Modeling the impact of melt on seismic properties during mountain building
Initiation of partial melting in the mid/lower crust causes a decrease in P-wave and S-wave velocities; recent studies imply that the relationship between these velocities and melt is not simple. We have developed a modelling approach to assess the combined impact of various melt and solid phase pro...
Published in: | Geochemistry, Geophysics, Geosystems |
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American Geophysical Union (AGU)
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ftleedsuniv:oai:eprints.whiterose.ac.uk:112722 2023-05-15T17:43:34+02:00 Modeling the impact of melt on seismic properties during mountain building Lee, AL Walker, AM Lloyd, GE Torvela, T 2017-03 text https://eprints.whiterose.ac.uk/112722/ https://eprints.whiterose.ac.uk/112722/7/Lee_et_al-2017-Geochemistry,_Geophysics,_Geosystems.pdf https://doi.org/10.1002/2016GC006705 en eng American Geophysical Union (AGU) https://eprints.whiterose.ac.uk/112722/7/Lee_et_al-2017-Geochemistry,_Geophysics,_Geosystems.pdf Lee, AL orcid.org/0000-0003-0067-9183 , Walker, AM orcid.org/0000-0003-3121-3255 , Lloyd, GE orcid.org/0000-0002-7859-2486 et al. (1 more author) (2017) Modeling the impact of melt on seismic properties during mountain building. Geochemistry, Geophysics, Geosystems, 18 (3). pp. 1090-1110. ISSN 1525-2027 Article NonPeerReviewed 2017 ftleedsuniv https://doi.org/10.1002/2016GC006705 2023-01-30T21:52:02Z Initiation of partial melting in the mid/lower crust causes a decrease in P-wave and S-wave velocities; recent studies imply that the relationship between these velocities and melt is not simple. We have developed a modelling approach to assess the combined impact of various melt and solid phase properties on seismic velocities and anisotropy. The modelling is based on crystallographic preferred orientation (CPO) data measured from migmatite samples, allowing quantification of the variation of seismic velocities with varying melt volumes, shapes, orientations, and matrix anisotropy. The results show non-linear behaviour of seismic properties as a result of the interaction of all of these physical properties, which in turn depend on lithology, stress regime, strain rate, pre-existing rock fabrics, and pressure-temperature conditions. This non-linear behaviour is evident when applied to a suite of samples from a traverse across a migmatitic shear zone in the Seiland Igneous Province, Northern Norway. Critically, changes in solid phase composition and CPO, and melt shape and orientation with respect to the wave propagation direction can result in huge variations in the same seismic property even if the melt fraction remains the same. A comparison with surface wave interpretations from tectonically active regions highlights the issues in current models used to predict melt percentages or partially molten regions. Interpretation of seismic data to infer melt percentages or extent of melting should, therefore, always be underpinned by robust modelling of the underlying geological parameters combined with examination of multiple seismic properties in order to reduce uncertainty of the interpretation. Article in Journal/Newspaper Northern Norway White Rose Research Online (Universities of Leeds, Sheffield & York) Norway Seiland ENVELOPE(23.275,23.275,70.430,70.430) Geochemistry, Geophysics, Geosystems 18 3 1090 1110 |
institution |
Open Polar |
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White Rose Research Online (Universities of Leeds, Sheffield & York) |
op_collection_id |
ftleedsuniv |
language |
English |
description |
Initiation of partial melting in the mid/lower crust causes a decrease in P-wave and S-wave velocities; recent studies imply that the relationship between these velocities and melt is not simple. We have developed a modelling approach to assess the combined impact of various melt and solid phase properties on seismic velocities and anisotropy. The modelling is based on crystallographic preferred orientation (CPO) data measured from migmatite samples, allowing quantification of the variation of seismic velocities with varying melt volumes, shapes, orientations, and matrix anisotropy. The results show non-linear behaviour of seismic properties as a result of the interaction of all of these physical properties, which in turn depend on lithology, stress regime, strain rate, pre-existing rock fabrics, and pressure-temperature conditions. This non-linear behaviour is evident when applied to a suite of samples from a traverse across a migmatitic shear zone in the Seiland Igneous Province, Northern Norway. Critically, changes in solid phase composition and CPO, and melt shape and orientation with respect to the wave propagation direction can result in huge variations in the same seismic property even if the melt fraction remains the same. A comparison with surface wave interpretations from tectonically active regions highlights the issues in current models used to predict melt percentages or partially molten regions. Interpretation of seismic data to infer melt percentages or extent of melting should, therefore, always be underpinned by robust modelling of the underlying geological parameters combined with examination of multiple seismic properties in order to reduce uncertainty of the interpretation. |
format |
Article in Journal/Newspaper |
author |
Lee, AL Walker, AM Lloyd, GE Torvela, T |
spellingShingle |
Lee, AL Walker, AM Lloyd, GE Torvela, T Modeling the impact of melt on seismic properties during mountain building |
author_facet |
Lee, AL Walker, AM Lloyd, GE Torvela, T |
author_sort |
Lee, AL |
title |
Modeling the impact of melt on seismic properties during mountain building |
title_short |
Modeling the impact of melt on seismic properties during mountain building |
title_full |
Modeling the impact of melt on seismic properties during mountain building |
title_fullStr |
Modeling the impact of melt on seismic properties during mountain building |
title_full_unstemmed |
Modeling the impact of melt on seismic properties during mountain building |
title_sort |
modeling the impact of melt on seismic properties during mountain building |
publisher |
American Geophysical Union (AGU) |
publishDate |
2017 |
url |
https://eprints.whiterose.ac.uk/112722/ https://eprints.whiterose.ac.uk/112722/7/Lee_et_al-2017-Geochemistry,_Geophysics,_Geosystems.pdf https://doi.org/10.1002/2016GC006705 |
long_lat |
ENVELOPE(23.275,23.275,70.430,70.430) |
geographic |
Norway Seiland |
geographic_facet |
Norway Seiland |
genre |
Northern Norway |
genre_facet |
Northern Norway |
op_relation |
https://eprints.whiterose.ac.uk/112722/7/Lee_et_al-2017-Geochemistry,_Geophysics,_Geosystems.pdf Lee, AL orcid.org/0000-0003-0067-9183 , Walker, AM orcid.org/0000-0003-3121-3255 , Lloyd, GE orcid.org/0000-0002-7859-2486 et al. (1 more author) (2017) Modeling the impact of melt on seismic properties during mountain building. Geochemistry, Geophysics, Geosystems, 18 (3). pp. 1090-1110. ISSN 1525-2027 |
op_doi |
https://doi.org/10.1002/2016GC006705 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
18 |
container_issue |
3 |
container_start_page |
1090 |
op_container_end_page |
1110 |
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1766145678891810816 |