流体包裹体及石英LA-ICP-MS分析方法的建立及其在矿床学中的应用

发布时间：2018-04-18 12:27

本文选题：流体包裹体 + LA-ICP-MS　；参考：《岩石学报》2017年10期

【摘要】：流体包裹体LA-ICP-MS(激光剥蚀-电感耦合等离子体质谱仪)分析具有高精度、低检测限、多元素同时微区原位检测的特点,因此在精细刻画成矿过程、深入揭示成矿机理方面具有传统方法无可比拟的优势。通过人工合成石英Na Cl-H2O-Rb-Cs和Na Cl-KCl-Ca Cl2-H2O-Rb-Cs流体包裹体,使用NIST610为外标、显微测温Na Cl等效盐度(电价平衡方法)为内标,建立了流体包裹体L A-ICP-MS分析方法。分析结果的相对误差在±16%以内,绝大部分在±10%以内,相对标准偏差(RSD)小于7%。同时结合国际上推荐的石英标样,使用NIST610为外标、无内标法,建立了石英微量元素LA-ICP-MS分析方法。分析结果表明,石英中主要元素Li、Al和Ti的相对误差在±10%以内,相对标准偏差小于5%。利用建立的方法对鲁西早白垩世王家庄Cu-Mo矿开展了应用研究,结果显示该矿富气相包裹体更富Cu,而含子矿物包裹体富Mo,暗示Cu和Mo可能具有不同的搬运机制,Cu更倾向于气相,Mo则倾向于进入液相,结合流体沸腾现象的存在,这可能是导致该矿上铜下钼分带沉淀的重要因素。此外,从早期岩浆成因石英到成矿期热液石英以及成矿期后石英,微量元素具有明显的Ti降低而Al升高的趋势,暗示成矿元素Cu、Mo的沉淀可能同时还受到温度和流体酸碱度变化的控制。
[Abstract]:The analysis of fluid inclusions by LA-ICP-MS (laser denudation-inductively coupled plasma mass spectrometer) has the characteristics of high accuracy, low detection limit and in situ detection of multiple elements, so the metallogenic process is described in detail.To reveal the metallogenic mechanism in depth has the unparalleled advantage of the traditional method.By synthesizing quartz Na Cl-H2O-Rb-Cs and Na Cl-KCl-Ca Cl2-H2O-Rb-Cs fluid inclusions, using NIST610 as external standard and microscopic temperature measurement NaCl equivalent salinity (electricity valence equilibrium method) as internal standard, a method for analysis of fluid inclusions L A-ICP-MS was established.The relative error of the analysis results is within 卤16%, most of the results are within 卤10%, and the relative standard deviation (RSD) is less than 7%.At the same time, a LA-ICP-MS method for the determination of trace elements in quartz was established by using NIST610 as external standard and no internal standard.The results show that the relative error of Li-Al and Ti in quartz is less than 卤10%, and the relative standard deviation is less than 5%.The application of the established method to the early Cretaceous Wangjiazhuang Cu-Mo deposit in western Shandong was studied.The results show that the ore is rich in Cu-rich gas inclusions and rich in Mo-rich submineral inclusions, suggesting that Cu and Mo may have different transport mechanisms.This may be an important factor leading to the deposit of copper and molybdenum in the ore.In addition, from early magmatic origin quartz to hydrothermal quartz in metallogenic period and quartz after metallogenic period, trace elements have the tendency of decreasing Ti and increasing Al obviously.It is suggested that the precipitation of the ore-forming element Cuomo may also be controlled by the variation of temperature and fluid pH.
【作者单位】：矿床地球化学国家重点实验室中国科学院地球化学研究所;中国科学院大学地球科学学院;中国科学院矿产资源研究重点实验室中国科学院地质与地球物理研究所;中国科学院地球内部物质高温高压重点实验室中国科学院地球化学研究所;
【基金】：国家重点研发计划(2016YFC0600105) 国家自然科学基金项目(41472079)联合资助
【分类号】：P611

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