Implicit 3D structural analysis from field data and implicit element distribution modelling in the Gruvberget deposit Svappavaara

This thesis contains a 3D structural analysis of the Gruvberget iron ore deposit as well as surrounding area. The aim of the analysis was to shed light on the structural setting of the Svappavaara deposits and to investigate possible structural controls on mineralizing events and related hydrothermal alteration. Especially the element distribution of Cu was compared to the distribution of Fe in the Gruvberget mine in order to show possible structural controls on certain element distributions. Subsequently, this was reflected against local structural patterns. The work is based on structural field work performed in a traverse along the Kalix River, inside of the Gruvberget and Leveäniemi open pit mines as well as an unconstrained implicit 3D-model of structurally controlled chemical trends within the Gruvberget deposit based on drillhole data. The field work showed that the area was affected by at least three separate deformation events (two ductile followed by a later brittle event) resulting in foliated, folded and faulted rocks. The 3D structural analysis shows that the elemental trend for Fe is parallel to an early tectonic fabric that is correlatable to the first tectonic deformation in the area. This fabrics were subsequently transposed into a synformal shape. The current results suggest that that the Cu element distribution is near perpendicular to the Fe-trend.Validerat; 20160602 (global_studentproject_submitter