Major features the Proterozoic of the Göteborg region Sweden

Abstract

A compilation of previous and current work in the Proterozoic of the Göteborg region is given in a sketch map. It is concluded that the area to the west of the Mylonite Zone can be treated as a geological unit with the Stora Le-Marstrand supracrustal formation as the oldest component. It was intruded by tonalitic to granitic magmas 1700–1600 Ma ago. These plutons were folded and migmatized before the next period with plutonic intrusions at about 1400 Ma. Compression from west to east with mylonitization followed by folding and migmatization characterized the next period. This metamorphic event ended with the intrusion of granitic batholiths at about 1220 Ma. A major crustal break-up with general uplift, basic dike swarms, erosion and deposition of the Dal Group to the north occurred before the culmination of the Sveconorwegian regeneration at 1000–1060 Ma.

Key Words:

• Areal geology
• Srora Le-Marstrand formation
• Dal Group
• Sveconorwegian
• Proterozoic
• Göteborg
• western Västergötland
• southwestern Bohuslän
• northwestern Halland
• southwestern Sweden
• N5725 N5805 E1230 E1130