碲同位素研究进展及其地质应用展望
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本文为江西省教育厅科技计划项目(编号GJJ18038787)、东华理工大学博士科研启动基金项目(编号DHBK2018009)和国家自然科学基金项目(编号41673051)资助成果。


Analytical techniques for tellurium stable isotopes and their geological applications: a review
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    摘要:

    多接收电感耦合等离子体质谱仪以及色谱分离和纯化方法的应用,大大提高了碲(Te)同位素的分析精度和效率,推动了碲同位素研究。本文综述了Te同位素研究的最新进展及其地质应用。碲具有亲硫和亲氧双重属性,同时具有一定的挥发性。自然界(包括陨石)中碲同位素( δ 130/125Te)的变化范围为-4. 12‰~2. 15‰。其同位素分馏受到不同过程的控制,其中球粒陨石碲同位素分馏主要受陨石形成过程中碲的蒸发和冷凝过程的控制,该过程中可引起高达6. 9‰的分馏;自然界中氧化还原反应也可以引起较大的碲同位素分馏(4‰),因此碲同位素可能成为反应成岩成矿过程中氧化还原条件变化的指标;此外,有机溶剂(如石油)参与的萃取作用可引起1. 8‰的碲同位素分馏效应,这一效应在重稳定同位素研究过程中需要引起足够的重视。随着碲同位素分馏机制的进一步明晰,碲可能在示踪成矿物质来源、限定成矿时间以及指导矿产勘查等方面得到更为广泛的应用。

    Abstract:

    Data from multiplecollector inductively coupled plasmamass spectrometry and liquid chromatographic procedure have led to a significant improvement in precise and quick determination of Tellurium (Te) isotope compositions, thus promoting studies of these isotopes. This contribution provides a summary of recent advances in Te isotopes and their geological implications. Te is a chalcophile, lithophile and volatile element, with δ130/125Te varying from -4. 12‰ to 2. 15‰ which can be attributed to different processes. The Te isotope compositions (with an overall variation of 6. 9‰) of chondrites are controlled by evaporation and condensation processes. Oxidation and reduction process can also cause Te isotopic fractionation (up to 4‰), and thus Te isotopes may act as proxies for redox conditions. Besides, liquidliquid extraction, a process overlooked by many researchers, can cause 1. 8‰ isotopic fractionation of Te and thus should be accounted for during the study of stable heavy isotopes. As the mechanism of Te isotope fractionation is further elucidated, Te isotopes may gain widely application on tracing sources of oreforming materials, dating mineralization time, locating orebodies and so on.

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陈加杰,冷成彪,许德如,王大钊,李凯旋.2020.碲同位素研究进展及其地质应用展望[J].地质学报,94(5):1655-1663.
CHEN Jiajie, LENG Chengbiao, XU Deru, WANG Dazhao, LI Kaixuan.2020. Analytical techniques for tellurium stable isotopes and their geological applications: a review[J]. Acta Geologica Sinica,94(5):1655-1663.

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  • 收稿日期:2019-12-19
  • 最后修改日期:2020-03-23
  • 录用日期:2020-03-26
  • 在线发布日期: 2020-03-28
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