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The Storsjön-Edsbyn Deformation Zone, central Sweden: Research report of a project entitled: "The tectonometamorphic history of a major shear zone in central Sweden - integrated geological-geophysical study"
Geological Survey of Sweden.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
1994 (English)Report (Other academic)
Abstract [en]

A major, polyphase NNW-SSE-striking deformation zone in central Sweden, 15-30 km wide and >200 km long, apparently separates two major Proterozoic provinces. Four main phases of deformation have been recognized along the deformation zone; associated mylonites are characterized by their mineralogy, microstructures, kinematic patterns, magnetic signatures and relative ages.

Locally, metamorphic patterns developed during regional Svecofennian deformation and early shearing were significantly disturbed by later movements on mostly steep, greenschist facies deformation zones. As a result, previously unknown intermediate-high-pressure rocks were juxtaposed against low-pressure rocks more typical for the region. Also the geometry of the major, early Svecofennian Ljusdal Batholith, appears to be controlled by the shear zone and a previously unknown splay.

Rotation of planar structures indicates >10-20 km dextral displacement along plastic mylonites. Stress- and strain analysis of mesoscopic shear zone populations of different generations suggests that most displacements are compatible with N-S to NE-SW-oriented bulk regional shortening.

Most deformation occurred before intrusion of c. 1.2 Ga mafic dykes and sills. The existence of this deformation zone, however, significantly affected the depositional, metamorphic and structural evolution of the Caledonian orogen in this region.

Place, publisher, year, edition, pages
Uppsala: Uppsala University, 1994. , p. 46
National Category
Geology
Research subject
Earth Science with specialization in Mineral Chemistry, Petrology and Tectonics
Identifiers
URN: urn:nbn:se:uu:diva-331133OAI: oai:DiVA.org:uu-331133DiVA, id: diva2:1148457
Projects
The tectonometamorphic history of a major shear zone in central Sweden - integrated geological-geophysical study
Funder
The Geological Survey of Sweden (SGU)Swedish Research CouncilAvailable from: 2017-10-11 Created: 2017-10-11 Last updated: 2017-10-18Bibliographically approved

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CiteExportLink to record
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