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ESR, 226Ra-210Pb and 228Ra-228Th Dating of Barite in Sea-Floor Hydrothermal Sulfide Deposits in the Okinawa Trough
https://repo.qst.go.jp/records/71605
https://repo.qst.go.jp/records/716058ea16843-3d81-45c3-b66d-7578d659f98c
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2015-04-20 | |||||
| タイトル | ||||||
| タイトル | ESR, 226Ra-210Pb and 228Ra-228Th Dating of Barite in Sea-Floor Hydrothermal Sulfide Deposits in the Okinawa Trough | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_c94f | |||||
| 資源タイプ | conference object | |||||
| アクセス権 | ||||||
| アクセス権 | metadata only access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
| 著者 |
Fujiwara, Taisei
× Fujiwara, Taisei× Toyoda, Shin× Uchida, Ai× Ishibashi, Jun-Ichiro× Nakai, Shun'ichi× Takamasa, Asako× 賞雅 朝子 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | ESR (electron spin resonance) dating method has been applied to calcite, aragonite, hydroxyapatite, quartz and gypsum. Recently it was shown that this method is also practically applicable to barite, especially those in sea-floor hydrothermal sulfide deposits (Takamasa et al., 2013). ESR, 226Ra- 210Pb, and 228Ra- 228Th ages were determined for barite crystals extracted from hydrothermal sulfide deposits taken at hydrothermal fields at the Okinawa Trough. The ages range 4.1 to 16000 years where the ages obtained by the three methods coincide in some of the samples while the 228Ra- 228Th ages are the youngest and ESR ages, the oldest and the 226Ra- 210Pb ages in between in the other samples. The samples with younger ESR ages show younger 226Ra- 210Pb ages and those with older ESR ages show older 226Ra- 210Pb ages with no detection of 228Ra. The inconsistency of the ages between these methods would be explained by the mixture of the barite crystals with younger and older ages, formed by several hydrothermal activities. 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． |
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| 会議概要（会議名, 開催地, 会期, 主催者等） | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | Goldschmidt2014 | |||||
| 発表年月日 | ||||||
| 日付 | 2014-06-12 | |||||
| 日付タイプ | Issued | |||||
