Apatite Geochemical Perspectives on the Maturation of Continental Arc Crust via Mush‐Facilitated Processes During Magmatic Flare‐Up
Abstract In volcanic arcs, magma evolves from basaltic to intermediate and felsic composition, resulting in arc crust maturation. It remains unclear whether processes involving mush during magmatic flare‐ups would enhance this evolution. This study revealed a temporal‐compositional evolution of plut...
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Wiley
2025-01-01
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| Series: | Geochemistry, Geophysics, Geosystems |
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| Online Access: | https://doi.org/10.1029/2024GC011700 |
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| author | Long Chen Peng Gao Ian Somerville San‐Zhong Li Jiang‐Hong Deng Dong‐Yong Li Sheng‐Yao Yu Xiao‐Hui Li Hua‐Hua Cao Zi‐Fu Zhao Zhi‐Feng Yin |
| author_facet | Long Chen Peng Gao Ian Somerville San‐Zhong Li Jiang‐Hong Deng Dong‐Yong Li Sheng‐Yao Yu Xiao‐Hui Li Hua‐Hua Cao Zi‐Fu Zhao Zhi‐Feng Yin |
| author_sort | Long Chen |
| collection | DOAJ |
| description | Abstract In volcanic arcs, magma evolves from basaltic to intermediate and felsic composition, resulting in arc crust maturation. It remains unclear whether processes involving mush during magmatic flare‐ups would enhance this evolution. This study revealed a temporal‐compositional evolution of plutonic rocks from mafic (∼94 Ma) to intermediate (∼92–88 Ma) to felsic (∼88 Ma) during a magmatic flare‐up event in the Gangdese arc, Tibet, with increasing radiogenic Sr–Nd isotope enrichment. Apatites in mafic and felsic rocks have εNd(t) values similar to their hosts, while intermediate rocks show higher values. The elemental composition of apatites in mafic and intermediate rocks is similar but differs from those in felsic rocks. Textural and compositional features indicate varying degrees of influence of mafic rock compositions by accumulation. Triangular and linear covariation relationships between apatite‐compatible (e.g., La) and ‐incompatible (e.g., Rb) elements with SiO2, respectively, for all plutonic rocks as a whole, confirm the incorporation of apatite‐rich mushes into the mixing process. These findings suggest that mafic magma crystallized into apatite‐rich mush, which was later remobilized and mixed with felsic magma to form intermediate magma. Felsic rocks represent end‐member magmas resulting from crustal anatexis and/or mafic magma differentiation. Thus, the Gangdese arc's maturation during the magmatic flare‐up progressed sequentially through mafic magma crystallization and mush formation, mush remobilization and mixing with felsic magma, and the eventual accumulation and segregation of felsic magma. This sequence of events during flare‐ups illustrates a common crustal maturation process in volcanic arcs, as also seen in the Andean Cordillera. |
| format | Article |
| id | doaj-art-e328a02882944e90b6146014164c44d4 |
| institution | OA Journals |
| issn | 1525-2027 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Wiley |
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| series | Geochemistry, Geophysics, Geosystems |
| spelling | doaj-art-e328a02882944e90b6146014164c44d42025-08-20T02:10:49ZengWileyGeochemistry, Geophysics, Geosystems1525-20272025-01-01261n/an/a10.1029/2024GC011700Apatite Geochemical Perspectives on the Maturation of Continental Arc Crust via Mush‐Facilitated Processes During Magmatic Flare‐UpLong Chen0Peng Gao1Ian Somerville2San‐Zhong Li3Jiang‐Hong Deng4Dong‐Yong Li5Sheng‐Yao Yu6Xiao‐Hui Li7Hua‐Hua Cao8Zi‐Fu Zhao9Zhi‐Feng Yin10Frontiers Science Center for Deep Ocean Multispheres and Earth System Key Lab of Submarine GeoSciences and Prospecting Techniques MOE and College of Marine GeoSciences Ocean University of China Qingdao ChinaState Key Laboratory of Lithospheric and Environmental Coevolution University of Science and Technology of China Hefei ChinaUCD School of Earth Sciences University College Dublin Belfield IrelandFrontiers Science Center for Deep Ocean Multispheres and Earth System Key Lab of Submarine GeoSciences and Prospecting Techniques MOE and College of Marine GeoSciences Ocean University of China Qingdao ChinaCenter of Deep Sea Research Institute of Oceanology Center for Ocean Mega–Science Chinese Academy of Sciences Qingdao ChinaFrontiers Science Center for Deep Ocean Multispheres and Earth System Key Lab of Submarine GeoSciences and Prospecting Techniques MOE and College of Marine GeoSciences Ocean University of China Qingdao ChinaFrontiers Science Center for Deep Ocean Multispheres and Earth System Key Lab of Submarine GeoSciences and Prospecting Techniques MOE and College of Marine GeoSciences Ocean University of China Qingdao ChinaFrontiers Science Center for Deep Ocean Multispheres and Earth System Key Lab of Submarine GeoSciences and Prospecting Techniques MOE and College of Marine GeoSciences Ocean University of China Qingdao ChinaFrontiers Science Center for Deep Ocean Multispheres and Earth System Key Lab of Submarine GeoSciences and Prospecting Techniques MOE and College of Marine GeoSciences Ocean University of China Qingdao ChinaState Key Laboratory of Lithospheric and Environmental Coevolution University of Science and Technology of China Hefei ChinaSchool of Materials Science and Engineering Yancheng Institute of Technology Yancheng ChinaAbstract In volcanic arcs, magma evolves from basaltic to intermediate and felsic composition, resulting in arc crust maturation. It remains unclear whether processes involving mush during magmatic flare‐ups would enhance this evolution. This study revealed a temporal‐compositional evolution of plutonic rocks from mafic (∼94 Ma) to intermediate (∼92–88 Ma) to felsic (∼88 Ma) during a magmatic flare‐up event in the Gangdese arc, Tibet, with increasing radiogenic Sr–Nd isotope enrichment. Apatites in mafic and felsic rocks have εNd(t) values similar to their hosts, while intermediate rocks show higher values. The elemental composition of apatites in mafic and intermediate rocks is similar but differs from those in felsic rocks. Textural and compositional features indicate varying degrees of influence of mafic rock compositions by accumulation. Triangular and linear covariation relationships between apatite‐compatible (e.g., La) and ‐incompatible (e.g., Rb) elements with SiO2, respectively, for all plutonic rocks as a whole, confirm the incorporation of apatite‐rich mushes into the mixing process. These findings suggest that mafic magma crystallized into apatite‐rich mush, which was later remobilized and mixed with felsic magma to form intermediate magma. Felsic rocks represent end‐member magmas resulting from crustal anatexis and/or mafic magma differentiation. Thus, the Gangdese arc's maturation during the magmatic flare‐up progressed sequentially through mafic magma crystallization and mush formation, mush remobilization and mixing with felsic magma, and the eventual accumulation and segregation of felsic magma. This sequence of events during flare‐ups illustrates a common crustal maturation process in volcanic arcs, as also seen in the Andean Cordillera.https://doi.org/10.1029/2024GC011700apatite geochemistryarc crust maturationmush remobilizationmagmatic flare‐upGangdese arcTibet |
| spellingShingle | Long Chen Peng Gao Ian Somerville San‐Zhong Li Jiang‐Hong Deng Dong‐Yong Li Sheng‐Yao Yu Xiao‐Hui Li Hua‐Hua Cao Zi‐Fu Zhao Zhi‐Feng Yin Apatite Geochemical Perspectives on the Maturation of Continental Arc Crust via Mush‐Facilitated Processes During Magmatic Flare‐Up Geochemistry, Geophysics, Geosystems apatite geochemistry arc crust maturation mush remobilization magmatic flare‐up Gangdese arc Tibet |
| title | Apatite Geochemical Perspectives on the Maturation of Continental Arc Crust via Mush‐Facilitated Processes During Magmatic Flare‐Up |
| title_full | Apatite Geochemical Perspectives on the Maturation of Continental Arc Crust via Mush‐Facilitated Processes During Magmatic Flare‐Up |
| title_fullStr | Apatite Geochemical Perspectives on the Maturation of Continental Arc Crust via Mush‐Facilitated Processes During Magmatic Flare‐Up |
| title_full_unstemmed | Apatite Geochemical Perspectives on the Maturation of Continental Arc Crust via Mush‐Facilitated Processes During Magmatic Flare‐Up |
| title_short | Apatite Geochemical Perspectives on the Maturation of Continental Arc Crust via Mush‐Facilitated Processes During Magmatic Flare‐Up |
| title_sort | apatite geochemical perspectives on the maturation of continental arc crust via mush facilitated processes during magmatic flare up |
| topic | apatite geochemistry arc crust maturation mush remobilization magmatic flare‐up Gangdese arc Tibet |
| url | https://doi.org/10.1029/2024GC011700 |
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