Lithosphere-asthenosphere interaction beneath Ireland from joint inversion of teleseismic P-wave delay times and GRACE gravity
International audience The nature and extent of the regional lithosphere-asthenosphere interaction beneath Ireland and Britain remains unclear. Although it has been established that ancient Caledonian signatures pervade the lithosphere, tertiary structure related to the Iceland plume has been inferr...
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Online Access: | https://hal.science/hal-00617815 https://hal.science/hal-00617815/document https://hal.science/hal-00617815/file/184-3-1379.pdf https://doi.org/10.1111/j.1365-246X.2011.04921.x |
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ftinsu:oai:HAL:hal-00617815v1 2023-06-18T03:41:21+02:00 Lithosphere-asthenosphere interaction beneath Ireland from joint inversion of teleseismic P-wave delay times and GRACE gravity O'Donnell, J. P. Daly, E. Tiberi, Christel Bastow, I. D. O'Reilly, B. M. Readman, P. W. Hauser, F. Department of Earth and Ocean Sciences Galway National University of Ireland Galway (NUI Galway) Géosciences Montpellier Université des Antilles et de la Guyane (UAG)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS) School of Earth Sciences Bristol University of Bristol Bristol Dublin Institute for Advanced Studies (DIAS) School of Geological Sciences Dublin University College Dublin Dublin (UCD) 2011-03 https://hal.science/hal-00617815 https://hal.science/hal-00617815/document https://hal.science/hal-00617815/file/184-3-1379.pdf https://doi.org/10.1111/j.1365-246X.2011.04921.x en eng HAL CCSD Oxford University Press (OUP) info:eu-repo/semantics/altIdentifier/doi/10.1111/j.1365-246X.2011.04921.x hal-00617815 https://hal.science/hal-00617815 https://hal.science/hal-00617815/document https://hal.science/hal-00617815/file/184-3-1379.pdf doi:10.1111/j.1365-246X.2011.04921.x http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 0956-540X EISSN: 1365-246X Geophysical Journal International https://hal.science/hal-00617815 Geophysical Journal International, 2011, 184 (3), pp.1379-1396. ⟨10.1111/j.1365-246X.2011.04921.x⟩ Gravity anomalies Earth structure Body waves Seismic tomography Dynamics of lithosphere [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] [SDE.MCG]Environmental Sciences/Global Changes info:eu-repo/semantics/article Journal articles 2011 ftinsu https://doi.org/10.1111/j.1365-246X.2011.04921.x 2023-06-05T21:34:44Z International audience The nature and extent of the regional lithosphere-asthenosphere interaction beneath Ireland and Britain remains unclear. Although it has been established that ancient Caledonian signatures pervade the lithosphere, tertiary structure related to the Iceland plume has been inferred to dominate the asthenosphere. To address this apparent contradiction in the literature, we image the 3-D lithospheric and deeper upper-mantle structure beneath Ireland via non-linear, iterative joint teleseismic-gravity inversion using data from the ISLE (Irish Seismic Lithospheric Experiment), ISUME (Irish Seismic Upper Mantle Experiment) and GRACE (Gravity Recovery and Climate Experiment) experiments. The inversion combines teleseismic relative arrival time residuals with the GRACE long wavelength satellite derived gravity anomaly by assuming a depth-dependent quasilinear velocity-density relationship. We argue that anomalies imaged at lithospheric depths probably reflect compositional contrasts, either due to terrane accretion associated with Iapetus Ocean closure, frozen decompressional melt that was generated by plate stretching during the opening of the north Atlantic Ocean, frozen Iceland plume related magmatic intrusions, or a combination thereof. The continuation of the anomalous structure across the lithosphere-asthenosphere boundary is interpreted as possibly reflecting sub-lithospheric small-scale convection initiated by the lithospheric compositional contrasts. Our hypothesis thus reconciles the disparity which exists between lithospheric and asthenospheric structure beneath this region of the north Atlantic rifted margin. Article in Journal/Newspaper Iceland North Atlantic Institut national des sciences de l'Univers: HAL-INSU Geophysical Journal International 184 3 1379 1396 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
Gravity anomalies Earth structure Body waves Seismic tomography Dynamics of lithosphere [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] [SDE.MCG]Environmental Sciences/Global Changes |
spellingShingle |
Gravity anomalies Earth structure Body waves Seismic tomography Dynamics of lithosphere [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] [SDE.MCG]Environmental Sciences/Global Changes O'Donnell, J. P. Daly, E. Tiberi, Christel Bastow, I. D. O'Reilly, B. M. Readman, P. W. Hauser, F. Lithosphere-asthenosphere interaction beneath Ireland from joint inversion of teleseismic P-wave delay times and GRACE gravity |
topic_facet |
Gravity anomalies Earth structure Body waves Seismic tomography Dynamics of lithosphere [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] [SDE.MCG]Environmental Sciences/Global Changes |
description |
International audience The nature and extent of the regional lithosphere-asthenosphere interaction beneath Ireland and Britain remains unclear. Although it has been established that ancient Caledonian signatures pervade the lithosphere, tertiary structure related to the Iceland plume has been inferred to dominate the asthenosphere. To address this apparent contradiction in the literature, we image the 3-D lithospheric and deeper upper-mantle structure beneath Ireland via non-linear, iterative joint teleseismic-gravity inversion using data from the ISLE (Irish Seismic Lithospheric Experiment), ISUME (Irish Seismic Upper Mantle Experiment) and GRACE (Gravity Recovery and Climate Experiment) experiments. The inversion combines teleseismic relative arrival time residuals with the GRACE long wavelength satellite derived gravity anomaly by assuming a depth-dependent quasilinear velocity-density relationship. We argue that anomalies imaged at lithospheric depths probably reflect compositional contrasts, either due to terrane accretion associated with Iapetus Ocean closure, frozen decompressional melt that was generated by plate stretching during the opening of the north Atlantic Ocean, frozen Iceland plume related magmatic intrusions, or a combination thereof. The continuation of the anomalous structure across the lithosphere-asthenosphere boundary is interpreted as possibly reflecting sub-lithospheric small-scale convection initiated by the lithospheric compositional contrasts. Our hypothesis thus reconciles the disparity which exists between lithospheric and asthenospheric structure beneath this region of the north Atlantic rifted margin. |
author2 |
Department of Earth and Ocean Sciences Galway National University of Ireland Galway (NUI Galway) Géosciences Montpellier Université des Antilles et de la Guyane (UAG)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS) School of Earth Sciences Bristol University of Bristol Bristol Dublin Institute for Advanced Studies (DIAS) School of Geological Sciences Dublin University College Dublin Dublin (UCD) |
format |
Article in Journal/Newspaper |
author |
O'Donnell, J. P. Daly, E. Tiberi, Christel Bastow, I. D. O'Reilly, B. M. Readman, P. W. Hauser, F. |
author_facet |
O'Donnell, J. P. Daly, E. Tiberi, Christel Bastow, I. D. O'Reilly, B. M. Readman, P. W. Hauser, F. |
author_sort |
O'Donnell, J. P. |
title |
Lithosphere-asthenosphere interaction beneath Ireland from joint inversion of teleseismic P-wave delay times and GRACE gravity |
title_short |
Lithosphere-asthenosphere interaction beneath Ireland from joint inversion of teleseismic P-wave delay times and GRACE gravity |
title_full |
Lithosphere-asthenosphere interaction beneath Ireland from joint inversion of teleseismic P-wave delay times and GRACE gravity |
title_fullStr |
Lithosphere-asthenosphere interaction beneath Ireland from joint inversion of teleseismic P-wave delay times and GRACE gravity |
title_full_unstemmed |
Lithosphere-asthenosphere interaction beneath Ireland from joint inversion of teleseismic P-wave delay times and GRACE gravity |
title_sort |
lithosphere-asthenosphere interaction beneath ireland from joint inversion of teleseismic p-wave delay times and grace gravity |
publisher |
HAL CCSD |
publishDate |
2011 |
url |
https://hal.science/hal-00617815 https://hal.science/hal-00617815/document https://hal.science/hal-00617815/file/184-3-1379.pdf https://doi.org/10.1111/j.1365-246X.2011.04921.x |
genre |
Iceland North Atlantic |
genre_facet |
Iceland North Atlantic |
op_source |
ISSN: 0956-540X EISSN: 1365-246X Geophysical Journal International https://hal.science/hal-00617815 Geophysical Journal International, 2011, 184 (3), pp.1379-1396. ⟨10.1111/j.1365-246X.2011.04921.x⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1111/j.1365-246X.2011.04921.x hal-00617815 https://hal.science/hal-00617815 https://hal.science/hal-00617815/document https://hal.science/hal-00617815/file/184-3-1379.pdf doi:10.1111/j.1365-246X.2011.04921.x |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1111/j.1365-246X.2011.04921.x |
container_title |
Geophysical Journal International |
container_volume |
184 |
container_issue |
3 |
container_start_page |
1379 |
op_container_end_page |
1396 |
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1769006880842055680 |