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Molybdenum isotopic evidence for the initiation of a big mantle wedge beneath eastern Asia.

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Title: Molybdenum isotopic evidence for the initiation of a big mantle wedge beneath eastern Asia.
Authors: Fang, Wei1 (AUTHOR), Dai, Li-Qun1,2 (AUTHOR) lqdai@ustc.edu.cn, Zhao, Zi-Fu1,2 (AUTHOR), Chen, Qi1,2 (AUTHOR), Yan, Jun3 (AUTHOR), Zhang, Dayu3 (AUTHOR), Jiang, Ding-Sheng1,2 (AUTHOR)
Source: Chemical Geology. Sep2024, Vol. 662, pN.PAG-N.PAG. 1p.
Subjects: Slabs (Structural geology), Mafic rocks, Subduction zones, Wedges, Subduction, Molybdenum, Geodynamics, Igneous rocks
Geographic Terms: Asia
Abstract: The subduction of the Paleo-Pacific plate and the formation of a big mantle wedge have influenced the tectonic-magmatic evolution of eastern Asia. However, the timing and mechanism of big mantle wedge formation remain obscure. Here we report molybdenum (Mo) isotope compositions of Mesozoic-Cenozoic mafic rocks in eastern China, which provide constraints on the geodynamics of Paleo-Pacific subduction. The >125 Ma rocks have high δ98Mo values of −0.27‰ to 0.17‰ and arc-like features, whereas the <125 Ma rocks have low δ98Mo values of −0.67‰ to −0.04‰ and ocean-island basalt (OIB)-like features. The mantle sources of these two types of rocks contain subducted Paleo-Pacific slab components at sub-arc and mantle transition zone depths, respectively. Therefore, the Paleo-Pacific subduction involves shallow subduction yielding a small mantle wedge in the early stage and deep subduction yielding a big mantle wedge in the late stage. The dramatic change in Mo isotopes reveals that the big mantle wedge beneath eastern Asia was initiated at ∼125 Ma. [ABSTRACT FROM AUTHOR]
Copyright of Chemical Geology is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
An: 178421510
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  Data: Molybdenum isotopic evidence for the initiation of a big mantle wedge beneath eastern Asia.
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  Label: Abstract
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  Data: The subduction of the Paleo-Pacific plate and the formation of a big mantle wedge have influenced the tectonic-magmatic evolution of eastern Asia. However, the timing and mechanism of big mantle wedge formation remain obscure. Here we report molybdenum (Mo) isotope compositions of Mesozoic-Cenozoic mafic rocks in eastern China, which provide constraints on the geodynamics of Paleo-Pacific subduction. The &gt;125 Ma rocks have high δ98Mo values of −0.27‰ to 0.17‰ and arc-like features, whereas the &lt;125 Ma rocks have low δ98Mo values of −0.67‰ to −0.04‰ and ocean-island basalt (OIB)-like features. The mantle sources of these two types of rocks contain subducted Paleo-Pacific slab components at sub-arc and mantle transition zone depths, respectively. Therefore, the Paleo-Pacific subduction involves shallow subduction yielding a small mantle wedge in the early stage and deep subduction yielding a big mantle wedge in the late stage. The dramatic change in Mo isotopes reveals that the big mantle wedge beneath eastern Asia was initiated at ∼125 Ma. [ABSTRACT FROM AUTHOR]
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  Data: &lt;i&gt;Copyright of Chemical Geology is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder&#39;s express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.&lt;/i&gt; (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.1016/j.chemgeo.2024.122244
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Slabs (Structural geology)
        Type: general
      – SubjectFull: Mafic rocks
        Type: general
      – SubjectFull: Subduction zones
        Type: general
      – SubjectFull: Wedges
        Type: general
      – SubjectFull: Subduction
        Type: general
      – SubjectFull: Molybdenum
        Type: general
      – SubjectFull: Geodynamics
        Type: general
      – SubjectFull: Igneous rocks
        Type: general
      – SubjectFull: Asia
        Type: general
    Titles:
      – TitleFull: Molybdenum isotopic evidence for the initiation of a big mantle wedge beneath eastern Asia.
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            NameFull: Fang, Wei
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            NameFull: Dai, Li-Qun
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            NameFull: Zhao, Zi-Fu
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            NameFull: Chen, Qi
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            NameFull: Zhang, Dayu
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            – D: 10
              M: 09
              Text: Sep2024
              Type: published
              Y: 2024
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              Value: 00092541
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              Value: 662
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            – TitleFull: Chemical Geology
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