The Fe-Mg index of biotite in uranium-bearing granite is less than 0.38, which belongs to reformed granite. The original rock comes from the crust and is S-type granite. (3) The crystallization temperature and oxygen fugacity of biotite can be used as an important indicator to evaluate the mineralization potential of magmatic-hydrothermal solutions. Biotite in uranium-bearing granite has higher iron content, lower crystallization temperature, and oxygen futility than barren granite. (4) The high fluorine content of biotite is conducive to the enrichment of uranium in the melt and crystallization of uranium-bearing minerals, which is one of the reasons for the difference in uranium productive capacity of adjacent granite plutons during the same period. |
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