2014/11/08 by Taisei Fujiwara, Shin Toyoda, Ai Uchida +3 · 1 citation
Earth and Planetary Sciences · Arts and Humanities · Physics and Astronomy · #Mineralogy and Gemology Studies #Cultural Heritage Materials Analysis #X-ray Spectroscopy and Fluorescence Analysis #Hydrothermal circulation #Geology #Trough (economics) #Geochemistry #Mineralogy #Paleontology
paper · pdf · doi:10.1007/978-4-431-54865-2_29
openalex publication_date 2014/11/08 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/04
ESR (electron spin resonance) ages were determined for barite crystals extracted from hydrothermal sulfide deposits taken at Daiyon-Yonaguni Knoll field, Hatoma Knoll field, Iheya North Knoll field, Hakurei Site of Izena Hole field, Yoron Hole field of the Okinawa Trough. The ages range from 4.1 to 16,000 years, being consistent with detection of 228 Ra in younger samples and radioactive equilibrium/disequilibrium between radium and daughter nuclei. The variation of the ages within each sample is mostly within the statistical error range. The relative order of the ages is consistent with the result of 226 Ra- 210 Pb method, but the determining absolute ages is still an issue. The order of ages of the 5 hydrothermal fields would be arranged, from young to old as follows; Yoron Hole field, Daiyon-Yonaguni Knoll field, Hatoma Knoll field, being nearly equal to Iheya North Knoll field.