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Ductile shear zones related to crustal shortening and domain boundary evolution in the central Fennoscandian Shield

Högdahl, Karin LU ; Sjostrom, Hakan and Bergman, Stefan (2009) In Tectonics 28.
Abstract
The Paleoproterozoic part of the Fennoscandian Shield is composed of crustal components formed in different tectonic settings and generally separated by well-defined shear zone systems. An anomalous transitional boundary has been investigated by integrating structural analysis and geochronology with published geophysical data. The nature of this boundary is interpreted to be a consequence of an apparent stacking in the lower and middle crust initiating 1.87-1.86 Ga dextral shear along the Gavle-Rattvik Zone (GRZ) and adjacent shear zones, resulting in an arcuate northern boundary of the Bergslagen province. This boundary coincides with geophysical anomalies and temporal and metamorphic breaks. Owing to continuous convergence the pure-shear... (More)
The Paleoproterozoic part of the Fennoscandian Shield is composed of crustal components formed in different tectonic settings and generally separated by well-defined shear zone systems. An anomalous transitional boundary has been investigated by integrating structural analysis and geochronology with published geophysical data. The nature of this boundary is interpreted to be a consequence of an apparent stacking in the lower and middle crust initiating 1.87-1.86 Ga dextral shear along the Gavle-Rattvik Zone (GRZ) and adjacent shear zones, resulting in an arcuate northern boundary of the Bergslagen province. This boundary coincides with geophysical anomalies and temporal and metamorphic breaks. Owing to continuous convergence the pure-shear overprint component increased on the GRZ and caused a shift of dextral shear to the Hagsta Gneiss Zone with recorded shear at 1809 +/- 2 Ma. Most likely, both these structures are related to coeval shear zones farther to the east as a part of an similar to 1500 km long crustal, or possibly terrane, boundary. Citation: Hogdahl, K., H. Sjostrom, and S. Bergman (2009), Ductile shear zones related to crustal shortening and domain boundary evolution in the central Fennoscandian Shield, Tectonics, 28, TC1003, doi:10.1029/2008TC002277. (Less)
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author
organization
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Contribution to journal
publication status
published
subject
in
Tectonics
volume
28
publisher
American Geophysical Union
external identifiers
  • wos:000263180100001
  • scopus:67649588359
ISSN
0278-7407
DOI
10.1029/2008TC002277
language
English
LU publication?
yes
id
9fa9262b-f791-4c87-b982-053d90b34819 (old id 1372676)
date added to LUP
2009-05-08 13:39:41
date last changed
2017-08-27 04:51:20
@article{9fa9262b-f791-4c87-b982-053d90b34819,
  abstract     = {The Paleoproterozoic part of the Fennoscandian Shield is composed of crustal components formed in different tectonic settings and generally separated by well-defined shear zone systems. An anomalous transitional boundary has been investigated by integrating structural analysis and geochronology with published geophysical data. The nature of this boundary is interpreted to be a consequence of an apparent stacking in the lower and middle crust initiating 1.87-1.86 Ga dextral shear along the Gavle-Rattvik Zone (GRZ) and adjacent shear zones, resulting in an arcuate northern boundary of the Bergslagen province. This boundary coincides with geophysical anomalies and temporal and metamorphic breaks. Owing to continuous convergence the pure-shear overprint component increased on the GRZ and caused a shift of dextral shear to the Hagsta Gneiss Zone with recorded shear at 1809 +/- 2 Ma. Most likely, both these structures are related to coeval shear zones farther to the east as a part of an similar to 1500 km long crustal, or possibly terrane, boundary. Citation: Hogdahl, K., H. Sjostrom, and S. Bergman (2009), Ductile shear zones related to crustal shortening and domain boundary evolution in the central Fennoscandian Shield, Tectonics, 28, TC1003, doi:10.1029/2008TC002277.},
  author       = {Högdahl, Karin and Sjostrom, Hakan and Bergman, Stefan},
  issn         = {0278-7407},
  language     = {eng},
  publisher    = {American Geophysical Union},
  series       = {Tectonics},
  title        = {Ductile shear zones related to crustal shortening and domain boundary evolution in the central Fennoscandian Shield},
  url          = {http://dx.doi.org/10.1029/2008TC002277},
  volume       = {28},
  year         = {2009},
}