Rare-earth, major, and trace element geochemistry of deep-sea sediments in the Indian Ocean: Implications for the potential distribution of REY-rich mud in the Indian Ocean
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- Yasukawa Kazutaka
- Department of Systems Innovation, School of Engineering, The University of Tokyo
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- Nakamura Kentaro
- Department of Systems Innovation, School of Engineering, The University of Tokyo Research and Development Center for Submarine Resources, Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
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- Fujinaga Koichiro
- Frontier Research Center for Energy and Resources, School of Engineering, The University of Tokyo
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- Machida Shiki
- Research and Development Center for Submarine Resources, Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
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- Ohta Junichiro
- Department of Systems Innovation, School of Engineering, The University of Tokyo
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- Takaya Yutaro
- Department of Resources and Environmental Engineering, School of Creative Science and Engineering, Waseda University
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- Kato Yasuhiro
- Department of Systems Innovation, School of Engineering, The University of Tokyo Research and Development Center for Submarine Resources, Japan Agency for Marine-Earth Science and Technology (JAMSTEC) Frontier Research Center for Energy and Resources, School of Engineering, The University of Tokyo
Bibliographic Information
- Other Title
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- The chemical composition of subducting sediment and its consequences for the crust and mantle
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Abstract
We analyzed 1338 deep-sea sediment samples from 19 Deep Sea Drilling Project/Ocean Drilling Program sites covering a large portion of the Indian Ocean, and constructed a new and comprehensive data set of their bulk chemical compositions, including rare-earth, major, and trace elements. The bulk-sediment rare-earth and yttrium (REY) composition of the REY-enriched samples, characterized by relatively small negative Ce anomalies, almost no Y anomalies, and enrichment in heavy rare-earth elements, can be interpreted as the superposition of the REY compositions of apatite and hydrogenous Fe-Mn oxides. Although the hydrothermal component is a key factor in the formation of REY-rich mud in the Pacific Ocean, it is less important in the Indian Ocean, probably because there is less hydrothermal input of Fe-oxyhydroxides from seafloor hydrothermal vents there. The relationships among Fe2O3, MnO, P2O5, Co, and total REY contents suggest that a primary factor controlling REY enrichment in deep-sea sediments is the sedimentation rate. A low sedimentation rate allows both fish debris apatite and hydrogenous Fe-Mn (oxyhydr)oxides to accumulate in the surface sediments. On the basis of these results, we identified two potential areas in the Indian Ocean where REY-rich mud may be present in surface sediments: the south-southeastern Wharton Basin and the southern Central Indian Ocean Basin. The resource potential of the latter area might be particularly high if the distributions of REY-rich mud and Fe-Mn nodule fields broadly overlap.
Journal
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- GEOCHEMICAL JOURNAL
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GEOCHEMICAL JOURNAL 49 (6), 621-635, 2015-11-26
GEOCHEMICAL SOCIETY OF JAPAN
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Details 詳細情報について
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- CRID
- 1390001204554245376
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- NII Article ID
- 130005112464
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- NII Book ID
- AA00654975
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- ISSN
- 18805973
- 00167002
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- NDL BIB ID
- 026964784
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
- KAKEN
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- Abstract License Flag
- Disallowed