An integrated kinematic and geochemical model to determine lithospheric extension and mantle temperature from syn-rift volcanic compositions
We present an integrated kinematic and geochemical model that determines the composition of melts and their residual source rocks generated by decompression melting of the mantle during continental rifting. Our approach is to construct a unified numerical solution that merges an established lithosph...
Published in: | Earth and Planetary Science Letters |
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Language: | English |
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2009
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Online Access: | http://nora.nerc.ac.uk/id/eprint/164930/ https://nora.nerc.ac.uk/id/eprint/164930/1/dean_etal_2009.pdf https://doi.org/10.1016/j.epsl.2008.11.012 |
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ftnerc:oai:nora.nerc.ac.uk:164930 2023-05-15T17:33:06+02:00 An integrated kinematic and geochemical model to determine lithospheric extension and mantle temperature from syn-rift volcanic compositions Dean, S.M. Murton, B.J. Minshull, T.A. Henstock, T.J. White, R.S. 2009-02-15 application/pdf http://nora.nerc.ac.uk/id/eprint/164930/ https://nora.nerc.ac.uk/id/eprint/164930/1/dean_etal_2009.pdf https://doi.org/10.1016/j.epsl.2008.11.012 en eng https://nora.nerc.ac.uk/id/eprint/164930/1/dean_etal_2009.pdf Dean, S.M.; Murton, B.J. orcid:0000-0003-1522-1191 Minshull, T.A.; Henstock, T.J.; White, R.S. 2009 An integrated kinematic and geochemical model to determine lithospheric extension and mantle temperature from syn-rift volcanic compositions. Earth and Planetary Science Letters, 278 (1-2). 26-39. https://doi.org/10.1016/j.epsl.2008.11.012 <https://doi.org/10.1016/j.epsl.2008.11.012> Publication - Article PeerReviewed 2009 ftnerc https://doi.org/10.1016/j.epsl.2008.11.012 2023-02-04T19:35:25Z We present an integrated kinematic and geochemical model that determines the composition of melts and their residual source rocks generated by decompression melting of the mantle during continental rifting. Our approach is to construct a unified numerical solution that merges an established lithospheric stretching model which determines the rate and depth at which melting occurs, with several compositional parameterisations of mantle melting to predict the composition of primary melts. We also incorporate a parameterisation for the rare earth elements. Using our approach, we are able to track the composition of the melt fractions and mantle residues as melting progresses. Our unified model shows that primary melt composition is sensitive to rift duration and mantle temperature, with rapid rifting and higher mantle temperatures producing larger melt fractions, at a greater mean pressure of melting, than slower/cooler rifting. Comparison of the model results with primitive basalts recovered from oceanic spreading ridges and rifted margins in the North Atlantic indicates that rift duration and synrift mantle temperature can be inferred independently from the appropriate geochemical data. Article in Journal/Newspaper North Atlantic Natural Environment Research Council: NERC Open Research Archive Earth and Planetary Science Letters 278 1-2 26 39 |
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Open Polar |
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Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
We present an integrated kinematic and geochemical model that determines the composition of melts and their residual source rocks generated by decompression melting of the mantle during continental rifting. Our approach is to construct a unified numerical solution that merges an established lithospheric stretching model which determines the rate and depth at which melting occurs, with several compositional parameterisations of mantle melting to predict the composition of primary melts. We also incorporate a parameterisation for the rare earth elements. Using our approach, we are able to track the composition of the melt fractions and mantle residues as melting progresses. Our unified model shows that primary melt composition is sensitive to rift duration and mantle temperature, with rapid rifting and higher mantle temperatures producing larger melt fractions, at a greater mean pressure of melting, than slower/cooler rifting. Comparison of the model results with primitive basalts recovered from oceanic spreading ridges and rifted margins in the North Atlantic indicates that rift duration and synrift mantle temperature can be inferred independently from the appropriate geochemical data. |
format |
Article in Journal/Newspaper |
author |
Dean, S.M. Murton, B.J. Minshull, T.A. Henstock, T.J. White, R.S. |
spellingShingle |
Dean, S.M. Murton, B.J. Minshull, T.A. Henstock, T.J. White, R.S. An integrated kinematic and geochemical model to determine lithospheric extension and mantle temperature from syn-rift volcanic compositions |
author_facet |
Dean, S.M. Murton, B.J. Minshull, T.A. Henstock, T.J. White, R.S. |
author_sort |
Dean, S.M. |
title |
An integrated kinematic and geochemical model to determine lithospheric extension and mantle temperature from syn-rift volcanic compositions |
title_short |
An integrated kinematic and geochemical model to determine lithospheric extension and mantle temperature from syn-rift volcanic compositions |
title_full |
An integrated kinematic and geochemical model to determine lithospheric extension and mantle temperature from syn-rift volcanic compositions |
title_fullStr |
An integrated kinematic and geochemical model to determine lithospheric extension and mantle temperature from syn-rift volcanic compositions |
title_full_unstemmed |
An integrated kinematic and geochemical model to determine lithospheric extension and mantle temperature from syn-rift volcanic compositions |
title_sort |
integrated kinematic and geochemical model to determine lithospheric extension and mantle temperature from syn-rift volcanic compositions |
publishDate |
2009 |
url |
http://nora.nerc.ac.uk/id/eprint/164930/ https://nora.nerc.ac.uk/id/eprint/164930/1/dean_etal_2009.pdf https://doi.org/10.1016/j.epsl.2008.11.012 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://nora.nerc.ac.uk/id/eprint/164930/1/dean_etal_2009.pdf Dean, S.M.; Murton, B.J. orcid:0000-0003-1522-1191 Minshull, T.A.; Henstock, T.J.; White, R.S. 2009 An integrated kinematic and geochemical model to determine lithospheric extension and mantle temperature from syn-rift volcanic compositions. Earth and Planetary Science Letters, 278 (1-2). 26-39. https://doi.org/10.1016/j.epsl.2008.11.012 <https://doi.org/10.1016/j.epsl.2008.11.012> |
op_doi |
https://doi.org/10.1016/j.epsl.2008.11.012 |
container_title |
Earth and Planetary Science Letters |
container_volume |
278 |
container_issue |
1-2 |
container_start_page |
26 |
op_container_end_page |
39 |
_version_ |
1766131478606905344 |