IOCAS-IR  > 海洋地质与环境重点实验室
Thesis Advisor张鑫
Degree Grantor中国科学院大学
Place of Conferral中国科学院海洋研究所
Degree Name工程硕士
Degree Discipline环境工程
Keyword原位探测 热液流体 拉曼光谱 氯度 O-H伸缩振动峰

(3)冲绳海槽中部的伊是名海洼(Izena Hole)的Jade和Hakurei热液区受到了相分离作用影响。该区域原位的拉曼光谱数据反演的氯度均高于周围海水的氯度,这与前人对此区域的研究结果十分吻合,表明了该区域有可能受到了相分离作用的影响。

Other Abstract

The degree of chlorinity of deep-sea hydrothermal fluids is one of the important indicators of deep-sea hydrothermal fluids, and it is indicative of the deep phase separation degree of deep-sea hydrothermal fluids and the process of water/rock reaction. However, in-situ accurate measurement of the chlorination of deep-sea hydrothermal fluids still faces major challenges. The laser Raman spectroscopy technology, known as "Molecular Fingerprinting", can be used to qualitatively and quantitatively analyze the substances to be tested in aqueous solutions. It has the advantages of fast and non-destructive, no sample preparation, and flexible sampling. It is suitable for conducting laboratory high-temperature and high-pressure simulation research and deep sea In-situ detection work in extreme environments. In this paper, based on the O-H stretching vibration peak of water, a segmented quantitative model suitable for measuring the chlorinity degree of high-temperature solutions was established through laboratory simulation and verified in-situ in the deep sea. Based on the above research, the following conclusions can be obtained:
(1) At different temperatures, the degree of chlorinity has different effects on the O-H stretching vibration peak of water. In the temperature range of 0-50°C, RSpeak1 (frequency shift of strong hydrogen bond peak) changes greatly with the degree of chlorine. In the temperature range of 50-200°C, PAR (peak area of strong hydrogen bond/peak area of weak hydrogen bond) varies greatly with the degree of chlorine. In the temperature range of 200-300°C, F (frequency shift parameter) varies greatly with the degree of chlorine.
(2) Establish a quantitative model of chlorinity degree suitable for high-temperature solutions according to the temperature division interval. Based on the relationship between the characteristics of the Raman spectrum and the chlorinity degree of the aqueous solution, RSpeak1 (frequency shift of strong hydrogen bond peak), RSpeak2 (frequency shift of weak hydrogen bond peak), PAR (peak area of strong hydrogen bond/weak hydrogen bond peak area) and F can be established. (Frequency shift parameter) The chlorinity quantitative model as the dependent variable. According to the functional characteristics of these four quantitative models in different temperature intervals, a piecewise function chlorinity quantitative model can be established according to the temperature division interval, and its accuracy is 96.20%.Compared with the chlorinity quantitative model established based on a single parameter, the accuracy of the chlorinity quantitative model is improved by about 4.83-12.33%.
(3) The Jade and Hakurei hydrothermal areas of Izena Hole in the middle of the Okinawa Trough were affected by phase separation. The chlorinity retrieved from in-situ Raman spectroscopy data in this area is all higher than the chlorinity retrieved from the surrounding cold sea water, which is in good agreement with previous research results in this area, indicating that this area may be subject to phase separation.

Document Type学位论文
Recommended Citation
GB/T 7714
葛蒙. 深海高温热液流体氯度的激光拉曼光谱原位定量分析技术[D]. 中国科学院海洋研究所. 中国科学院大学,2021.
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