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Crustal intrusion beneath the Louisville hotspot track.
Contreras-Reyes, Eduardo, Grevemeyer, Ingo , Watts, A. B., Planert, Lars, Flueh, Ernst R. and Peirce, C. (2010) Crustal intrusion beneath the Louisville hotspot track. Earth and Planetary Science Letters, 289 . pp. 323-333. DOI 10.1016/j.epsl.2009.11.020.
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Abstract
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.
Document Type: | Article |
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Keywords: | Hotspots, Louisville Ridge, intrusion, crustal structure, gravity anomalies, flexure |
Research affiliation: | OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics |
Refereed: | Yes |
Open Access Journal?: | No |
Publisher: | Elsevier |
Projects: | Future Ocean |
Expeditions/Models/Experiments: | |
Date Deposited: | 11 Jan 2010 10:37 |
Last Modified: | 23 Sep 2019 21:53 |
URI: | https://oceanrep.geomar.de/id/eprint/3498 |
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