| 冯恺嘉,钟福军,牛佰强,曹栩,潘家永,夏菲.矿物自动定量分析系统在拉拉矿床矿物学研究中的应用[J].矿产勘查,2026,17(3):503-511 |
| 矿物自动定量分析系统在拉拉矿床矿物学研究中的应用 |
| Application of automated quantitative mineral analysis system in mineralogical studies of the Lala deposit |
| 投稿时间：2025-12-18 |
| DOI：10.20008/j.kckc.202603007 |
| 中文关键词: TIMA 铀矿物 稀土矿物 IOCG型矿床 拉拉矿床 |
| 英文关键词: TESCAN Integrated Mineral Analyzer uranium mineral rare earth mineral IOCG deposit Lala deposit |
| 基金项目:本文受国家自然科学基金(42362011、42272090)、东华理工大学核地学部揭榜挂帅项目(2024HDX02)、铀资源探采与核遥感全国重点实验室基金项目(NKLUR-WDZC-2025-02)联合资助。 |
| 作者 | 单位 | | 冯恺嘉 | 东华理工大学铀资源探采与核遥感全国重点实验室,江西南昌 330013
东华理工大学核资源与环境国家重点实验室,江西南昌 330013 | | 钟福军 | 东华理工大学铀资源探采与核遥感全国重点实验室,江西南昌 330013
东华理工大学核资源与环境国家重点实验室,江西南昌 330013 | | 牛佰强 | 东华理工大学铀资源探采与核遥感全国重点实验室,江西南昌 330013
东华理工大学核资源与环境国家重点实验室,江西南昌 330013 | | 曹栩 | 东华理工大学铀资源探采与核遥感全国重点实验室,江西南昌 330013
东华理工大学核资源与环境国家重点实验室,江西南昌 330013 | | 潘家永 | 东华理工大学铀资源探采与核遥感全国重点实验室,江西南昌 330013
东华理工大学核资源与环境国家重点实验室,江西南昌 330013 | | 夏菲 | 东华理工大学铀资源探采与核遥感全国重点实验室,江西南昌 330013
东华理工大学核资源与环境国家重点实验室,江西南昌 330013 |
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| 中文摘要: |
| 拉拉矿床位于扬子地块西南缘，康滇地区的中段，是中国典型的 IOCG型矿床。该矿床主要产出铁铜矿石，同时伴生一定铀、稀土矿化。本文以拉拉矿床为研究对象，通过运用捷克 TESCAN电镜公司的 TIMA系统，结合偏光显微镜观察，以期查明矿石中铀矿物、稀土矿物的矿物种类、矿物之间的接触关系以及矿物共生组合，并进一步讨论了铀、稀土矿物的成矿阶段。获得如下认识:(1)拉拉矿床铀矿物以晶质铀矿、钛铀矿为主:晶质铀矿与钠长石、磁铁矿紧密共生，钛铀矿颗粒细小(4.54~11.82 μm)，多呈针状、短柱状集合体分布于晶质铀矿边缘。稀土矿物以氟碳铈矿为主，与绿泥石、黄铁矿、黄铜矿及磷灰石共生。(2)拉拉矿床铀矿物共生组合为铀矿物-方解石-萤石组合，该组合形成于硫化物-石英-碳酸盐-萤石阶段(不早于 850 Ma)属于晚期铀矿化。稀土矿物共生组合为稀土矿物-磷灰石-石英组合，被磷灰石包裹的稀土矿物形成于磁铁，矿-硫化物阶段(990±4 Ma)未被包裹的稀土矿物则形成于硫化物-石英-碳酸盐-萤石阶段。 TIMA矿物相图显示铀矿物脉体穿插铁铜，矿物与稀土矿物，暗示拉拉矿床晚期铀矿化晚于矿床主体铁铜矿化(不早于 1.05 Ga)以及稀土矿化。本研究不仅为拉拉矿床的矿物学研究提供技术支撑，也为中国铀、稀土资源的高效利用提供重要参考。 |
| 英文摘要: |
| The Lala deposit, located on the southwestern margin of the Yangtze Block and in the central seg-ment of the Kangdian region, is a typical Iron Oxide-Copper-Gold (IOCG) deposit in China. Dominated by Fe-Cumineralization, this deposit is also associated with substantial uranium (U) and rare earth element (REE) mineraliza-tion. This study concentrates on the Lala deposit, utilizing the TIMA electron microscope (produced by TESCAN,Czech Republic) and polarized microscopy to identify uranium and rare-earth mineral types, their contact relation-ships, and mineral assemblages. Additionally, it discusses the mineralization stages of these uranium and rare-earthminerals. Key findings are summarized as follows: (1) Uranium minerals in the Lala deposit are dominated by urani-nite and brannerite. Uraninite is closely associated with albite and magnetite, whereas brannerite particles are fine-grained with sizes ranging from 4.54 to 11.82 μm, and occur predominantly as acicular or short-columnar aggre-gates along the margins of uraninite. The dominant REE mineral is bastn.site, which is closely associated with chlo-rite, pyrite, chalcopyrite, and apatite. (2) The U mineral assemblage in the deposit is defined as the U mineral-calcite-fluorite assemblage, which formed during the sulfide-quartz-carbonate-fluorite stage (~850 Ma), corre-sponding to the late U mineralization. The REE mineral assemblage is characterized by REE minerals, apatite, andquartz. Specifically, some REE minerals are enclosed within apatite that precipitated during the magnetite-sulfidestage, while the non-enclosed REE minerals formed during the sulfide-quartz-carbonate-fluorite stage (990±4Ma). TIMA images reveal that U mineral cuts across Fe-Cu and REE minerals, suggesting that late uranium miner-alization in the Lala deposit postdates both the main Fe-Cu mineralization (~1.05 Ga) and the REE mineralization.This study not only provides technical support for the mineralogical research of the Lala deposit but also offers im-portant references for the efficient utilization of China's uranium and rare-earth resources. |
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