CHEN Daigeng, ZENG Zhigang, ZHAI Bin, YIN Xuebo, ZHANG Guoliang, OUYANG Hegen. POURBAIX DIAGRAMS AND GEOLOGICAL IMPLICATIONS OF Fe-S-H2O HYDROTHERMAL SYSTEM NEAR 13°N ON THE EAST PACIFIC RISE[J]. Marine Geology & Quaternary Geology, 2010, 30(2): 9-15. DOI: 10.3724/SP.J.1140.2010.02009
Citation: CHEN Daigeng, ZENG Zhigang, ZHAI Bin, YIN Xuebo, ZHANG Guoliang, OUYANG Hegen. POURBAIX DIAGRAMS AND GEOLOGICAL IMPLICATIONS OF Fe-S-H2O HYDROTHERMAL SYSTEM NEAR 13°N ON THE EAST PACIFIC RISE[J]. Marine Geology & Quaternary Geology, 2010, 30(2): 9-15. DOI: 10.3724/SP.J.1140.2010.02009
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POURBAIX DIAGRAMS AND GEOLOGICAL IMPLICATIONS OF Fe-S-H2O HYDROTHERMAL SYSTEM NEAR 13°N ON THE EAST PACIFIC RISE

  • 1 Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;

  • 2 Graduate University of Chinese Academy of Sciences, Beijing 100049, China;

  • 3 Key Laboratory of Marine Hydrocarbon Resource and Geology, Ministry of Land and Resources, Qingdao Institute of Marine Geology, Qingdao 266071, China

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  • Received Date: November 11, 2009
  • Revised Date: January 04, 2010
    Graphical Abstract
    • Abstract
  • Pourbaix diagrams of Fe-S-H2O hydrothermal system near 13°N on the East Pacific Rise were drawn by use of thermodynamic calculations, which illustrated changes of stable fields of predominant mineral (pyrite) in sulfide during changes from high temperatures to low temperatures of hydrothermal fluids which formed the sulfide. Mineral assemblages and chemical compositions were taken into account in computational processes. On the basis of combination with existing research on dynamic experiments and sulfur isotope fractionation, potential chemical reaction pathways which formed the predominant mineral (i.e., pyrite) during marine hydrothermal activities which precipitated sulfides were brought out. Moreover, it is suggested that the formation mechanism of pyrite in the hydrothermal system near 13°N on the East Pacific Rise has changed when hydrothermal fluids which form the sulfide change from high temperatures (>200℃) to low temperatures (25~200℃).
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    • References (33)
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