Impact of crust–mantle mechanical coupling on the topographic and thermal evolutions during the necking phase of ‘magma-poor’ and ‘sediment-starved’ rift systems: A numerical modeling study

Abstract

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The syn‐rift tectono‐stratigraphic record of rifted margins (Part II): A new model to break through the proximal/distal interpretation frontier

“…the future necking and hyperextended domains) during the necking phase (see erosional unconformity in Figure 5c,d,g5; Chenin et al., 2019). Uplift of the keystone may be further increased by the thermal erosion related to the asthenosphere upwelling beneath the rift system (Chenin et al, 2020).…”

The syn‐rift tectono‐stratigraphic record of rifted margins (Part I): Insights from the Alpine Tethys

“…Understanding and linking crustal thinning (BB2), mantle exhumation (BB6), and uplift and subsidence of the future distal margin (BB3) during the evolution of the Alpine Tethys rifting became possible thanks to the use of numerical modelling (Chenin, Manatschal, et al., 2019; Chenin et al., 2020). Finally, to link massive breccia‐bodies with rift models and define the corresponding BB5, a detailed tectono‐stratigraphic investigation of the distal European margin was necessary (Ribes, Ghienne, et al., 2019).…”

“…Uplift of the domain in‐between, the so‐called Briançonnais domain, can also be observed, resulting in a major unconformity that can be mapped along the margin and that is of necking age. Numerical modelling suggests that necking‐related uplift occurs when the upper lithospheric mantle, considered as the strongest layer within the lithosphere, yields beneath a little‐thinned continental crust (Chenin, Manatschal, et al., 2019; Chenin et al., 2020). This event is followed by a flexural rebound that can potentially lead to the emersion of formerly marine regions.…”

Is there a Speed Limit for the Thermal Steady-State Assumption in Continental Rifts?

“…Lane, 1923;Heckenbach et al, 2019] as well as lithospheric-scale perturbations related to the tectonic evolution [e.g. Peacock, 1996;Artemieva, 2009;Smye et al, 2019;Chenin et al, 2020]. Transient perturbations of the thermal field should hence be mainly expected in active plate boundary settings where tectonic deformation, heat advection, and changing heat source distributions would generate time-dependent temperature fields [e.g.…”