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Distribution of crustal melt bodies at the hot spot-influenced section of the Galápagos Spreading Centre from seismic reflection images

Distribution of crustal melt bodies at the hot spot-influenced section of the Galápagos Spreading Centre from seismic reflection images
Distribution of crustal melt bodies at the hot spot-influenced section of the Galápagos Spreading Centre from seismic reflection images

Accretion of the lower crust at mid-ocean ridges is a debated topic, with modern seismic observations pointing to a complex magmatic system that includes an axial multisill system of middle- and lower-crustal melt lenses and near- and off-axis melt bodies. Here we revisit the hot spot-influenced section of the western Galápagos Spreading Centre and reprocess multichannel seismic reflection data using a wide-angle seismic tomography model. Our new images show that the magma reservoir in the lower crust at this ridge section is intruded with partially molten melt lenses. The images also show evidence for off-axis melt lenses, magmatic-hydrothermal interactions and Moho reflections in this region. We conclude that the similarities between the axial crustal structure of this hot spot-influenced mid-ocean ridge and the multisill magmatic structure imaged at the East Pacific Rise indicate that these features are common along the global mid-ocean ridge system where seafloor spreading is dominated by magmatic accretion.

0094-8276
4664-4673
Boddupalli, B.
20ded581-d378-4ab3-862e-c6f54a717701
Canales, J. P.
89d319c6-4ab3-4b95-ab35-f7c94c786884
Boddupalli, B.
20ded581-d378-4ab3-862e-c6f54a717701
Canales, J. P.
89d319c6-4ab3-4b95-ab35-f7c94c786884

Boddupalli, B. and Canales, J. P. (2019) Distribution of crustal melt bodies at the hot spot-influenced section of the Galápagos Spreading Centre from seismic reflection images. Geophysical Research Letters, 46 (9), 4664-4673. (doi:10.1029/2019GL082201).

Record type: Article

Abstract

Accretion of the lower crust at mid-ocean ridges is a debated topic, with modern seismic observations pointing to a complex magmatic system that includes an axial multisill system of middle- and lower-crustal melt lenses and near- and off-axis melt bodies. Here we revisit the hot spot-influenced section of the western Galápagos Spreading Centre and reprocess multichannel seismic reflection data using a wide-angle seismic tomography model. Our new images show that the magma reservoir in the lower crust at this ridge section is intruded with partially molten melt lenses. The images also show evidence for off-axis melt lenses, magmatic-hydrothermal interactions and Moho reflections in this region. We conclude that the similarities between the axial crustal structure of this hot spot-influenced mid-ocean ridge and the multisill magmatic structure imaged at the East Pacific Rise indicate that these features are common along the global mid-ocean ridge system where seafloor spreading is dominated by magmatic accretion.

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Accepted/In Press date: 22 April 2019
e-pub ahead of print date: 29 April 2019
Published date: 16 May 2019

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Local EPrints ID: 431447
URI: https://eprints.soton.ac.uk/id/eprint/431447
ISSN: 0094-8276
PURE UUID: fe0912c0-64cd-423c-969e-a84755579d90

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Date deposited: 04 Jun 2019 16:30
Last modified: 30 Oct 2019 05:01

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Contributors

Author: B. Boddupalli
Author: J. P. Canales

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