| 兰 君.鲁西微山稀土矿床同位素特征及成矿物质来源指示[J].地质与勘探,2023,59(4):747-759 |
| 鲁西微山稀土矿床同位素特征及成矿物质来源指示 |
| Isotopic characteristics and source indication of ore-forming materials of the Weishan rare earth deposit in western Shandong |
| 投稿时间：2022-07-07 修订日期：2023-05-08 |
| DOI：10.12134/j.dzykt.2023.04.005 |
| 中文关键词: 稀土 同位素 成矿物质来源 微山 鲁西 |
| 英文关键词: rare earth, isotopes, ore-forming material source, Weishan, western Shandong Province |
| 基金项目:山东省自然资源厅基金项目（编号：鲁勘字（2018）30号、鲁勘字（2020）32号）；山东地矿局基金项目
（编号：KC202104、KY202207）联合资助 |
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| 中文摘要: |
| 近年来，鲁西微山稀土矿找矿取得重要进展，特别是在钻孔岩心中发现新的矿石类型-细脉浸染状矿石。该类型矿石赋存于碱性杂岩体中，不同于以往的脉状碳酸盐-硫酸盐矿石。此类矿石的成因机制，特别是物质来源，尚不明确。为解决上述问题，本次研究对钻孔岩心中的细脉浸染状矿石开展了详细的方解石C-O同位素、硫化物和硫酸盐S同位素以及辉钼矿Re-Os同位素分析。分析结果显示，方解石的δ13CV-PDB值为-6.4‰～-7.6‰，δ18OV-PDB值为-19.6‰～-20.1‰（转换为δ18OV-SMOW值为10.1‰ ～ 10.7‰)，硫化物的δ34SV-CDT值为-5.2‰～-7.0‰，硫酸盐的δ34SV-CDT值为δ34SV-CDT为4.1‰～7.3‰，均具有幔源特征。辉钼矿中Re含量为28.86×10-6，Os含量为0.03×10-9，显示壳幔混合特点。上述同位素特征表明成矿过程中具有幔源物质参与，且与矿区碱性杂岩体物质来源一致，暗示成矿流体可能来自幔源碱性岩浆分异。 |
| 英文摘要: |
| Recently, significant progress has been made in the exploration of the Weishan rare earth deposit in western Shandong Province, especially in the discovery of a new type of ore - fine vein disseminated ore - in borehole cores. This type of ore occurs in alkaline complexes, unlike previous vein like carbonate sulfate ores. The genetic mechanism of this type of ore, especially its material source, and the similarities and differences between it and veined ore are not yet clear. In order to solve the above problems, this study carried out detailed analysis of calcite C-O isotope, sulfide and sulfate S isotope and molybdenite Re-Os isotope for veinlet disseminated ores in the drill core. The analytical results show that the calcites have δ13CV-PDB of -6.4‰~-7.6‰ and δ18OV-PDB of -19.6‰~-20.1‰ (converted to δ18OV-SMOW of 10.1‰~10.7‰), sulfides and sulfates have δ34SV-CDT of -5.2‰~-7.0‰ and 4.1‰~7.3‰, respectively, showing significant mantle derived characteristics. In addition, the Re and Os concentrations of molybdenite are 28.86×10-6 and 0.03×10-9, respectively, showing mixing features of mantle and crust. All the above isotopic compositions indicate that mantle derived materials are involved in the mineralization process and are consistent with the source of alkaline complex materials in the mining area, suggesting that the ore-forming fluids might be derived from the mantle-derived alkaline magmas. |
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