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Evaluation of mineral resource potential of rare-earth elements and yttrium-rich mud off the southeastern coast of Hawaiian Islands
ハワイ南東方沖におけるレアアース泥の資源ポテンシャル評価

大田, 隼一郎 ; 藤永, 公一郎 ; 髙谷, 雄太郎 ; 加藤, 泰浩 ; Ohta, Junichiro ; Fujinaga, Koichiro ; Takaya, Yutaro ; Kato, Yasuhiro

資源地質, 2012, Vol.62(3), pp.197-209 [Tạp chí có phản biện]

ISSN: 0918-2454 ; DOI: 10.11456/shigenchishitsu.62.197

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  • Evaluation of mineral resource potential of rare-earth elements and yttrium-rich mud off the southeastern coast of Hawaiian Islands

  • Nhan đề:
    ハワイ南東方沖におけるレアアース泥の資源ポテンシャル評価
  • Tác giả: 大田, 隼一郎 ; 藤永, 公一郎 ; 髙谷, 雄太郎 ; 加藤, 泰浩 ; Ohta, Junichiro ; Fujinaga, Koichiro ; Takaya, Yutaro ; Kato, Yasuhiro
  • Chủ đề: rare earth elements (REEs) ; REY-rich mud ; REY resource ; potential evaluation ; deep-sea mineral resource ; hydrothermal sediment ; Rare Earth Elements (Rees) ; Rey-Rich Mud ; Rey Resource ; Potential Evaluation ; Deep-Sea Mineral Resource ; Hydrothermal Sediment
  • Là 1 phần của: 資源地質, 2012, Vol.62(3), pp.197-209
  • Mô tả: We report bulk-sediment compositions of rare-earth elements and yttrium (REY), major and trace elements for “REY-rich mud” from 6 drill cores obtained by Ocean Drilling Program (Site 1215A, 1216A, 1217A, 1218A, 1220A and 1222A) off the southeastern coast of Hawaiian Islands. The REY-rich mud in study area has high REY contents, 400-1,178 ppm total REY (ΣREY), which are comparable to those of ion-absorption-type REY deposits in southern China. The core profiles indicate that the REY-rich mud has accumulated to thicknesses of 25-70 m. Some portions of REY-rich mud are typically enriched in Fe2O3, and their post-Archean average Australian shale (PAAS)-normalized REE patterns show strikingly negative Ce anomalies with the same magnitude of seawater. These geochemical characteristics are similar to those of modern hydrothermal Fe-rich sediments near the East Pacific Rise. This indicates that one of the main hosts for REY in the mud is a Fe-oxyhydroxide precipitate from hydrothermal plumes that has taken up REY from ambient seawater. On the other hand, the correlation diagram between ΣREY and Fe2O3 shows another ΣREY enrichment trend characterized by relatively low Fe contents, which infers an existence of the second REY-rich component. As the REY-rich samples on this trend contain significant amounts of phillipsite, the second REY-rich component is considered to be phillipsite. Here we estimate that a volume of 1 km2 × Maximum Cumulated Concentration Depth (MCCD; in metric unit), which represents an appropriate mining depth, at Site 1222A holds nearly 12,200 t (14,000 tREO), which could provide one-tenth of the current annual world consumption of REY. We conclude that deep-sea REY-rich mud off the southeastern coast of Hawaiian Islands has a potential as a new mineral resource for REY.
  • Ngôn ngữ: Japanese
  • Số nhận dạng: ISSN: 0918-2454 ; DOI: 10.11456/shigenchishitsu.62.197

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