Articles | Volume 11, issue 2
Research article
22 Apr 2020
Research article |  | 22 Apr 2020

Seismic reflection data reveal the 3D structure of the newly discovered Exmouth Dyke Swarm, offshore NW Australia

Craig Magee and Christopher Aiden-Lee Jackson

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Cited articles

Anderson, E. M.: The dynamics of faulting and dyke formation with applications to Britain, Hafner Pub. Co., Edinburgh, 206 pp., 1951. 
Ardakani, E. P., Schmitt, D. R., and Currie, C. A.: Geophysical evidence for an igneous dike swarm, Buffalo Creek, Northeast Alberta, Geol. Soc. Am. Bull., 130, 1059–1072, 2017. 
Baragar, W., Ernst, R., Hulbert, L., and Peterson, T.: Longitudinal petrochemical variation in the Mackenzie dyke swarm, northwestern Canadian Shield, J. Petrol., 37, 317–359, 1996. 
Bilal, A., McClay, K., and Scarselli, N.: Fault-scarp degradation in the central Exmouth Plateau, North West Shelf, Australia, Geol. Soc. Lond. Spec. Publ., 476, SP476.411, 27 pp., 2018. 
Black, M., McCormack, K., Elders, C., and Robertson, D.: Extensional fault evolution within the Exmouth Sub-basin, North West Shelf, Australia, Mar. Petrol. Geol., 85, 301–315, 2017. 
Short summary
Injection of vertical sheets of magma (dyke swarms) controls tectonic and volcanic processes on Earth and other planets. Yet we know little of the 3D structure of dyke swarms. We use seismic reflection data, which provides ultrasound-like images of Earth's subsurface, to study a dyke swarm in 3D for the first time. We show that (1) dyke injection occurred in the Late Jurassic, (2) our data support previous models of dyke shape, and (3) seismic data provides a new way to view and study dykes.