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Evidence from three-dimensional seismic reflectivity images for enhanced melt supply beneath mid-ocean-ridge discontinuities

Evidence from three-dimensional seismic reflectivity images for enhanced melt supply beneath mid-ocean-ridge discontinuities
Evidence from three-dimensional seismic reflectivity images for enhanced melt supply beneath mid-ocean-ridge discontinuities
Quantifying the melt distribution and crustal structure across ridge-axis discontinuities is essential for understanding the relationship between magmatic, tectonic and petrologic segmentation of mid-ocean-ridge spreading centres. The geometry and continuity of magma bodies beneath features such as overlapping spreading centres can strongly influence the composition of erupted lavas and may give insight into the underlying pattern of mantle flow. Here we present three-dimensional images of seismic reflectivity beneath a mid-ocean ridge to investigate the nature of melt distribution across a ridge-axis discontinuity. Reflectivity slices through the 9° 03' N overlapping spreading centre on East Pacific Rise suggest that it has a robust magma supply, with melt bodies underlying both limbs and ponding of melt beneath large areas of the overlap basin. The geometry of melt distribution beneath this offset is inconsistent with large-scale, crustal redistribution of melt away from centres of upwelling. The complex distribution of melt seems instead to be caused by a combination of vertical melt transport from the underlying mantle and subsequent focusing of melt beneath a magma freezing boundary in the mid-crust.
SPREADING CENTRES, THREE DIMENSIONS, SEAFLOOR SPREADING, MAGMA CHAMBERS, MID OCEAN RIDGES, OCEAN CRUST, EAST PACIFIC RISE
0028-0836
614-618
Kent, G.M.
a5c64464-6e7a-4b17-9ebb-2a8e7a1891c7
Singh, S.C.
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Harding, A.J.
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Sinha, M.C.
794c3012-d0e8-4d2f-b328-c8cfd56c5976
Orcutt, J.A.
66df5264-9e8e-424a-9bb7-2b20347cb369
Barton, P.J.
d823de17-bb61-4e0d-8dcc-871aa490a504
White, R.S.
3919ea9f-a09d-43c2-93fa-c7986055e486
Bazin, S.
150a6d8c-8823-46ec-a147-a34fb46c4759
Hobbs, R.W.
a9a99163-c8a3-4d29-b673-61260be15157
Tong, C.H.
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Pye, J.W.
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Kent, G.M.
a5c64464-6e7a-4b17-9ebb-2a8e7a1891c7
Singh, S.C.
b23f1231-1b5d-4843-8b12-0d32fc7bc2c1
Harding, A.J.
68c8db79-a7b3-4f90-ab0b-7ab9b7eee619
Sinha, M.C.
794c3012-d0e8-4d2f-b328-c8cfd56c5976
Orcutt, J.A.
66df5264-9e8e-424a-9bb7-2b20347cb369
Barton, P.J.
d823de17-bb61-4e0d-8dcc-871aa490a504
White, R.S.
3919ea9f-a09d-43c2-93fa-c7986055e486
Bazin, S.
150a6d8c-8823-46ec-a147-a34fb46c4759
Hobbs, R.W.
a9a99163-c8a3-4d29-b673-61260be15157
Tong, C.H.
8ef72d4a-5121-4287-aa5d-3e95b68fdf8b
Pye, J.W.
7c892044-0268-44dd-a398-907c32fa9362

Kent, G.M., Singh, S.C., Harding, A.J., Sinha, M.C., Orcutt, J.A., Barton, P.J., White, R.S., Bazin, S., Hobbs, R.W., Tong, C.H. and Pye, J.W. (2000) Evidence from three-dimensional seismic reflectivity images for enhanced melt supply beneath mid-ocean-ridge discontinuities. Nature, 406 (6796), 614-618. (doi:10.1038/35020543).

Record type: Article

Abstract

Quantifying the melt distribution and crustal structure across ridge-axis discontinuities is essential for understanding the relationship between magmatic, tectonic and petrologic segmentation of mid-ocean-ridge spreading centres. The geometry and continuity of magma bodies beneath features such as overlapping spreading centres can strongly influence the composition of erupted lavas and may give insight into the underlying pattern of mantle flow. Here we present three-dimensional images of seismic reflectivity beneath a mid-ocean ridge to investigate the nature of melt distribution across a ridge-axis discontinuity. Reflectivity slices through the 9° 03' N overlapping spreading centre on East Pacific Rise suggest that it has a robust magma supply, with melt bodies underlying both limbs and ponding of melt beneath large areas of the overlap basin. The geometry of melt distribution beneath this offset is inconsistent with large-scale, crustal redistribution of melt away from centres of upwelling. The complex distribution of melt seems instead to be caused by a combination of vertical melt transport from the underlying mantle and subsequent focusing of melt beneath a magma freezing boundary in the mid-crust.

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Published date: 2000
Keywords: SPREADING CENTRES, THREE DIMENSIONS, SEAFLOOR SPREADING, MAGMA CHAMBERS, MID OCEAN RIDGES, OCEAN CRUST, EAST PACIFIC RISE

Identifiers

Local EPrints ID: 8731
URI: https://eprints.soton.ac.uk/id/eprint/8731
ISSN: 0028-0836
PURE UUID: c0101ce4-4db7-45ec-9e91-b35f18e7a09f

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Date deposited: 14 Sep 2004
Last modified: 17 Jul 2017 17:12

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Contributors

Author: G.M. Kent
Author: S.C. Singh
Author: A.J. Harding
Author: M.C. Sinha
Author: J.A. Orcutt
Author: P.J. Barton
Author: R.S. White
Author: S. Bazin
Author: R.W. Hobbs
Author: C.H. Tong
Author: J.W. Pye

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