Geology of the Meråker area as a key to the eastern part of the Trondheim region.

Abstract

The present paper deals with a discussion of the main tectono-stratigraphical problems of the eastern Trondheim region. Based on detailed studies made in the Meråker area in the last three summers and available manuscript maps and personal communications from geologists working in the southern parts of the region, it has been possible to establish a general stratigraphy for this eastern region and revise the stratigraphical nomenclature, distinguishing the Gula Schist Group from the Røros Schist. It is also pointed out that on evidence pricipally from the northern half of the region, the former \"Trondheim synclinorium\" has to be regarded as an anticlinorium. It is shown that a major thrust plane occurs along the large part of the border of the Trondheim region and the term \"Trondheim nappe\" is suggesteed for the allochtonous metasedimentary sequence above this plane. The occurence of serpentinite bodies along the thrust plane is discussed, as is the distribution of the pyritic and chalcopyritic ores over the entire Trondheim region.