Advances in Earth Science ›› 2000, Vol. 15 ›› Issue (3): 307-312. doi: 10.11867/j.issn.1001-8166.2000.03.0307

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RARE EARTH ELEMENTS COMPOSITIONS OF HIGH-TEMPERATURE HYDROTHERMAL FLUIDS IN SEA FLOOR AND CONTROL FACTORS

DING Zhenju ①②, LIU Congqiang , YAO Shuzhen , ZHOU Zonggui   

  1. (①Institute of Geochemistry,Chinese Academy of Sciences,Guiyang550002China)
    (②China University of Geosciences,Wuhan 430074,China)
  • Received:1999-06-21 Revised:1999-11-11 Online:2000-06-01 Published:2000-06-01

DING Zhenju, LIU Congqiang, YAO Shuzhen, ZHOU Zonggui. RARE EARTH ELEMENTS COMPOSITIONS OF HIGH-TEMPERATURE HYDROTHERMAL FLUIDS IN SEA FLOOR AND CONTROL FACTORS[J]. Advances in Earth Science, 2000, 15(3): 307-312.

It is very important to study the behavior and control factors of rare earth elements in fluids for applying them to tracing of the geochemical processes. The REE compositions of the vent fluid show wide contents in concentration but similar on the REE distribution patterns among different seafloor hydrothermal system with various setting and rocks. The distribution patterns common possess high positive Eu anomalies and enriched LREE. The composition of the fluids is related to alteration and texture of rock or mineral and is controlled by environment conditions such as temperature, pressure, pH, Eh,complexing agents. The distribution patterns of high temperature fluids are the results of sorption,complexation, and mineral deposit process and the REE patterns were adjusted and redistributed during fluid circulation and migration. Some REE' s parameters such as Eu, Ce anomalies and Y/Ho ratios can be used to study processes concerning fluid. For example, the positive Eu anomalies, negative Ce anomalies and Y/Ho ratios as mark of involving high-temperature fluid and sea water may be used to trace geochemical processes concerning on mixing.

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