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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Mesozoic and Cenozoic tectonics of the Møre Trøndelag Fault Complex, central Norway: Constraints from new apatite fission track data
Physics and Chemistry of the Earth, Volume 29, No. 10, Year 2004
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Description
The Møre Trøndelag Fault Complex (MTFC) of central Norway is a long-lived structural zone whose tectonic history included dextral strike slip, sinistral strike slip, and vertical offset. Determination of an offset history for the MTFC is complicated by the lack of well preserved stratigraphic markers. However, low temperature apatite fission track (AFT) thermochronology offers important new clues by allowing the determination of exhumation histories for individual fault blocks presently exposed within the MTFC area. Previously published AFT data from crystalline basement in and near the MTFC suggest the region has a complicated pattern of exhumation. We present new AFT data from a NW-SE transect perpendicular to the principal structural grain of the MTFC. FT analyses of 15 apatite samples yielded apparent ages between 90 and 300 Ma, with mean FT length ranging from 11.8 to 13.5 μm. Thermal models based upon the age and track length data show the MTFC is comprised by multiple structural blocks with individual exhumation histories that are discrete at the 2σ confidence level. Thermal modeling of the AFT data indicates exhumation progressed from west to east, and that the final juxtaposition and exhumation of the innermost blocks took place during Cretaceous or Tertiary (possibly Neogene) time. We suggest that least some of the fracture lineaments of central Norway were re-activated during Mesozoic extension and the opening of the Norwegian sea, and may have remained active into the Cenozoic. © 2004 Elsevier Ltd. All rights reserved.
Authors & Co-Authors
Redfield, Thomas Fitz Maurice
Norway, Trondheim
Geological Survey of Norway
Netherlands, Amsterdam
Vrije Universiteit Amsterdam
Torsvik, Trond H.
Norway, Trondheim
Geological Survey of Norway
Andriessen, Paul A.M.
Netherlands, Amsterdam
Vrije Universiteit Amsterdam
Gabrielsen, Roy Helge
Norway, Bergen
Universitetet I Bergen
Statistics
Citations: 44
Authors: 4
Affiliations: 3
Identifiers
Doi:
10.1016/j.pce.2004.03.005
ISSN:
14747065