Geophysical Characterization of the Canadian Cordillera
Summary
The Canadian Cordillera extends along western North America as a complex orogenic belt formed by the accretion and collision of diverse terranes against the craton. Geophysical characterisation integrates seismic, gravity, magnetic and electromagnetic methods to map crustal thickness, lithospheric structure and deep tectonic boundaries. Seismic tomography and receiver-function analyses image variations in P- and S-wave velocities that reflect changes in rock composition, temperature and deformation style. Gravity and magnetic inversion techniques constrain density contrasts across the Moho and reveal the geometry of crustal lineaments and lithospheric thinning. Magnetotelluric surveys further delineate zones of enhanced conductivity linked to fluids or partial melt. Together, these approaches refine models of terrane assembly, mantle suturing and lithosphere–asthenosphere interactions, with implications for seismic hazard assessment, mineral exploration and geothermal resource evaluation.
Research from Nature Portfolio
New seismic imaging of P- and S-wave velocities has revealed a sharp, steeply dipping boundary in the uppermost mantle beneath the southern Canadian Cordillera. This boundary coincides with a proposed cryptic suture zone and provides compelling evidence favouring a collisional assembly of the Cordillera rather than a simple accretionary model. Velocity contrasts along this discontinuity illuminate the structural complexity of the Cordillera–craton margin and underscore the role of deep-seated processes in orogenic development.
Geophysical Characterization of the Canadian Cordillera publication trend
The graph below shows the total number of articles in geophysical characterization of the canadian cordillera across all publications each year (not limited to Nature Index journals).
Technical terms
Seismic tomography: Imaging of Earth’s interior based on variations in seismic wave speeds.
Gravity inversion: Computational technique to infer subsurface density distribution from gravity anomalies.
Moho: The Mohorovičić discontinuity separating crust from mantle.
Receiver functions: Analysis of converted seismic phases to determine depths and properties of subsurface interfaces.
Crustal lineament: Linear feature in the crust indicating faults or lithospheric boundaries.
Mantle suture: Zone in the mantle marking a past collisional boundary between tectonic blocks.
Lithosphere–asthenosphere boundary: The interface between rigid lithospheric mantle and the underlying ductile asthenosphere.
References
- Seismic evidence for a mantle suture and implications for the origin of the Canadian Cordillera. Nature Communications (2019).
- Geophysical reassessment of the role of ancient lineaments on the development of the western Laurentian margin and its sediment-hosted Zn–Pb deposits, Yukon and Northwest Territories, Canada. Canadian Journal of Earth Sciences (2021).
- Exploring the Moho beneath the Northern Canadian Cordillera, with seismically constrained gravity inversion. Canadian Journal of Earth Sciences (2023).
- Seismic Evidence for a Weakened Thick Crust at the Beaufort Sea Continental Margin. Geophysical Research Letters (2022).
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