Geophysical characterisation of two segments of the Møre-Trøndelag Fault Complex, Mid Norway
The Møre-Trøndelag Fault Complex (MTFC) has controlled the tectonic evolution of Mid Norway and its shelf for the past 400 Myr through repeated reactivations during Palaeozoic, Mesozoic and perhaps Cenozoic times, the very last phase of reactivation involving normal to oblique-slip faulting. Despite...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2011-07-01
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| Series: | Solid Earth |
| Online Access: | http://www.solid-earth.net/2/125/2011/se-2-125-2011.pdf |
| _version_ | 1818996981755805696 |
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| author | A. Nasuti C. Pascal J. Ebbing J. F. Tønnesen |
| author_facet | A. Nasuti C. Pascal J. Ebbing J. F. Tønnesen |
| author_sort | A. Nasuti |
| collection | DOAJ |
| description | The Møre-Trøndelag Fault Complex (MTFC) has controlled the tectonic evolution of Mid Norway and its shelf for the past 400 Myr through repeated reactivations during Palaeozoic, Mesozoic and perhaps Cenozoic times, the very last phase of reactivation involving normal to oblique-slip faulting. Despite its pronounced signature in the landscape, its deep structure has largely remained unresolved until now. We focused on two specific segments of the MTFC (i.e. the Tjellefonna and Bæverdalen faults) and acquired multiple geophysical datasets (i.e. gravity, magnetic, resistivity and shallow refraction profiles). <br><br> A 100–200 m-wide zone of gouge and/or brecciated bedrock steeply dipping to the south is interpreted as being the Tjellefonna fault sensu stricto. The fault appears to be flanked by two additional but minor damage zones. A secondary normal fault also steeply dipping to the south but involving indurated breccias was detected ~1 km farther north. The Bæverdalen fault, ~12 km farther north, is interpreted as a ~700 m-wide and highly deformed zone involving fault gouge, breccias and lenses of intact bedrock. As such, it is probably the most important fault segment in the studied area and accommodated most of the strain during presumably Late Jurassic normal faulting. Our geophysical data are indicative of a Bæverdalen fault dipping steeply towards the south, in agreement with the average orientation of the local tectonic grain. Our findings suggest that the influence of Mesozoic normal faulting along the MTFC on landscape development is more complex than previously thought. |
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| format | Article |
| id | doaj.art-8e772bb387f94992ae26c8dfe7ad1e06 |
| institution | Directory Open Access Journal |
| issn | 1869-9510 1869-9529 |
| language | English |
| last_indexed | 2024-12-20T21:38:23Z |
| publishDate | 2011-07-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Solid Earth |
| spelling | doaj.art-8e772bb387f94992ae26c8dfe7ad1e062022-12-21T19:25:52ZengCopernicus PublicationsSolid Earth1869-95101869-95292011-07-012212513410.5194/se-2-125-2011Geophysical characterisation of two segments of the Møre-Trøndelag Fault Complex, Mid NorwayA. NasutiC. PascalJ. EbbingJ. F. TønnesenThe Møre-Trøndelag Fault Complex (MTFC) has controlled the tectonic evolution of Mid Norway and its shelf for the past 400 Myr through repeated reactivations during Palaeozoic, Mesozoic and perhaps Cenozoic times, the very last phase of reactivation involving normal to oblique-slip faulting. Despite its pronounced signature in the landscape, its deep structure has largely remained unresolved until now. We focused on two specific segments of the MTFC (i.e. the Tjellefonna and Bæverdalen faults) and acquired multiple geophysical datasets (i.e. gravity, magnetic, resistivity and shallow refraction profiles). <br><br> A 100–200 m-wide zone of gouge and/or brecciated bedrock steeply dipping to the south is interpreted as being the Tjellefonna fault sensu stricto. The fault appears to be flanked by two additional but minor damage zones. A secondary normal fault also steeply dipping to the south but involving indurated breccias was detected ~1 km farther north. The Bæverdalen fault, ~12 km farther north, is interpreted as a ~700 m-wide and highly deformed zone involving fault gouge, breccias and lenses of intact bedrock. As such, it is probably the most important fault segment in the studied area and accommodated most of the strain during presumably Late Jurassic normal faulting. Our geophysical data are indicative of a Bæverdalen fault dipping steeply towards the south, in agreement with the average orientation of the local tectonic grain. Our findings suggest that the influence of Mesozoic normal faulting along the MTFC on landscape development is more complex than previously thought.http://www.solid-earth.net/2/125/2011/se-2-125-2011.pdf |
| spellingShingle | A. Nasuti C. Pascal J. Ebbing J. F. Tønnesen Geophysical characterisation of two segments of the Møre-Trøndelag Fault Complex, Mid Norway Solid Earth |
| title | Geophysical characterisation of two segments of the Møre-Trøndelag Fault Complex, Mid Norway |
| title_full | Geophysical characterisation of two segments of the Møre-Trøndelag Fault Complex, Mid Norway |
| title_fullStr | Geophysical characterisation of two segments of the Møre-Trøndelag Fault Complex, Mid Norway |
| title_full_unstemmed | Geophysical characterisation of two segments of the Møre-Trøndelag Fault Complex, Mid Norway |
| title_short | Geophysical characterisation of two segments of the Møre-Trøndelag Fault Complex, Mid Norway |
| title_sort | geophysical characterisation of two segments of the more trondelag fault complex mid norway |
| url | http://www.solid-earth.net/2/125/2011/se-2-125-2011.pdf |
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