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铼(Re)是地球上最稀有的元素之一，很少形成独立的矿床。自然界中Re集中产出于辉钼矿中，但辉钼矿作为富集Re的典型矿物，由于W-Re分离的困难，其Re同位素的研究仍为空白。联合运用AG1-X8型阴离子树脂和TODGA树脂进行Re的分离提纯，在保证Re接近完全回收(Re回收率约98%)的前提下，一遍提纯流程可使Mo/Re比值降低约100%,W/Re比值降低约99%，因此，可建立适用于辉钼矿等高W/Re比值地质样品高效的Re提纯流程。提纯后的Re溶液上Neptune Plus型多接收电感耦合等离子体质谱仪(MC-ICP-MS)进行测定，采用W掺杂校正和样品—标样间插法均可获得高精度Re同位素组成。四件国产标准Re溶液的测量结果分别为：δ187Re(BWB2376-2016-1)=-0.05‰±0.05‰(n=6)、δ187Re(BWB2376-2016-2)=-0.65‰±0.06‰(n=30);δ187Re(GSB04-1745-2004)=-0.26‰±0.04‰(n=12);δ187Re(GSBG-62064)=-0.22‰±0.04‰(n=12)。对USGS岩石学标准物质BCR-2、SBC-1、BHVO-2和七件天然辉钼矿样品进行全流程处理，并进行Re同位素测定，测得：δ187Re(BCR-2)=-0.02‰±0.05‰(n=6)、δ187Re(SBC-1)=-0.02‰±0.04‰(n=3)、δ187Re(BHVO-2)=-0.01‰±0.05‰(n=2)，与前人发表的数据在误差范围内。天然辉钼矿石的δ187Re存在显著差异，为-0.34‰～0.27‰，表明自然界辉钼矿的Re同位素存在分馏，系统的Re同位素研究具有示踪矿体演化过程和成矿物质来源的潜力。
Abstract：Rhenium(Re) is one of the scarcest elements on Earth and seldom forms independent deposits. In nature,Re is concentrated in molybdenite. However,due to the challenge in separating W and Re,the study of Re isotopes in molybdenite remains a void. In this paper,the combination of AG1-X8 anion resin and TODGA resin was employed to separate and purify Re. On the premise of ensuring an almost complete recovery of Re(with a Re recovery rate of approximately 98%),a single purification process can reduce the Mo/Re ratio by around 100% and the W/Re ratio by about 99%. Consequently,an efficient Re purification process suitable for geological samples with high W/Re ratios,like molybdenite,can be established. The purified Re solution is measured on the Neptune Plus MC-ICP-MS,and high-precision Re isotope composition can be achieved through W doping and the samplestandard bracketing correction. The results of four domestic standard Re solutions are as follows:δ187Re(BWB2376-2016-1)=-0. 05‰±0. 05‰(n=6),δ187Re(BWB2376-2016-2)=-0. 65‰±0. 06‰ (n=30),δ187Re(GSB04-1745-2004)=-0. 26‰±0. 04‰(n=12),δ187Re(GSBG-62064)=-0. 22‰ ±0. 04‰ (n=12). The USGS reference materials and molybdenite ore samples were processed throughout the entire process,and the Re isotope was determined. The results indicated that δ187Re(BCR-2)=-0. 02‰ ±0. 05‰ (n=6);δ187Re(SBC-1)=-0. 02‰±0. 04‰ (n=3);δ187Re(BHVO-2)=-0. 01‰±0. 05‰ (n=2),which are consistent with previously published data within the error range. The δ187Re values of seven natural molybdenite samples show a significant difference in δ187Re values of approximately 0. 6‰ (ranging from-0. 34‰ to 0. 27‰),suggesting that there is fractionation of Re isotopes in natural molybdenite. Systematic investigations of Re isotopes hold the potential to trace the evolutionary process of ore bodies and the source of mineralizing materials.
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基本信息:
DOI：10.20236/j.CJIAC.2025.06.007
中图分类号:O657.63;O614.713;P623
引用信息:
[1]李宇,孙贺,顾海欧等.地质样品的高精度Re同位素分析[J].中国无机分析化学,2025,15(06):800-810.DOI:10.20236/j.CJIAC.2025.06.007.
基金信息:
国家自然科学基金重点项目（42430811）;国家自然科学基金项目面上项目（42373001）; 地质过程与矿产资源国家重点实验室开放课题资助项目（GPMR202314）