Lower lithospheric structure beneath the Trans-European Suture Zone from POLONAISE'97 seismic profiles
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| Title: | Lower lithospheric structure beneath the Trans-European Suture Zone from POLONAISE'97 seismic profiles |
|---|---|
| Authors: | Grad, M.1 mgrad@mimuw.edu.pl, Keller, G.R.2, Thybo, H.3, Guterch, A.4 |
| Source: | Tectonophysics. Dec2002, Vol. 360 Issue 1-4, p153. 16p. |
| Subjects: | Suture zones (Structural geology), Seismology |
| Geographic Terms: | Europe |
| Abstract: | The large-scale POLONAISE''97 seismic experiment investigated the velocity structure of the lithosphere in the Trans-European Suture Zone (TESZ) region between the Precambrian East European Craton (EEC) and Palaeozoic Platform (PP). In the area of the Polish Basin, the P-wave velocity is very low (Vp <6.1 km/s) down to depths of 15–20 km, and the consolidated basement (Vp∼5.7–5.8 km/s) is 5–12 km deep. The thickness of the crust is ∼30 km beneath the Palaeozoic Platform, 40–45 km beneath the TESZ, and 40–50 km beneath the EEC. The compressional wave velocity of the sub-Moho mantle is >8.25 km/s in the Palaeozoic Platform and ∼8.1 km/s in the Precambrian Platform. Good quality record sections were obtained to the longest offsets of about 600 km from the shot points, with clear first arrivals and later phases of waves reflected/refracted in the lower lithosphere. Two-dimensional interpretation of the reversed system of travel times constrains a series of reflectors in the depth range of 50–90 km. A seismic reflector appears as a general feature at around 10 km depth below Moho in the area, independent of the actual depth to the Moho and sub-Moho seismic velocity. “Ringing reflections” are explained by relatively small-scale heterogeneities beneath the depth interval from ∼90 to 110 km. Qualitative interpretation of the observed wave field shows a differentiation of the reflectivity in the lower lithosphere. The seismic reflectivity of the uppermost mantle is stronger beneath the Palaeozoic Platform and TESZ than the East European Platform. The deepest interpreted seismic reflector with zone of high reflectivity may mark a change in upper mantle structure from an upper zone characterised by seismic scatterers of small vertical dimension to a lower zone with vertically larger seismic scatterers, possible caused by inclusions of partial melt. [Copyright &y& Elsevier] |
| Copyright of Tectonophysics 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.) | |
| Database: | Engineering Source |
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| Items | – Name: Title Label: Title Group: Ti Data: Lower lithospheric structure beneath the Trans-European Suture Zone from POLONAISE'97 seismic profiles – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Grad%2C+M%2E%22">Grad, M.</searchLink><relatesTo>1</relatesTo><i> mgrad@mimuw.edu.pl</i><br /><searchLink fieldCode="AR" term="%22Keller%2C+G%2ER%2E%22">Keller, G.R.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Thybo%2C+H%2E%22">Thybo, H.</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Guterch%2C+A%2E%22">Guterch, A.</searchLink><relatesTo>4</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Tectonophysics%22">Tectonophysics</searchLink>. Dec2002, Vol. 360 Issue 1-4, p153. 16p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Suture+zones+%28Structural+geology%29%22">Suture zones (Structural geology)</searchLink><br /><searchLink fieldCode="DE" term="%22Seismology%22">Seismology</searchLink> – Name: SubjectGeographic Label: Geographic Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Europe%22">Europe</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The large-scale POLONAISE''97 seismic experiment investigated the velocity structure of the lithosphere in the Trans-European Suture Zone (TESZ) region between the Precambrian East European Craton (EEC) and Palaeozoic Platform (PP). In the area of the Polish Basin, the P-wave velocity is very low (Vp <6.1 km/s) down to depths of 15–20 km, and the consolidated basement (Vp∼5.7–5.8 km/s) is 5–12 km deep. The thickness of the crust is ∼30 km beneath the Palaeozoic Platform, 40–45 km beneath the TESZ, and 40–50 km beneath the EEC. The compressional wave velocity of the sub-Moho mantle is >8.25 km/s in the Palaeozoic Platform and ∼8.1 km/s in the Precambrian Platform. Good quality record sections were obtained to the longest offsets of about 600 km from the shot points, with clear first arrivals and later phases of waves reflected/refracted in the lower lithosphere. Two-dimensional interpretation of the reversed system of travel times constrains a series of reflectors in the depth range of 50–90 km. A seismic reflector appears as a general feature at around 10 km depth below Moho in the area, independent of the actual depth to the Moho and sub-Moho seismic velocity. “Ringing reflections” are explained by relatively small-scale heterogeneities beneath the depth interval from ∼90 to 110 km. Qualitative interpretation of the observed wave field shows a differentiation of the reflectivity in the lower lithosphere. The seismic reflectivity of the uppermost mantle is stronger beneath the Palaeozoic Platform and TESZ than the East European Platform. The deepest interpreted seismic reflector with zone of high reflectivity may mark a change in upper mantle structure from an upper zone characterised by seismic scatterers of small vertical dimension to a lower zone with vertically larger seismic scatterers, possible caused by inclusions of partial melt. [Copyright &y& Elsevier] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Tectonophysics 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/S0040-1951(02)00350-5 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 16 StartPage: 153 Subjects: – SubjectFull: Suture zones (Structural geology) Type: general – SubjectFull: Seismology Type: general – SubjectFull: Europe Type: general Titles: – TitleFull: Lower lithospheric structure beneath the Trans-European Suture Zone from POLONAISE'97 seismic profiles Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Grad, M. – PersonEntity: Name: NameFull: Keller, G.R. – PersonEntity: Name: NameFull: Thybo, H. – PersonEntity: Name: NameFull: Guterch, A. IsPartOfRelationships: – BibEntity: Dates: – D: 20 M: 12 Text: Dec2002 Type: published Y: 2002 Identifiers: – Type: issn-print Value: 00401951 Numbering: – Type: volume Value: 360 – Type: issue Value: 1-4 Titles: – TitleFull: Tectonophysics Type: main |
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