低温拉曼光谱分析流体包裹体盐度的条件约束

发布时间：2018-06-04 00:12

本文选题：低温拉曼光谱 + 流体包裹体　；参考：《光谱学与光谱分析》2017年08期

【摘要】：流体包裹体盐度及类型是分析地质流体作用的重要地球化学参数。NaCl-H2O体系是地质体中最常见的流体体系之一,其盐度通常由显微测温法获得,而盐水合物的低温拉曼光谱不仅可以用来计算流体包裹体盐度,还可以区分盐水类型。理论上讲,低温冷冻条件下的流体包裹体并非均匀体系,单一测点的拉曼光谱具有较强的局限性,由其计算的盐度并不能代表整个流体包裹体的盐度。为了更好地了解低温条件下流体包裹体的相变特征及其拉曼光谱对盐度的响应,本文通过配置五种不同浓度的NaCl溶液,研究了其在低温下的结晶过程及拉曼光谱特征。结果显示,在反复冷冻与升温过程中,冰晶首先形成,而水石盐的形成依赖于盐溶液的浓缩,多形成于冰晶间的缝隙中。水石盐的四个拉曼特征峰中,p1[(3 402±1)cm-1]和p2[(3 419±1)cm-1]相对强度稳定,p3[(3 432±2)cm-1]和p4[(3 535±4)cm-1]相对强度随盐度增加发生大幅度变化,从而导致相同盐度样品不同测点的拉曼特征比值随盐度增加而愈发离散。因此,传统的流体包裹体单一测点低温拉曼测盐误差较大,数据分析显示多点测试统计平均值才能更好的反映流体的真实盐度。相对于强度和半高宽,总峰面积与盐度相关性最好,是计算盐度的首选参数。该研究阐述了低温拉曼测盐的实验操作和数据处理方法,并阐明了其在流体包裹体分析中的应用条件。尽管操作过程较复杂,但其抗干扰强,应用盐度范围广,计算结果可靠,是重要的测盐方法。
[Abstract]:The salinity and type of fluid inclusions are one of the most common fluid systems in geological bodies. The.NaCl-H2O system is one of the most common fluid systems in geological bodies. The salinity of the fluid is usually obtained by microthermometry. The low temperature Raman spectra of the saltwater compound can not only be used to calculate the salinity of fluid inclusions, but also can distinguish the type of brine. On the other hand, the fluid inclusions in cryopreservation are not homogeneous systems, and the Raman spectra of a single point have strong limitations. The salinity calculated by them does not represent the salinity of the whole fluid inclusions. In order to better understand the phase transition characteristics of fluid inclusions and the response of Raman spectra to the salinity under low temperature conditions, this paper is discussed in this paper. The crystallization process and Raman spectra of five different concentrations of NaCl were studied at low temperature. The results showed that the ice crystals formed first in the process of repeated freezing and heating, and the formation of the water stone was dependent on the concentration of salt solution and formed in the gap between the ice crystals. Of the four Raman characteristics of the water stone salt, p1[(3402 +. 1) the relative strength of cm-1] and p2[(3419 + 1) cm-1] is stable, the relative intensity of p3[(3432 + 2) cm-1] and p4[(3535 + 4) cm-1] increases with the increase of salinity, which leads to the increasing of the Raman characteristic ratio of the same salinity samples with the increase of salinity. The data analysis shows that the multipoint test statistical mean can better reflect the true salinity of the fluid. Relative to the strength and half width, the total peak area is the best correlation to salinity, and it is the first choice for the calculation of salinity. The study expounds the experimental operation and data processing methods of low temperature Raman spectroscopy and clarifies its fluid inclusion in the fluid. Although the operation process is rather complicated, it has strong anti-interference, wide range of application salinity and reliable calculation results. It is an important method for salt measurement.
【作者单位】：山东科技大学地球科学与工程学院;国土资源部金矿成矿过程与资源利用重点实验室(山东省地质科学研究院);
【基金】：国家自然科学基金项目(41372108) 山东省自然科学基金项目(ZR2016DP02) 山东省高等学校科技计划项目(J15LH05) 国土资源部金矿成矿过程与资源利用重点实验室项目(2013004) 山东科技大学科研创新团队支持计划项目(2015TDJH101)资助
【分类号】：O657.37;P624

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