Crustal intrusion beneath the Louisville hotspot track
We report here the first detailed 2D tomographic image of the crust and upper mantle structure of a Cretaceous seamount that formed during the interaction of the Pacific plate and the Louisville hotspot. Results show that at ∼ 1.5 km beneath the seamount summit, the core of the volcanic edifice appe...
| Main Authors: | , , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
2010
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| _version_ | 1797091095486660608 |
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| author | Contreras-Reyes, E Grevemeyer, I Watts, A Planert, L Flueh, E Peirce, C |
| author_facet | Contreras-Reyes, E Grevemeyer, I Watts, A Planert, L Flueh, E Peirce, C |
| author_sort | Contreras-Reyes, E |
| collection | OXFORD |
| description | We report here the first detailed 2D tomographic image of the crust and upper mantle structure of a Cretaceous seamount that formed during the interaction of the Pacific plate and the Louisville hotspot. Results show that at ∼ 1.5 km beneath the seamount summit, the core of the volcanic edifice appears to be dominantly intrusive, with velocities faster than 6.5 km/s. The edifice overlies both high lower crustal (> 7.2-7.6 km/s) and upper mantle (> 8.3 km/s) velocities, suggesting that ultramafic rocks have been intruded as sills rather than underplated beneath the crust. The results suggest that the ratio between the volume of intra-crustal magmatic intrusion and extrusive volcanism is as high as ∼ 4.5. In addition, the inversion of Moho reflections shows that the Pacific oceanic crust has been flexed downward by up to ∼ 2.5 km beneath the seamount. The flexure can be explained by an elastic plate model in which the seamount emplaced upon oceanic lithosphere that was ∼ 10 Myr at the time of loading. Intra-crustal magmatic intrusion may be a feature of hotspot volcanism at young, hot, oceanic lithosphere, whereas, magmatic underplating below a pre-existing Moho may be more likely to occur where a hotspot interacts with oceanic lithosphere that is several tens of millions of years old. © 2009 Elsevier B.V. All rights reserved. |
| first_indexed | 2024-03-07T03:28:10Z |
| format | Journal article |
| id | oxford-uuid:b9c4556a-a70b-48eb-8d2b-fbd7385a2db6 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T03:28:10Z |
| publishDate | 2010 |
| record_format | dspace |
| spelling | oxford-uuid:b9c4556a-a70b-48eb-8d2b-fbd7385a2db62022-03-27T05:05:15ZCrustal intrusion beneath the Louisville hotspot trackJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:b9c4556a-a70b-48eb-8d2b-fbd7385a2db6EnglishSymplectic Elements at Oxford2010Contreras-Reyes, EGrevemeyer, IWatts, APlanert, LFlueh, EPeirce, CWe report here the first detailed 2D tomographic image of the crust and upper mantle structure of a Cretaceous seamount that formed during the interaction of the Pacific plate and the Louisville hotspot. Results show that at ∼ 1.5 km beneath the seamount summit, the core of the volcanic edifice appears to be dominantly intrusive, with velocities faster than 6.5 km/s. The edifice overlies both high lower crustal (> 7.2-7.6 km/s) and upper mantle (> 8.3 km/s) velocities, suggesting that ultramafic rocks have been intruded as sills rather than underplated beneath the crust. The results suggest that the ratio between the volume of intra-crustal magmatic intrusion and extrusive volcanism is as high as ∼ 4.5. In addition, the inversion of Moho reflections shows that the Pacific oceanic crust has been flexed downward by up to ∼ 2.5 km beneath the seamount. The flexure can be explained by an elastic plate model in which the seamount emplaced upon oceanic lithosphere that was ∼ 10 Myr at the time of loading. Intra-crustal magmatic intrusion may be a feature of hotspot volcanism at young, hot, oceanic lithosphere, whereas, magmatic underplating below a pre-existing Moho may be more likely to occur where a hotspot interacts with oceanic lithosphere that is several tens of millions of years old. © 2009 Elsevier B.V. All rights reserved. |
| spellingShingle | Contreras-Reyes, E Grevemeyer, I Watts, A Planert, L Flueh, E Peirce, C Crustal intrusion beneath the Louisville hotspot track |
| title | Crustal intrusion beneath the Louisville hotspot track |
| title_full | Crustal intrusion beneath the Louisville hotspot track |
| title_fullStr | Crustal intrusion beneath the Louisville hotspot track |
| title_full_unstemmed | Crustal intrusion beneath the Louisville hotspot track |
| title_short | Crustal intrusion beneath the Louisville hotspot track |
| title_sort | crustal intrusion beneath the louisville hotspot track |
| work_keys_str_mv | AT contrerasreyese crustalintrusionbeneaththelouisvillehotspottrack AT grevemeyeri crustalintrusionbeneaththelouisvillehotspottrack AT wattsa crustalintrusionbeneaththelouisvillehotspottrack AT planertl crustalintrusionbeneaththelouisvillehotspottrack AT fluehe crustalintrusionbeneaththelouisvillehotspottrack AT peircec crustalintrusionbeneaththelouisvillehotspottrack |