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首页> 外文会议>International GeologicalCongress >The Application of Capillary Ion Analysis to the Geochemistry of Natural Aqueous Fluids and in particular to the Analysis of Fluid Inclusions in Minerals
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The Application of Capillary Ion Analysis to the Geochemistry of Natural Aqueous Fluids and in particular to the Analysis of Fluid Inclusions in Minerals

机译：毛细管离子分析在天然含水流体地球化学中的应用，尤其是矿物质中的流体夹杂物分析

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For an understanding of hydrothermal processes, information on the dissolved metal load of an aqueous fluid and the nature and concentration of ligands are important parameters. Crush-leach methods to extract samples of inclusion fluids from small (lg and less), reasonably homogenous specimens require the analysis of low volumes of leachates for anionic and cationic species. At the beginning of this decade a new analytical technique was introduced, capillary ion analysis (CIA) or capillary electrophoresis (CE), as a fast and comparatively inexpensive technique. The separation is based on the different electrophoretic mobilities of the hydrated or complexed species or their charge/mass ratio, in an electrolyte moving through a fused silica capillary in an electric field. The detection is accomplished at the end of the capillary by indirect UV detection. CIA allows two different modes of analyte introduction into the capillary, i) by hydrostatic pressure and, ii) by electromigration. The latter mode is unique to CIA and not only allows the restricted intake of only one ionic species (cations or anions) but also causes an enrichment of the species at the tip of the capillary by a factor of 50 to 100 under normal conditions of analysis. Detection limits in the lower ppb region and, in some cases in the ppt region can thus be achieved. CIA has already been employed to the analyses of a wide variety of fluids, ranging from fluids in pegmatite quartz, fluids in sulphides and gangue minerals from MVT deposits, fluids in quartz and sulphides from hydrothermal base metal deposits to leach fluids from basic rocks as well as to the analysis of REE in small samples. The major cations detected include NII4+, K+, Na+, Ca2'1", Mg2+, Mn2'1", Fe2+, Zn2+ and as minor cationic components Co, Ni, Cu, Sr, Ba and Be. Major anions or ligands detected were Cl", SO42', HCO3 HSiO^3" and less frequently SO^2", SjO-)2", HS", IIAsO^2", SeO^2', MoO,(2" and F. Recently a number of organic ligands were identified. In a number of cases geothermometers (NA-K-Ca and Na-Li) were employed to calculate fluid temperatures. A good agreement between temperatures obtained by micro thermometry and by geothermometry was observed. Although CIA is a complex and highly interactive analytical technique which requires further development, most analyses in the field of fluid inclusion research can be accomplished without resorting to different analytical techniques.
机译：热液过程的理解，在含水流体和配体的性质和浓度的溶解的金属负载信息是重要的参数。压碎浸取方法包含流体的提取物样品从小型（LG和更小），合理地均匀的标本需要浸出液对阴离子和阳离子物质的低体积的分析。在引入新的分析技术本世纪初，毛细管离子分析（CIA）或毛细管电泳（CE），作为一种快速和相对廉价的技术。分离是基于通过熔融石英毛细管在电场中移动的水合的或络合的物种或它们的电荷/质量比值的不同电泳迁移率，在电解质中。所述检测是在由间接UV检测的毛细管的端部来实现的。 CIA允许检物导入的两种不同的模式进毛细管，i）在流体静压力，并通过电迁移ⅱ）。后一种模式是唯一的CIA和不仅允许受限的进气只有一种离子物质（阳离子或阴离子），而且还导致了50倍的在毛细管的前端的物种的富集至100分析的正常条件下的。在下部区域PPB检测极限，并且在某些情况下，在PPT区因此可以实现。 CIA已经用于各种各样的流体的分析中，从从MVT存款伟晶岩石英流体，流体在硫化物和脉石矿物，在石英流体和硫化物从热液碱金属沉积物浸出从基本岩石以及流体作为稀土元素的小样本在分析中。检测到的主要的阳离子包括NII4 +，K +，钠离子，Ca2'1" ，Mg2 +的，Mn2'1" ，Fe2 +的，Zn2 +和作为次要阳离子成分钴，镍，铜，锶，钡和Be。检测主要阴离子或配体是CL “SO42' ，HCO3 HSIO ^ 3" 和较不频繁地SO ^ 2" ，SjO-）2" ，HS”，IIAsO ^ 2" ，SEO ^ 2' ，的MoO，（2"和F.最近鉴定了一些有机配体。在一些情况地温（NA-K-Ca和的Na-Li）的被用来计算流体温度，观察由微测温和通过地热测量获得的温度之间的良好的一致性虽然CIA是一个复杂和高度交互的分析技术，其需要进一步的发展，在流体夹杂物研究领域最分析可以不诉诸不同的分析技术来完成。

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