Fig. 4


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A. Cross sections showing the current crustal structure and tectono-stratigraphic architecture at the Le Danois High and at the Labourd Massif. B. Schematic cross-section displaying an attempt of a qualitative restoration of the Le Danois High at the end of rifting. The section illustrates the geometry of the Le Danois brittle-ductile transition (Le Danois BDT), the Le Danois Extensional Detachment System (LDD) and overlying extensional allochthons, accounting for the juxtaposition and succession of discontinuous pre-rift strata onto exhumed granulites and the occurrence of conglomerates and breccias including clasts of reworked granulites downslope. C. 2D numerical model showing the mechanisms of crustal exhumation processes (after Duretz et al., 2016). In the model, analogous structures to the NMD, SMD, LDD, and LLD extensional detachment systems, and to the LSZ and the Le Danois BDT are delineated and labelled.

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