High Precision Re Isotope Analysis of Geological Samples
Journal Title: Chinese Journal of Inorganic Analytical Chemistry - Year 2025, Vol 15, Issue 6
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 sample-standard 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.
Authors and Affiliations
Yu LI, He SUN, Haiou GU, Yu FAN, Dayu ZHANG, Fangyue WANG, Can GE, Taofa ZHOU
Keywords
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- EP ID EP767893
- DOI 10.20236/j.CJIAC.2025.06.007
- Views 9
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