Imperial College London
Alternate

Saskia Goes

Faculty of Engineering, Department of Earth Science & Engineering

Professor of Geophysics
 
 
 
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Contact

 

+44 (0)20 7594 6434s.goes

 
 
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Location

 

4.47Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Bie:2022:10.1016/j.epsl.2022.117535,
author = {Bie, L and Hicks, S and Rietbrock, A and Goes, S and Collier, J and Rychert, C and Harmon, N and Maunder, B},
doi = {10.1016/j.epsl.2022.117535},
journal = {Earth and Planetary Science Letters},
pages = {117535--117535},
title = {Imaging slab-transported fluids and their deep dehydration from seismic velocity tomography in the Lesser Antilles subduction zone},
url = {http://dx.doi.org/10.1016/j.epsl.2022.117535},
volume = {586},
year = {2022}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Volatiles play a pivotal role in subduction zone evolution, yet their pathways remain poorly constrained. Studying the Lesser Antilles subduction zone can yield new constraints, where old oceanic lithosphere formed by slow-spreading subducts slowly. Here we use local earthquakes recorded by the temporary VoiLA (Volatile recycling in the Lesser Antilles) deployment of ocean-bottom seismometers in the fore- and back-arc to characterize the 3-D seismic structure of the north-central Lesser Antilles subduction zone. Along the slab top, mapped based on seismicity, we find low Vp extending to 130–150 km depth, deeper than expected for magmatic oceanic crust. The slab's most prominent, elevated Vp/Vs anomalies are beneath the fore- and back-arc offshore Guadeloupe and Dominica, where two subducted fracture zones lie with the obliquely subducting boundary between Proto-Caribbean and Equatorial Atlantic lithosphere. These structures, therefore, enhance hydration of the oceanic lithosphere as it forms and evolves and the subsequent dehydration of mantle serpentinite when subducted. Above the slab, we image the asthenosphere wedge as a high Vp/Vs and moderate Vp feature, indicating slab-dehydrated fluids rising through the overlying cold boundary layer that might induce melting further to the west. Our results provide new evidence for the impact of spatially-variable oceanic plate formation processes on slab dehydration and mantle wedge volatile transfer that ultimately impact volcanic processes at the surface, such as the relatively high magmatic output observed on the north-central islands in the Lesser Antilles.
AU  - Bie,L
AU  - Hicks,S
AU  - Rietbrock,A
AU  - Goes,S
AU  - Collier,J
AU  - Rychert,C
AU  - Harmon,N
AU  - Maunder,B
DO  - 10.1016/j.epsl.2022.117535
EP  - 117535
PY  - 2022///
SN  - 0012-821X
SP  - 117535
TI  - Imaging slab-transported fluids and their deep dehydration from seismic velocity tomography in the Lesser Antilles subduction zone
T2  - Earth and Planetary Science Letters
UR  - http://dx.doi.org/10.1016/j.epsl.2022.117535
UR  - https://www.sciencedirect.com/science/article/pii/S0012821X22001716?via%3Dihub
UR  - http://hdl.handle.net/10044/1/96657
VL  - 586
ER  -
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