Physical conditions for basaltic volcanism beneath the Jeju volcanic field and the geodynamic implications.
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| Title: | Physical conditions for basaltic volcanism beneath the Jeju volcanic field and the geodynamic implications. |
|---|---|
| Authors: | Lee, Seung Ryeol1 (AUTHOR) leesr@kigam.re.kr |
| Source: | Geosciences Journal. Oct2024, Vol. 28 Issue 5, p789-798. 10p. |
| Subject Terms: | *Intraplate volcanism, *Volcanic fields, *Subduction zones, *Plate tectonics, *Slabs (Structural geology) |
| Abstract: | The origin of the late Cenozoic intraplate volcanoes in the NE Asia has sparked debate, with explanations ranging from deep mantle plume to lithospheric extension and decompression melting of mantle upwelling by distal subduction tectonics. The Jeju volcanic field (JVF), being the closest late Cenozoic intraplate volcano to the subduction zone, sheds light on whether the intraplate volcanism is primarily plume-related or linked to plate tectonics. This study determined the primary magma composition for JVF basalts, using the most primitive bulk-rock samples (MgO > 8.5 wt%), by incrementally adding olivine to melt until reaching equilibrium with olivine (Mg# = 90) in the residual mantle. The estimated temperature and pressure of mantle melting are 1,466–1,587 °C and 2.1–4.1 GPa for anhydrous primary magma and 1,347–1,512 °C and 2.0–3.6 GPa for hydrous primary magma within the acceptable range of water contents (H2O = 2–4 wt%) reported from the Chinese intraplate basalts. The pressure estimates suggest that the minimal depth of the lithosphere-asthenosphere boundary is approximately ∼50–55 km. The mantle potential temperature for anhydrous primary magma is estimated to be 1,460–1,580 °C, higher than 1,300–1,400 °C of the ambient upper mantle, indicating a hot thermal regime below the JVF. Despite the absence of geophysical evidence for a mantle plume beneath the JVF, this study proposes that the hot mantle wedge is likely caused by the lateral influx or edge-driven convective upwelling of thermal plume near the leading edge of the stagnant Pacific Plate slab, contributing to the big mantle wedge. Intraplate volcanism in the JVF is proposed to be driven by lithospheric extension and decompression melting of the convective upwelling of hot sub-lithospheric mantle, influenced by distal subduction tectonics in the hot subduction zone. This model is supported by the present-day tectonics observed in the hot Ryukyu subduction zone, SW Japan. [ABSTRACT FROM AUTHOR] |
| Database: | Energy & Power Source |
| FullText | Links: – Type: pdflink Text: Availability: 0 |
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| Header | DbId: enr DbLabel: Energy & Power Source An: 179573781 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Physical conditions for basaltic volcanism beneath the Jeju volcanic field and the geodynamic implications. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Lee%2C+Seung+Ryeol%22">Lee, Seung Ryeol</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> leesr@kigam.re.kr</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Geosciences+Journal%22">Geosciences Journal</searchLink>. Oct2024, Vol. 28 Issue 5, p789-798. 10p. – Name: Subject Label: Subject Terms Group: Su Data: *<searchLink fieldCode="DE" term="%22Intraplate+volcanism%22">Intraplate volcanism</searchLink><br />*<searchLink fieldCode="DE" term="%22Volcanic+fields%22">Volcanic fields</searchLink><br />*<searchLink fieldCode="DE" term="%22Subduction+zones%22">Subduction zones</searchLink><br />*<searchLink fieldCode="DE" term="%22Plate+tectonics%22">Plate tectonics</searchLink><br />*<searchLink fieldCode="DE" term="%22Slabs+%28Structural+geology%29%22">Slabs (Structural geology)</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The origin of the late Cenozoic intraplate volcanoes in the NE Asia has sparked debate, with explanations ranging from deep mantle plume to lithospheric extension and decompression melting of mantle upwelling by distal subduction tectonics. The Jeju volcanic field (JVF), being the closest late Cenozoic intraplate volcano to the subduction zone, sheds light on whether the intraplate volcanism is primarily plume-related or linked to plate tectonics. This study determined the primary magma composition for JVF basalts, using the most primitive bulk-rock samples (MgO > 8.5 wt%), by incrementally adding olivine to melt until reaching equilibrium with olivine (Mg# = 90) in the residual mantle. The estimated temperature and pressure of mantle melting are 1,466–1,587 °C and 2.1–4.1 GPa for anhydrous primary magma and 1,347–1,512 °C and 2.0–3.6 GPa for hydrous primary magma within the acceptable range of water contents (H2O = 2–4 wt%) reported from the Chinese intraplate basalts. The pressure estimates suggest that the minimal depth of the lithosphere-asthenosphere boundary is approximately ∼50–55 km. The mantle potential temperature for anhydrous primary magma is estimated to be 1,460–1,580 °C, higher than 1,300–1,400 °C of the ambient upper mantle, indicating a hot thermal regime below the JVF. Despite the absence of geophysical evidence for a mantle plume beneath the JVF, this study proposes that the hot mantle wedge is likely caused by the lateral influx or edge-driven convective upwelling of thermal plume near the leading edge of the stagnant Pacific Plate slab, contributing to the big mantle wedge. Intraplate volcanism in the JVF is proposed to be driven by lithospheric extension and decompression melting of the convective upwelling of hot sub-lithospheric mantle, influenced by distal subduction tectonics in the hot subduction zone. This model is supported by the present-day tectonics observed in the hot Ryukyu subduction zone, SW Japan. [ABSTRACT FROM AUTHOR] |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1007/s12303-024-0031-3 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 10 StartPage: 789 Subjects: – SubjectFull: Intraplate volcanism Type: general – SubjectFull: Volcanic fields Type: general – SubjectFull: Subduction zones Type: general – SubjectFull: Plate tectonics Type: general – SubjectFull: Slabs (Structural geology) Type: general Titles: – TitleFull: Physical conditions for basaltic volcanism beneath the Jeju volcanic field and the geodynamic implications. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Lee, Seung Ryeol IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 10 Text: Oct2024 Type: published Y: 2024 Identifiers: – Type: issn-print Value: 12264806 Numbering: – Type: volume Value: 28 – Type: issue Value: 5 Titles: – TitleFull: Geosciences Journal Type: main |
| ResultId | 1 |
