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以合成包裹体作为腔体,用显微激光拉曼探针就位分析了H2O-CO2-CH4混合流体的高温特性。研究结果表明,在高温下,CH4和CO2相互之间对各自拉曼光谱的影响不大,水分子对它们的拉曼峰有比较大的影响。在等容条件下,流体均一前,随着温度的升高,水分子的氢键几乎呈线性减少,均一为气相的流体,水分子伸缩振动拉曼峰的变化与一般气体变化相似;随着温度升高,体系压力的增加,最大峰频率呈很微小的降低趋势。均一为液相的流体中的水分子,在均一温度时,氢键变化发生了转折,均一后流体中水分子的氢键受温度的影响比均一前明显要小,在测量的最高温度520 ℃,水分子存在着一定的氢键作用。一直到拉曼光谱测量的最高温度580 ℃还未均一的流体,液相中水分子存在比较强的氢键作用。 相似文献
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本文论述了在300℃,500巴和溶液/岩石质量比为 10的条件下用迪克森金袋和焊封小管技术研究了JB-2玄武岩玻璃-热液(蒸馏水、0.5%Na_2CO_30.5.5%NaHCO_3,0.14% NaHCO_3、二不同Cl-/HCO_3~-比的 NaCl-NaHCO_3和0,1% NaCl溶液)反应中的溶液化学变化和蚀变矿物形成过程.结果表明,两种实验中得到的次生矿物组合基本相同;300℃和500巴时玄武岩玻璃-钠盐溶液(包括海水)反应实质上是玄武岩玻璃-水反应;碳酸盐离子使溶液中的钠含量降低以及形成次生碳酸盐。 相似文献
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In order to understand the mechanism of basalt-seawater interaction, including the role ofCO_2-species, the change in solution chemistry and the formation of the secondary minerals in thereaction between JB-2 basalt glass-hydrothermal solution have been studied by both Dicksongold cell and sealed capsule techniques at 300℃ and 500 bars and solution/rock mass ratio ofabout 10. Solutions used are H_2O, 0.5% Na_2CO_3, 0.5% NaHCO_3, 0.14% NaHCO_3, NaCl-NaHCO_3with different Cl~-/HCO_3~- ratio, and 0.1% NaCl solutions. The results clearly indicate thatthe two tyges of experiments have a basically identical alteration mineralogy. The basaltglass-Na-salt solution (including seawater) reaction at 300℃ and 500 bars essonfially is areaction between basalt glass and water. The presence of CO_2-species causes the decrease ofNa-content in the reacted solution and the formation of the secondary carbonate. 相似文献
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以合成包裹体为腔体进行高温下流体的拉曼光谱原位分析 总被引:6,自引:0,他引:6
在冷封口的水热高压容器中 ,合成了组成分别为H2 O 4 2 0wt%CO2 和H2 O 8 4 2wt%CO2 的两种流体包裹体。以此合成的包裹体作为腔体 ,用显微激光拉曼探针测量了其中液态流体在 2 90 0~ 380 0cm-1范围的高温拉曼光谱 ,对其中液态水的氢键随温度的变化进行了讨论。研究结果表明 ,随着温度升高 ,流体中水分子的氢键作用不断减弱。组成为H2 O 4 2 0wt%CO2 的包裹体 ,在 372℃均一为液体 ,均一时 ,水分子的氢键发生了突变 ,均一后 ,氢键受温度的影响比较小 ,到 5 5 0℃它还存在着比较强的氢键作用。组成为H2 O 8 4 2wt%CO2 的流体在 6 0 6℃时由气液两相变为纯气相 ,一直到拉曼光谱测量的最高温度 5 80℃ ,液态水还保持着比较强的氢键作用。 相似文献
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Using a gold cell hydrothermal apparatus the solubility of the MH (magnetite + hematite)buffer assemblage in HCl aqueous solutions was determined at 300℃ and 500 bar. The activity of ions in hydrothermal solutions was estimated, and the experiment data were treated by ridge regression and iteration to fit to all possible Fe speciation schemes. The result showed that the dominant Fe species in solutions was FeOH~+ under the run conditions. The equilibrium constant for the dissolution reaction was obtained, K=57.161. △G_5~0,FeOH~+ value of -260.3 kJ/mol at 300℃ and 500 bar was calculated. Fe basically exists as Fe-OH species in hydrothermal solution under geologically reasonable conditions of pH and chloride concentration. 相似文献
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The solubility of Fe_2O_3 in dilute KOH and HClO_4 aqueous solutions was determined at 300℃ and 10 MPa. The analysis of the solubility data indicated that in neutral and alkaline hydrothermal solutions iron mostly existed as Fe(OH)_3~0 and Fe(OH)_4~-, and it was calculated that △G_(Fe(OH)_3~0)~0=-561.9±3.3kJ/mol, and △G_(Fe(OH)_4~0)~0=-662.7±5.0 kJ/mol at 300℃. According to the analysis on the previous experimental studies about the transporting form of iron, the existing form of iron in hydrothermal solutions is discussed in this paper. 相似文献
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超临界水理论研究的进展* 总被引:6,自引:0,他引:6
通过计算模拟、拉曼光谱、NMR以及衍射分析对超临界水静态结构进行了广泛的研究,氢键结构是这些研究的重要内容。研究结果显示在临界点附近水的氢键结构受到很大的破坏,只有相当于常温下29%左右的氢键存在。利用微波波谱法、NMR法以及准弹性不边疆中子散射方法对超临界水动力学进行了研究。结果发现,在临界点附近,水分子的动力学重排时间急剧缩短,这就使得以超临界水为介质的化学反应速率大大增加。由于微波的周期比较长,可能大大地超过了超临界水结构的动力学重排时间,因此微波波谱法不适合于高温低密度超临界水的动力学研究。今后需要加强超临界水氢键结构变化的机理和动力学的实验与模拟的研究。 相似文献