| 石英一水一盐体系氧同位素分馏作用 |
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| 引用本文：.1990.Oxygen isotope fractionation in the quartz-water-salt system[J].Mineral Deposits,9(2):158~166 |
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| 基金项目:国家自然科学基金资助项目(4860149) |
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| 中文摘要:温度为180一550℃，盐度(wt．％)分别为0、5、25和40条件下，在高压釜内完成了由硅胶合成石英的氧同位素分馏作用实验研究，目的是了解：① 盐同位素效应；② Δt值对同位素分馏的影响；③ 温度与同位素分馏系数的关系。研究资料表明：低温条件下矿物和纯水之间同位素平衡作用不可能发生，影响含氧矿物（初）之间氧同位素平衡速率的因素包括盐度、Δt值大小和温度等；我们的研究还表明，盐度对同位素分馏作用同系数无影响，即不存在所谓的“同位素盐效应”。在180一550℃温度范围内，不同盐度条件下获得的石英一水氧同位素分馏实验方程为：1000lnα石英-水=3.306×106T-2一2.71。 |
| 中文关键词:氧同位素分馏 盐效应 |
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| Oxygen isotope fractionation in the quartz-water-salt system |
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| Abstract:Oxygen isotope fraefionatin accompanied by hydrothermal crystallization of quartz from silica gel at 180℃ to 550℃and under salinities of 0, 5, 25 and 40 wt．％has been studied to get some knowledge about the effect of the salinity, △t value, reaction mechanism and temperature on isdtope fractination. The data obtained suggest that oxygen isotope equilibrium between ailica gel and pure water at low temperature cannot bd established．Factors affecting the exchange rate between oxygen-bearing phases include the salinity of solution, △i value and temperature. The authors do not agree with the conclusion oil salt isotope effect put forward by Truesdell(1974). The temperature dependence of oxygen isotope fraotionation between quartz and water at 180℃ to 550℃and salinities Of 5, 25 and 40 wt．％are as follows：1000lnαQ-H2O = 3.306×106T-2-2.71. |
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