domenestrukturer

DOMAINSTRUKTURER are geological structures that represent bounded areas within a larger region where the structural, lithological, or magmatic properties differ from the surrounding country rock. These domains are typically bounded by fault or shear zones and can host distinct deformation patterns, metamorphic grades, or intrusive bodies. The term is commonly used in the context of tectonic studies in Scandinavia, the Andes, and other mountain belts where regional deformation is partitioned into multiple domains.

The most widely recognised form of domain structure is the deformation dome, in which uplifted blocks are surrounded by younger, undeformed strata. Sill‑domains form when magmatic intrusions create a patch of altered rock that disrupts the normal stratigraphic sequence. Synclinal domains are characterised by sagging blocks that accommodate thrust or reverse faults along the edges. In many cases, a given domain may contain several nested sub‑domains, reflecting successive tectonic events.

Domain structures have a major impact on seismic hazard assessment, as the bounding faults often control rupture propagation. They also influence the localisation of natural resources, such as hydrocarbons, mineral ore bodies, and groundwater reservoirs. The contrasting structural fabrics within a domain can modify porosity and permeability, affecting fluid flow.

Studying domain structures requires a combination of field mapping, geophysical imaging (seismic reflection, gravity, magnetics), and petrological analyses. Modern remote‑sensing techniques and GIS tools are increasingly employed to delineate domain boundaries over large scales. Continued research into their genesis and evolution remains essential for understanding regional tectonics and for effective exploration of geological resources.