Correlation of Landsat lineaments in the south-western margin of the Baltic Shield

Abstract

This study is essentially devoted to the area covered by the Landsat scene 1330–09521 (province of Värmland, parts of the provinces of Dalarna and Västmanland, Sweden). The south-western margin of the Baltic Shield is traversed by a large number of lineaments. The lineament density is approximately twice the density in the neighbouring part of the Svecokarelian principal unit. The angular distribution in the south-western principal unit is more pronouncedly clustered into the range N15W-N30W than in the Svecokarelian unit. The distribution is not unimodal in any of the units. Where checked in the field, the linear structures often constitute localized zones frequently connected with breaks between lithologies. Normally rock structures such as schistosities, fold axes, etc. do not show up. The lineaments are probably due to tectonic movements, which have influenced the bedrock during a large part of its history. Lineaments are observed to cut through the youngest sediment, and to offset the Mylonite Zone, but they also control the intrusion pattern of earlier plutonics.

Keywords:

• Landsat
• lineaments
• age
• Eastern Pregothian mega-unit
• Western Pregothian mega-unit
• Åmål mega-unit
• Gillberga Synform
• Mylonite Zone
• Baltic Shield
• Sveconorwegian
• Svecokarelian
• Proterozoic
• Värmland
• Dalarna
• Västmanland
• south-western Sweden
• N5905 N6035 E1540 E1215