Secular mantle wedge evolution due to variable slab fluid metasomatism: Evidence from Permian-Triassic mafic igneous rocks in the Paleo-Tethys tectonic regime.
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| Title: | Secular mantle wedge evolution due to variable slab fluid metasomatism: Evidence from Permian-Triassic mafic igneous rocks in the Paleo-Tethys tectonic regime. |
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| Authors: | Hu, Ye-Dan1 (AUTHOR), Dai, Li-Qun1,2 (AUTHOR) lqdai@ustc.edu.cn, Ma, Li-Tao1 (AUTHOR), Zhao, Zi-Fu1,2 (AUTHOR) |
| Source: | Chemical Geology. Sep2024, Vol. 663, pN.PAG-N.PAG. 1p. |
| Subjects: | Mafic rocks, Igneous rocks, Slabs (Structural geology), Tethys (Paleogeography), Orogenic belts |
| Abstract: | Orogenic mafic magmatism provides us an excellent opportunity to study the temporal and compositional evolution of the mantle wedge above the subducting oceanic slabs. Here, we synthesize geochemical data for Permian-Triassic mafic igneous rocks from the East Kunlun Orogenic Belt (EKOB) in Western China, which provides new insights into the secular evolution of the mantle wedge during the Paleo-Tethys oceanic subduction in the Paleo-Tethys tectonic regime. We find that the Permian-Triassic mafic igneous rocks exhibit systematic changes in their geochemical compositions with temporal evolution. The decreasing Ba/Th (7.6–572), Pb/Ce (0.07–1.9) and Sr/Nd (2.8–130) ratios and increasing La/Sm (1.3–9.8) and Th/Yb (0.1–6.1) ratios of these Permian-Triassic mafic igneous rocks correspond with the temporal evolution. More importantly, the radiogenic Nd Hf isotopes (ε Nd (t) = −7.9–4.2, ε Hf (t) = −12.3–18.9) show a progressively enriched trend with time. These data indicate that their mantle sources were continuously metasomatized by the subducting slab-derived fluids, whose compositions are generally transitional from igneous crust-derived aqueous solutions to sediment-derived hydrous melts. Meanwhile, the mantle source composition is generally transitional from hydrous peridotite to pyroxenite. Therefore, these Permian-Triassic mafic igneous rocks not only record the long-term evolution of mantle wedge properties, but also infer the continuous slab fluid evolution and associated crust-mantle interaction during the Paleo-Tethys oceanic subduction. [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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| Header | DbId: egs DbLabel: Engineering Source An: 179033686 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Secular mantle wedge evolution due to variable slab fluid metasomatism: Evidence from Permian-Triassic mafic igneous rocks in the Paleo-Tethys tectonic regime. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Hu%2C+Ye-Dan%22">Hu, Ye-Dan</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Dai%2C+Li-Qun%22">Dai, Li-Qun</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> lqdai@ustc.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Ma%2C+Li-Tao%22">Ma, Li-Tao</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhao%2C+Zi-Fu%22">Zhao, Zi-Fu</searchLink><relatesTo>1,2</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Chemical+Geology%22">Chemical Geology</searchLink>. Sep2024, Vol. 663, pN.PAG-N.PAG. 1p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Mafic+rocks%22">Mafic rocks</searchLink><br /><searchLink fieldCode="DE" term="%22Igneous+rocks%22">Igneous rocks</searchLink><br /><searchLink fieldCode="DE" term="%22Slabs+%28Structural+geology%29%22">Slabs (Structural geology)</searchLink><br /><searchLink fieldCode="DE" term="%22Tethys+%28Paleogeography%29%22">Tethys (Paleogeography)</searchLink><br /><searchLink fieldCode="DE" term="%22Orogenic+belts%22">Orogenic belts</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Orogenic mafic magmatism provides us an excellent opportunity to study the temporal and compositional evolution of the mantle wedge above the subducting oceanic slabs. Here, we synthesize geochemical data for Permian-Triassic mafic igneous rocks from the East Kunlun Orogenic Belt (EKOB) in Western China, which provides new insights into the secular evolution of the mantle wedge during the Paleo-Tethys oceanic subduction in the Paleo-Tethys tectonic regime. We find that the Permian-Triassic mafic igneous rocks exhibit systematic changes in their geochemical compositions with temporal evolution. The decreasing Ba/Th (7.6–572), Pb/Ce (0.07–1.9) and Sr/Nd (2.8–130) ratios and increasing La/Sm (1.3–9.8) and Th/Yb (0.1–6.1) ratios of these Permian-Triassic mafic igneous rocks correspond with the temporal evolution. More importantly, the radiogenic Nd Hf isotopes (ε Nd (t) = −7.9–4.2, ε Hf (t) = −12.3–18.9) show a progressively enriched trend with time. These data indicate that their mantle sources were continuously metasomatized by the subducting slab-derived fluids, whose compositions are generally transitional from igneous crust-derived aqueous solutions to sediment-derived hydrous melts. Meanwhile, the mantle source composition is generally transitional from hydrous peridotite to pyroxenite. Therefore, these Permian-Triassic mafic igneous rocks not only record the long-term evolution of mantle wedge properties, but also infer the continuous slab fluid evolution and associated crust-mantle interaction during the Paleo-Tethys oceanic subduction. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>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.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.chemgeo.2024.122285 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 1 StartPage: N.PAG Subjects: – SubjectFull: Mafic rocks Type: general – SubjectFull: Igneous rocks Type: general – SubjectFull: Slabs (Structural geology) Type: general – SubjectFull: Tethys (Paleogeography) Type: general – SubjectFull: Orogenic belts Type: general Titles: – TitleFull: Secular mantle wedge evolution due to variable slab fluid metasomatism: Evidence from Permian-Triassic mafic igneous rocks in the Paleo-Tethys tectonic regime. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Hu, Ye-Dan – PersonEntity: Name: NameFull: Dai, Li-Qun – PersonEntity: Name: NameFull: Ma, Li-Tao – PersonEntity: Name: NameFull: Zhao, Zi-Fu IsPartOfRelationships: – BibEntity: Dates: – D: 20 M: 09 Text: Sep2024 Type: published Y: 2024 Identifiers: – Type: issn-print Value: 00092541 Numbering: – Type: volume Value: 663 Titles: – TitleFull: Chemical Geology Type: main |
| ResultId | 1 |
