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H2S在海底热液喷口流体中的浓度数据统计及探测技术进展
马媛媛,蒋磊,辛洋
1.浙江大学;2.中国科学院深海科学与工程研究所;3.中国科学院大学
摘要:
H2S在海底热液中广泛分布,约束着海底金属矿床的形成以及热液喷口生物圈的演化。近几十年来,随着海底勘探和海底科考的不断深入,前人对喷口热液流体进行了大量的采样分析研究,其中热液流体样品主要由非气密采样器和气密不保压采样器取得。本文统计了全球38个热液活动区264个热液喷口流体样品中的H2S浓度数据,结果表明H2S浓度主要受到岩浆去气、水岩反应、相分离作用影响。值得注意的是广泛使用的非气密保压采样技术不能反映原始喷口流体状态和化学组成,可能会造成H2S浓度测量误差。为了提高数据的精度,一方面需要进一步发展气密保压采样技术,以提高样品的保真水平;另一方面利用深海原位电化学传感器或拉曼光谱系统进行海底原位探测也将是一个重要的发展方向。
关键词:  海底热液喷口  H2S浓度  气密采样器  原位探测
DOI:10.11759/hykx20190311002
分类号:
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
Concentration statistics and detection technology of H2S in Submarine hydrothermal vent fluids
Ma Yuanyuan1,2, Jiang Lei2, Xin Yang3,4
1.Zhejiang University;2.Institute of Deep-Sea Science and Engineering, Chinese Academy of Sciences;3.Institute of Deep Sea Science and Engineering, Chinese Academy of Sciences;4.University of Chinese Academy of Sciences
Abstract:
The distribution of H2S in Submarine hydrothermal fluids widely constrains the formation of metal deposits and the evolution of hydrothermal vent biosphere. In recent decades, with the deepening of Submarine exploration and science research, lots of sampling and analysis researches have been done, while the hydrothermal fluid samples are mainly obtained by non gas-tight samplers and gas-tight samplers. Based on previous researches, we have collected 264 H2S concentrations of hydrothermal vent fluids from 38 hydrothermal fields around the world,indicating that H2S concentrations are mainly affected by magma degassing, water-rock reaction and phase separation. It is worth noting that the widely used non gas-tight pressure-retaining sampling technology can’t reflect the state and chemical composition of original hydrothermal vent fluids, may cause H2S concentration measurement errors. In order to improve the precision of the data, on the one hand, it is necessary to develop the pressure-retaining gas-tight sampler to improve the trueness of the samples. On the other hand, the application of deep-sea in-situ electrochemical sensors or Raman spectroscopy system for in-situ detection will also be an important developing direction.
Key words:  hydrothermal fluids  H2S concentration  gas-tight sampler  in-situ detection
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