Geochemical characteristics and origin of the HIMU reservoir

A possible mantle plume source in the lower mantle

Takeshi Hanyu, Yoshiyuki Tatsumi, Ryoko Senda, Takashi Miyazaki, Qing Chang, Yuka Hirahara, Toshiro Takahashi, Hiroshi Kawabata, Katsuhiko Suzuki, Jun Ichi Kimura, Shun'Ichi Nakai

研究成果: ジャーナルへの寄稿記事

68 引用 (Scopus)

抄録

Combined Pb-Sr-Nd-Hf-Os isotopes, together with major and trace element compositions, were determined from clinopyroxene and olivine phenocrysts, along with whole rocks, for ocean island basalts with high μ(μ = 238U/204Pb) (HIMU) and enriched mantle isotopic characteristics from Cook-Austral Islands. Clinopyroxene and olivine separates record reliable isotopic information of the sources because of minimized in situ radiogenic ingrowth and their lower susceptibility to crustal contamination. Coherent isotopic systematics in multi-isotope spaces defined by the HIMU samples are best explained by recent mixing of melts derived from the HIMU reservoir and the local shallow mantle. The isotopic compositions of the HIMU reservoir are constrained to be low εNd (≤+4), low εHf (≤+3), and moderately radiogenic 187Os/ 188Os (0.14-0.15) in association with radiogenic Pb isotopes ( 206Pb/204Pb ≥21.5). Since ancient oceanic crust would have had exceptionally radiogenic 187Os/188Os, moderately high 187Os/188Os precludes recycled oceanic crust as the only contributor to the HIMU reservoir. Instead, mantle metasomatized with partial melts from subducted oceanic crust is a likely candidate for the HIMU reservoir. Moreover, partial melting of oceanic crust in equilibrium with Mg perovskite would fractionate U/Pb, Sm/Nd, and Lu/Hf, which are in accordance with the time-integrated U/Pb, Sm/Nd, and Lu/Hf deduced from Pb, Nd, and Hf isotopic compositions of the HIMU reservoir, respectively, with a formation age of 2-3 Ga. We thus propose that the HIMU reservoir was formed by hybridization of a subducted oceanic crust-derived melt with the ambient mantle and then stored for several billion years in the lower mantle.

元の言語英語
記事番号Q0AC09
ジャーナルGeochemistry, Geophysics, Geosystems
12
発行部数2
DOI
出版物ステータス出版済み - 3 1 2012
外部発表Yes

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lower mantle
mantle plume
Isotopes
plumes
Earth mantle
oceanic crust
crusts
Chemical analysis
mantle
isotopes
Trace Elements
melt
isotope
olivine
clinopyroxene
Melting
isotopic composition
Contamination
Rocks
Association reactions

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology

これを引用

Geochemical characteristics and origin of the HIMU reservoir : A possible mantle plume source in the lower mantle. / Hanyu, Takeshi; Tatsumi, Yoshiyuki; Senda, Ryoko; Miyazaki, Takashi; Chang, Qing; Hirahara, Yuka; Takahashi, Toshiro; Kawabata, Hiroshi; Suzuki, Katsuhiko; Kimura, Jun Ichi; Nakai, Shun'Ichi.

:: Geochemistry, Geophysics, Geosystems, 巻 12, 番号 2, Q0AC09, 01.03.2012.

研究成果: ジャーナルへの寄稿記事

Hanyu, T, Tatsumi, Y, Senda, R, Miyazaki, T, Chang, Q, Hirahara, Y, Takahashi, T, Kawabata, H, Suzuki, K, Kimura, JI & Nakai, SI 2012, 'Geochemical characteristics and origin of the HIMU reservoir: A possible mantle plume source in the lower mantle', Geochemistry, Geophysics, Geosystems, 巻. 12, 番号 2, Q0AC09. https://doi.org/10.1029/2010GC003252
Hanyu, Takeshi ; Tatsumi, Yoshiyuki ; Senda, Ryoko ; Miyazaki, Takashi ; Chang, Qing ; Hirahara, Yuka ; Takahashi, Toshiro ; Kawabata, Hiroshi ; Suzuki, Katsuhiko ; Kimura, Jun Ichi ; Nakai, Shun'Ichi. / Geochemical characteristics and origin of the HIMU reservoir : A possible mantle plume source in the lower mantle. :: Geochemistry, Geophysics, Geosystems. 2012 ; 巻 12, 番号 2.
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abstract = "Combined Pb-Sr-Nd-Hf-Os isotopes, together with major and trace element compositions, were determined from clinopyroxene and olivine phenocrysts, along with whole rocks, for ocean island basalts with high μ(μ = 238U/204Pb) (HIMU) and enriched mantle isotopic characteristics from Cook-Austral Islands. Clinopyroxene and olivine separates record reliable isotopic information of the sources because of minimized in situ radiogenic ingrowth and their lower susceptibility to crustal contamination. Coherent isotopic systematics in multi-isotope spaces defined by the HIMU samples are best explained by recent mixing of melts derived from the HIMU reservoir and the local shallow mantle. The isotopic compositions of the HIMU reservoir are constrained to be low εNd (≤+4), low εHf (≤+3), and moderately radiogenic 187Os/ 188Os (0.14-0.15) in association with radiogenic Pb isotopes ( 206Pb/204Pb ≥21.5). Since ancient oceanic crust would have had exceptionally radiogenic 187Os/188Os, moderately high 187Os/188Os precludes recycled oceanic crust as the only contributor to the HIMU reservoir. Instead, mantle metasomatized with partial melts from subducted oceanic crust is a likely candidate for the HIMU reservoir. Moreover, partial melting of oceanic crust in equilibrium with Mg perovskite would fractionate U/Pb, Sm/Nd, and Lu/Hf, which are in accordance with the time-integrated U/Pb, Sm/Nd, and Lu/Hf deduced from Pb, Nd, and Hf isotopic compositions of the HIMU reservoir, respectively, with a formation age of 2-3 Ga. We thus propose that the HIMU reservoir was formed by hybridization of a subducted oceanic crust-derived melt with the ambient mantle and then stored for several billion years in the lower mantle.",
author = "Takeshi Hanyu and Yoshiyuki Tatsumi and Ryoko Senda and Takashi Miyazaki and Qing Chang and Yuka Hirahara and Toshiro Takahashi and Hiroshi Kawabata and Katsuhiko Suzuki and Kimura, {Jun Ichi} and Shun'Ichi Nakai",
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AU - Hanyu, Takeshi

AU - Tatsumi, Yoshiyuki

AU - Senda, Ryoko

AU - Miyazaki, Takashi

AU - Chang, Qing

AU - Hirahara, Yuka

AU - Takahashi, Toshiro

AU - Kawabata, Hiroshi

AU - Suzuki, Katsuhiko

AU - Kimura, Jun Ichi

AU - Nakai, Shun'Ichi

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