Abstract

A classification of igneous intrusions from orogenic zones is presented. Depending on the tectonic appearance of the intrusions (size, structure, contacts, ect.) these are divided into epi-, meso- and catatectonic diapirs. The Svecofennian of Central Sweden has been divided into tectonic units such as batholiths and subprovinces. The division is supported by the Bouguer anomalies. The geological situation of several of the batholiths in Central Sweden suggests a mechanism of formation which is described as polydiapirism or diapirism within diapirs. This means that younger granite diapirs have forced their way up through diapirically formed granitoid rocks and supracrustal septa. The driving force is the density contrast between the diapir and the surrounding rocks. A positive correlation exists for the different granitoid massives and the Bouguer anomalies. An interpretation of the gravity anomaly for one of the granite domes in a twin dome structure suggests that the late-kinematic granites extend to depths of about 18 km. Finally the theory of polydiapirism is applied to the evolution of the Svecofennian orogeny in Central Sweden.

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