本文選題：激光剝蝕 + ICP-MS�。� 參考：《中國地質(zhì)大學(北京)》2015年碩士論文

【摘要】：流體包裹體是礦物晶體在生長過程中捕獲周圍的成礦流體而形成的,因此這些被捕獲的流體包裹體完好的保存了礦物生長過程中的各種地球化學信息,所以對于流體包裹體的認識與研究對于地質(zhì)行業(yè)的發(fā)展有著特殊的意義。激光剝蝕電感耦合等離子體質(zhì)譜(LA-ICP-MS)技術具有分析速度快、靈敏度高、空間分辨率好、受樣品尺寸與性狀影響小、以及多元素同時測定且能夠提供同位素比值信息等一系列優(yōu)勢,因此可用于定量測定單個流體包裹體中常量和微量元素。采用LA-ICP-MS技術對單個流體包裹體成分進行分析,已經(jīng)成為近年來流體包裹體研究的熱點之一。然而,不同于一般固體礦物已經(jīng)建立相對完善且系統(tǒng)的分析方法,流體包裹體由于剝蝕過程中所具有的特性以及自身的復雜性,針對單個流體包裹體的LA-ICP-MS分析方法還在探索中。本文對單體流體包裹體激光剝蝕ICP-MS的分析方法進行研究。通過配置的以飽和Na Cl溶液為基體的系列多元素標準溶液,填充至純石英毛細管中,制成人工流體包裹體。對所配制的毛細管人工流體包裹體進行分析,除碘元素外,其它元素分析結果均表現(xiàn)出良好的精密度。直接以玻璃標樣NIST610為外標,Na元素為內(nèi)標,對毛細管人工流體包裹體(其中Na的含量采用飽和Na Cl溶液理論值)進行測定,其計算結果與所配制標準溶液理論值的相對誤差約為+60%,可能是飽和Na Cl溶液在激光剝蝕過程中Na的析出所致。這表明直接以玻璃標樣作為外標對流體包裹體進行校正分析存在較大的系統(tǒng)誤差。若以Ca或Mg元素作為過渡內(nèi)標,用玻璃標樣NIST610對毛細管人工標樣中的Na引入校正因子,然后以玻璃標樣作為外標,Na元素作為內(nèi)標元素,通過外標結合內(nèi)標的校準方法,對毛細管人工包裹體進行校正分析,各金屬元素的計算結果與配置理論值的相對誤差均在9%以內(nèi)。使用該方法對取自青海省察爾汗鹽湖的石鹽中流體包裹體樣品進行分析計算,將計算結果與以直接以毛細管人工流體包裹體為外標的計算結果相比較,結果高度吻合。由此表明,所建立的單個流體包裹體LA-ICP-MS原位分析校準方法是可行且較準確的。本方法極大減少標準溶液配制中的繁瑣工序,并有利于提高最終分析結果的準確性。
[Abstract]:Fluid inclusions are formed by capturing the surrounding ore-forming fluids during the growth of mineral crystals, so these trapped fluid inclusions have preserved all kinds of geochemical information in the process of mineral growth. Therefore, the understanding and research of fluid inclusions is of special significance to the development of geological industry. Laser denudation inductively coupled plasma mass spectrometry (LICP-MS) technique has a series of advantages, such as high analytical speed, high sensitivity, good spatial resolution, little influence by sample size and character, and the ability of simultaneous determination of multiple elements and the ability to provide isotope ratio information. Therefore, it can be used for quantitative determination of constants and trace elements in single fluid inclusions. The analysis of single fluid inclusions by LA-ICP-MS technique has become one of the hotspots in fluid inclusions research in recent years. However, unlike the relatively perfect and systematic analysis methods for solid minerals, the LA-ICP-MS analysis method for individual fluid inclusions is still being explored because of the characteristics and complexity of the denudation process. In this paper, the analytical method of laser denudation ICP-MS for single fluid inclusions is studied. Artificial fluid inclusions were prepared by filling a series of multielement standard solutions with saturated NaCl solution into pure quartz capillary. The capillary artificial fluid inclusions were analyzed and the analytical results of other elements except iodine showed good precision. The capillary fluid inclusions were directly determined with glass standard NIST610 as external standard and Na as internal standard, in which the content of Na was determined by saturated NaCl solution theory. The relative error between the calculated results and the theoretical value of the prepared standard solution is about 60, which may be due to the precipitation of Na in saturated NaCl solution during laser denudation. This indicates that there is a large systematic error in the correction and analysis of fluid inclusions directly using glass standard samples as external standard. If Ca or mg is used as the transitional internal standard, the calibration factor of Na in the capillary artificial standard is introduced by glass standard NIST610, then the glass standard sample is used as the external standard Na element as the internal standard element, and the calibration method of external standard combined with internal standard is adopted. The correction and analysis of capillary artificial inclusions show that the relative error between the calculated results of each metal element and the collocation theory is less than 9%. This method is used to analyze and calculate the fluid inclusions in the rock salt from Chaerhan Salt Lake in Qinghai Province. The calculated results are in good agreement with those calculated directly using the capillary artificial fluid inclusions as the external standard. It is shown that the calibration method for LA-ICP-MS in situ analysis of single fluid inclusions is feasible and accurate. This method greatly reduces the tedious procedure in the preparation of standard solution and improves the accuracy of the final analysis results.
【學位授予單位】：中國地質(zhì)大學(北京)
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P624

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