Lithosphere-asthenosphere interaction beneath Ireland from joint inversion of 
teleseismic P-wave delay times and GRACE gravity

O'Donnell, J. P.; Daly, E.; Tiberi, C.; Bastow, I. D.; O'Reilly, B. M.; Readman, P. W.; Hauser, F.

doi:10.1111/j.1365-246X.2011.04921.x

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Lithosphere-asthenosphere interaction beneath Ireland from joint inversion of teleseismic P-wave delay times and GRACE gravity

O'Donnell, J. P., Daly, E., Tiberi, C., Bastow, I. D., O'Reilly, B. M., Readman, P. W., Hauser, F. (2011): Lithosphere-asthenosphere interaction beneath Ireland from joint inversion of teleseismic P-wave delay times and GRACE gravity. - Geophysical Journal International, 184, 3, 1379-1396.
https://doi.org/10.1111/j.1365-246X.2011.04921.x

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_1080891 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_1080891_2

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Creators:
O'Donnell, J. P.^{1, 2, 3}, Author
Daly, E.^{1, 2, 3}, Author
Tiberi, C.^{1, 2, 3}, Author
Bastow, I. D.^{1, 2, 3}, Author
O'Reilly, B. M.^{1, 2, 3}, Author
Readman, P. W.^{1, 2, 3}, Author
Hauser, F.^{1, 2, 3}, Author

Affiliations:
1External Organizations, ou_persistent22
2Publikationen aller GRACE-unterstützten Projekte, Deutsches GeoForschungsZentrum, ou_938888
3GEOFON, Deutsches GeoForschungsZentrum, Potsdam, , ou_2634888

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Free keywords: Gravity anomalies and Earth structure, Body waves, Seismic tomography, Dynamics of lithosphere and mantle, Europe

Abstract: 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.

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Language(s): eng - English

Dates: Finally published : 2011

Publication Status: Finally published

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Identifiers: DOI: 10.1111/j.1365-246X.2011.04921.x
URI: http://doi.crossref.org/servlet/query?format=unixref&pid=bib@gfz-potsdam.de&id=10.1111/j.1365-246X.2011.04921.x

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Title: Geophysical Journal International

Source Genre: Journal, SCI, Scopus, ab 2024 OA-Gold

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Pages: - Volume / Issue: 184 (3) Sequence Number: - Start / End Page: 1379 - 1396 Identifier: CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/journals180