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测定岩石和含水矿物的氢同位素组成,对研究成岩成矿作用中水的来源、性质和演化可提供重要的信息,也对研究成岩成矿作用、成矿流体的来源、矿床成因等都具有重要意义。测定含水矿物中D/H比值的关键是从矿物中把水、羟基等含氢成份全部以水的形式提取出来。含水矿物中的水主要以结构水、结晶水和层间水形式存在。其中结构水在矿物中结合得最牢固,只有在高温下(1300℃甚至1400℃以上),使矿物熔融、才能释放出全部水。因此,从含水矿物中提取水必须采用专门的熔样技术。目前国内外都使用高频熔样法(Friedman等,1958;Godfrey,1962,Suzuoki等,1976;郑斯成等,1982)。高频熔样具有升温快、温度高等优点,但需要价格昂贵的高频感应设备,并且高频放电易使水发生电离,使所测样品的δD值产生较大偏差,同时熔样时所用铂金坩埚吸附一定量水份,使空白值较大,影响分析精度,高频熔样法的分析精度一般为±2‰。此外,高频对人体也有一定危害。
Determining the hydrogen isotope composition of rocks and aquifers provides important information for studying the source, nature and evolution of water in diagenesis and mineralization, as well as in the study of diagenesis and mineralization, sources of ore-forming fluids, and genesis of deposits significance. The key to determining the D / H ratio in an aqueous mineral is to extract all the hydrogen-containing components, such as water and hydroxyl groups, from the mineral in the form of water. The water in the hydrous minerals is mainly in the form of structured water, crystal water and intercalary water. The structural water is most strongly bound in the minerals. Only at high temperatures (1300 ° C or even above 1400 ° C) can the minerals be melted to release all the water. Therefore, the extraction of water from hydrous minerals must use a special melting technology. At present, high-frequency melting method is used both at home and abroad (Friedman et al., 1958; Godfrey, 1962, Suzuoki et al., 1976; Zheng Shicheng et al., 1982). High-frequency melting with fast heating, high temperature, but the need for expensive high-frequency induction equipment, and prone to high-frequency discharge ionization of water, so that the measured value of the sample δD deviation, while the sample used when platinum Crucible adsorption of a certain amount of water, so that a larger blank, affecting the accuracy of analysis, high-frequency melting method of analysis accuracy is generally ± 2 ‰. In addition, high-frequency human body also has some harm.