Barite geochemistry from hydrothermal chimneys of the Okinawa Trough: insight into chimney formation and fluid/sediment interaction

  title={Barite geochemistry from hydrothermal chimneys of the Okinawa Trough: insight into chimney formation and fluid/sediment interaction},
  author={Takuroh Noguchi and Ryuichi Shinjo and Michihiro Ito and Jitsuya Takada and Tamotsu Oomori},
  journal={Journal of Mineralogical and Petrological Sciences},
We present 210Pb/226Ra and 87Sr/86Sr data of barite separates from mineralized hydrothermal sulfate-sulfide chimneys collected from two young and active back-arc basins (i.e., Okinawa Trough and southern Mariana Trough), to examine the age of chimney formation and the relationship between the fluid chemistry and the field occurrence. Precipitation ages of purified barites in the mineralized chimneys are 24.8 (±1.3)-73.9 (±13.6) years BP2005 for chimney #220 from the Hakurei site in the Izena… 

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