Zinc isotopic evidence for recycled carbonate in the deep mantle.

Zhang, Xiao-Yu; Chen, Li-Hui; Wang, Xiao-Jun; Hanyu, Takeshi; Hofmann, Albrecht W; Komiya, Tsuyoshi; Nakamura, Kentaro; Kato, Yasuhiro; Zeng, Gang; Gou, Wen-Xian; Li, Wei-Qiang

Zhang, Xiao-Yu; Chen, Li-Hui; Wang, Xiao-Jun; Hanyu, Takeshi; Hofmann, Albrecht W; Komiya, Tsuyoshi; Nakamura, Kentaro; Kato, Yasuhiro; Zeng, Gang; Gou, Wen-Xian; Li, Wei-Qiang.

Afiliación

Zhang XY; School of Earth Sciences and Engineering, State Key Laboratory for Mineral Deposits Research, Nanjing University, Nanjing, 210023, China.
Chen LH; School of Earth Sciences and Engineering, State Key Laboratory for Mineral Deposits Research, Nanjing University, Nanjing, 210023, China. chenlh@nwu.edu.cn.
Wang XJ; Department of Geology, State Key Laboratory of Continental Dynamics, Northwest University, Xi'an, 710069, China. chenlh@nwu.edu.cn.
Hanyu T; Department of Geology, State Key Laboratory of Continental Dynamics, Northwest University, Xi'an, 710069, China.
Hofmann AW; Research Institute for Marine Geodynamics, Japan Agency for Marine-Earth Science and Technology, Yokosuka, 237-0061, Japan.
Komiya T; Abteilung Klimageochemie, Max-Planck-Institut für Chemie, D-55128, Mainz, Germany.
Nakamura K; Department of Earth Science and Astronomy, The University of Tokyo, Tokyo, 153-8902, Japan.
Kato Y; Department of Systems Innovation, School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo, 113-8656, Japan.
Zeng G; Department of Systems Innovation, School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo, 113-8656, Japan.
Gou WX; School of Earth Sciences and Engineering, State Key Laboratory for Mineral Deposits Research, Nanjing University, Nanjing, 210023, China.
Li WQ; School of Earth Sciences and Engineering, State Key Laboratory for Mineral Deposits Research, Nanjing University, Nanjing, 210023, China.

Nat Commun ; 13(1): 6085, 2022 Oct 14.

Article en En | MEDLINE | ID: mdl-36241628

RESUMEN

Carbonate, the major carbon reservoir on Earth's surface, can enter into the mantle by subduction. However, evidence for recycled surficial carbonates in the deep mantle is still scarce. Ocean island basalts from Cook-Austral islands and St. Helena Island, widely called HIMU basalts because of their high µ = 238U/204Pb sources, are thought to be fed by mantle plumes originating in the lower mantle. Here we report exceptionally high Î´66Zn values (Î´66Zn = 0.38 ± 0.03) of these HIMU lavas relative to most published data for oceanic basalts (Î´66Zn = 0.31 ± 0.10), which requires a source contributed by isotopically heavy recycled surficial carbonates. During subduction of the oceanic lithosphere, melting of mixed surficial carbonates and basaltic crust in the deep mantle generates carbonatite melts, which metasomatizes the nearby mantle and the resultant carbonated mantle ultimately evolves into a high-Î´66Zn HIMU source. High-Î´66Zn signatures of HIMU basalts, therefore, demonstrate that carbonates can be transported into Earth's deep mantle.

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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Nat Commun Asunto de la revista: BIOLOGIA / CIENCIA Año: 2022 Tipo del documento: Article País de afiliación: China Pais de publicación: Reino Unido

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