富硫化物热泉中硫代钨酸盐的形成、迁移、转化及其环境地球化学意义

In the proposed project, a quantitative analytical method for thiotungstates in geothermal water will be developed with a system combining Reversed-Phase Ion-Pair Chromatography and Inductively Coupled Plasma Mass Spectrometry (RP-IPC/ICP-MS), based on which the total contents of tungsten and its speciation in the selected sulfide- and tungsten-rich hot springs as well as the environmental media affected by the discharge of those hot springs will be determined, with the Daggyai and Semi geothermal areas in Tibet and the Rehai geotheral area in Tengchong, Yunnan as the study areas where the geothermal waters discharge predominantly via hot springs. Two scientific issues will be focused on during the implementation of the project: 1) the formation mechanism of the thiotungstates in sulfide-rich geothermal waters and the reaction kinetics for the transfromation between tungstate and various thiotungstates; 2) the impact of thiotungstates formation on the geochmecial behavior of geothermal tungsten at the water-mineral interface. On the basis of the above studies, the distribution of geothermal tungsten in the affected environmentl media in the study areas will be systematically investigated and the significant importance of thiotungstates for the environmental geochemical transport, transformation and fate of geothermal tungsten will be clarified.

本项目拟基于反相离子对色谱-电感耦合等离子体质谱联用技术（RP-IPC/ICP-MS）建立地热水中硫代钨酸盐的定量分析方法。依托此方法，在国内选择以富硫化物/富钨热泉为主要地热水排泄方式的地热区（拟选西藏搭格架、色米和云南腾冲热海），开展热泉及受热泉排泄影响的其他环境介质中钨及其各种形态的定量分析，探讨以下两个科学问题：1）富硫化物地热水中硫代钨酸盐的形成机制及钨的各种形态之间相互转化的反应动力学；2）硫代钨酸盐的形成对地热水中钨在水-矿物界面的地球化学行为的影响。在此基础上，在所选地热区查明热泉成因钨在不同环境介质中的分布，并阐明硫代钨酸盐在钨的环境地球化学迁移、转化和归宿中的重要意义。

本项目基于反相离子对色谱-电感耦合等离子体质谱联用技术（RP-IPC/ICP-MS）建立了地热水中硫代钨酸盐的定量分析方法。依托此方法，在国内选择以富硫化物/富钨热泉为主要地热水排泄方式的地热区，开展了热泉及受热泉排泄影响的其他环境介质中钨及其各种形态的定量分析，探讨了以下重要科学问题：富硫化物地热水中硫代钨酸盐的形成机制及钨的各种形态之间相互转化的反应动力学；硫代钨酸盐的形成对地热水中钨在水-矿物界面的地球化学行为的影响。在此基础上，在所选地热区查明了热泉成因钨在不同环境介质中的分布，并阐明了硫代钨酸盐在钨的环境地球化学迁移、转化和归宿中的重要意义。