Igneous sheet intrusions are segmented across several orders of magnitude, with segment tip geometry commonly considered indicative of the propagation mechanism (brittle or non-brittle).Proposed propagation mechanisms are inferred to represent host rock mechanical properties during initial magma emplacement; typically, these Duffles models do not account for segment sets that show a range of tip geometries within the same lithology.We present a detailed structural characterization of basaltic sill segments and their associated host rock deformation from the Little Minch Sill Complex, Isle of Skye, Denim UK, and a broader comparison with segment geometries in three additional intrusive suites (Utah, USA; and Mull and Orkney, UK).
Each separate host lithology shows multiple tip geometries and styles of host rock deformation, from elastic-brittle fracture, to viscous indentation and fluidisation.We attribute this range of host rock deformations to evolving conditions that occur at the tips both during sheet growth and arrest.