A metamorphic core complex (MCC) is a domed structure that results from the process of lithospheric extension and subsequent isostatic readjustment, during which process, the brittle upper crust breaks and is displaced along an extensional detachment fault, while ductile crustal materials (or even upper mantle) ascend from deeper levels and become exhumed in the footwall of the detachment fault (e.g., Brun et al., 2018;Ring, 2014;Whitney et al., 2013). The extensional detachment that bounds the MCC on its top typically displays a low-angle (<30°), domed morphology and soles into the deep ductile crustal layer, although it is usually considered to initiate within the brittle upper crust at steeper angles (e.g., Little et al., 2019;Mizera et al., 2019;Webber et al., 2020). The detachment fault finally places the upper crustal rocks and the low-grade or unmetamorphosed sedimentary sequences in the hanging-wall against the metamorphic or plutonic rocks exhumed from the brittle-ductile

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