Discussion on 'Paleozoic sedimentation and Caledonian terrane architecture in NW Svalbard: indications from U–Pb geochronology and structural analysis' by Koglin et al. 2022 (JGS, 179, jgs2021-053).

In summary, the parsimonious explanation is that the mylonitic lineation is the LDZ transport direction, and that the LDZ is part of the larger Keisarhjelmen detachment, along with the overlying Wilhelmtinden mylonite zone (Fig. LDZ kinematics [8] describe a shallowly NNW-plunging lineation on the west-dipping mylonitic foliation (their fig. 8), but with uncertain kinematics as indicators were not observed. [8] present valuable new isotopic and field data regarding NW Spitsbergen's tectonic history, and propose the existence of the Germaniahalvøya terrane with Scandian (Late Caledonian) igneous activity and deformation. Within this terrane, the Lerner Deformation Zone (LDZ) is cast as an east-directed thrust, with the Liefdefjorden Migmatite Complex in the footwall and Lenerøyane Group metasediments above. [Extracted from the article]