Formation of Continental Crust by Diapiric Melting of Recycled Crustal Materials in the Mantle Wedge
Abstract The compositional similarity between high‐Mg andesite‐dacite from accretionary orogens and bulk continental crust (CC) provides an opportunity to unravel the CC formation paradox. Compositional data from a global compilation of Quaternary magmatic arcs indicate the presence of low‐Mg series...
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| Format: | Article |
| Language: | English |
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Wiley
2022-08-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2021GL097515 |
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| author | Shi‐Min Li Qing Wang Di‐Cheng Zhu Peter A. Cawood Robert J. Stern Zhidan Zhao |
| author_facet | Shi‐Min Li Qing Wang Di‐Cheng Zhu Peter A. Cawood Robert J. Stern Zhidan Zhao |
| author_sort | Shi‐Min Li |
| collection | DOAJ |
| description | Abstract The compositional similarity between high‐Mg andesite‐dacite from accretionary orogens and bulk continental crust (CC) provides an opportunity to unravel the CC formation paradox. Compositional data from a global compilation of Quaternary magmatic arcs indicate the presence of low‐Mg series (LMS) and high‐Mg series (HMS). The LMS show trends of crystal fractionation and can be subdivided into high Ba/Th and high La/Sm groups, which likely originate from fluid‐ and sediment melt‐modified mantle wedge, respectively. In contrast, the HMS have variably mixed compositions (e.g., high Mg#, Ba/Th, and La/Sm) and can be explained by partial melting of mélange diapirs rising into the mantle wedge, which are mixtures of subducted sediment, eroded arc crust or CC, buoyant oceanic crust, and peridotite. We, therefore, propose a two‐step process for creating CC involving extraction of LMS from the mantle followed by re‐melting of recycled LMS in the mantle to generate HMS and thus CC. |
| format | Article |
| id | doaj-art-4bd93023d2ab4f9a9b53037c5d71bca2 |
| institution | OA Journals |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2022-08-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-4bd93023d2ab4f9a9b53037c5d71bca22025-08-20T02:11:38ZengWileyGeophysical Research Letters0094-82761944-80072022-08-014915n/an/a10.1029/2021GL097515Formation of Continental Crust by Diapiric Melting of Recycled Crustal Materials in the Mantle WedgeShi‐Min Li0Qing Wang1Di‐Cheng Zhu2Peter A. Cawood3Robert J. Stern4Zhidan Zhao5State Key Laboratory of Geological Processes and Mineral Resources, and School of Earth Science and Resources China University of Geosciences Beijing ChinaState Key Laboratory of Geological Processes and Mineral Resources, and School of Earth Science and Resources China University of Geosciences Beijing ChinaState Key Laboratory of Geological Processes and Mineral Resources, and School of Earth Science and Resources China University of Geosciences Beijing ChinaSchool of Earth, Atmosphere & Environment Monash University Melbourne VIC AustraliaGeosciences Department University of Texas at Dallas Richardson TX USAState Key Laboratory of Geological Processes and Mineral Resources, and School of Earth Science and Resources China University of Geosciences Beijing ChinaAbstract The compositional similarity between high‐Mg andesite‐dacite from accretionary orogens and bulk continental crust (CC) provides an opportunity to unravel the CC formation paradox. Compositional data from a global compilation of Quaternary magmatic arcs indicate the presence of low‐Mg series (LMS) and high‐Mg series (HMS). The LMS show trends of crystal fractionation and can be subdivided into high Ba/Th and high La/Sm groups, which likely originate from fluid‐ and sediment melt‐modified mantle wedge, respectively. In contrast, the HMS have variably mixed compositions (e.g., high Mg#, Ba/Th, and La/Sm) and can be explained by partial melting of mélange diapirs rising into the mantle wedge, which are mixtures of subducted sediment, eroded arc crust or CC, buoyant oceanic crust, and peridotite. We, therefore, propose a two‐step process for creating CC involving extraction of LMS from the mantle followed by re‐melting of recycled LMS in the mantle to generate HMS and thus CC.https://doi.org/10.1029/2021GL097515low‐Mg serieshigh‐Mg seriesmetasomatized mantleMélange diapirscontinental crustal formation |
| spellingShingle | Shi‐Min Li Qing Wang Di‐Cheng Zhu Peter A. Cawood Robert J. Stern Zhidan Zhao Formation of Continental Crust by Diapiric Melting of Recycled Crustal Materials in the Mantle Wedge Geophysical Research Letters low‐Mg series high‐Mg series metasomatized mantle Mélange diapirs continental crustal formation |
| title | Formation of Continental Crust by Diapiric Melting of Recycled Crustal Materials in the Mantle Wedge |
| title_full | Formation of Continental Crust by Diapiric Melting of Recycled Crustal Materials in the Mantle Wedge |
| title_fullStr | Formation of Continental Crust by Diapiric Melting of Recycled Crustal Materials in the Mantle Wedge |
| title_full_unstemmed | Formation of Continental Crust by Diapiric Melting of Recycled Crustal Materials in the Mantle Wedge |
| title_short | Formation of Continental Crust by Diapiric Melting of Recycled Crustal Materials in the Mantle Wedge |
| title_sort | formation of continental crust by diapiric melting of recycled crustal materials in the mantle wedge |
| topic | low‐Mg series high‐Mg series metasomatized mantle Mélange diapirs continental crustal formation |
| url | https://doi.org/10.1029/2021GL097515 |
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