Fig. 5: A Cordillera-craton transition model from S receiver functions.
From: Dual-layered mantle lithosphere beneath southeastern Canadian Cordillera
The side panels show averaged S receiver function (SRF)s for both the Cordillera and the North American (NA) craton and the horizontal blue lines mark the depths of mantle lithosphere. The averaged SRF of Cordillera reveals two comparable negative phases (10% amplitude difference) at 72 km and 207 km, which we interpret as the Cordillera Lithosphere-Asthenosphere Boundary (CLAB) and Laurentia Lithosphere-Asthenosphere Boundary (LLAB), respectively. On the other hand, SRF stack from the cratonic region shows a single (negative) peak at 214 km in connection with the LLAB. Interpreted Moho depths are shown by grey lines at ~35 km for the Cordillera and ~40 km for the NA craton. Arrows indicate inferred mantle flow in the study region. Relative to cratons, the Cordilleran SRF (red shading) suggests a dual-layered lithospheric architecture.
