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Development of granite sheet fractures in response to long-term morphotectonic evolution in SW Sweden
Karlstad University, Faculty of Social and Life Sciences, Centre for Climate and Safety.
2005 (English)Conference paper, (Refereed)
Abstract [en]

Configuration of granite sheet fractures has been reconstructed for the island Ramsvik (c. 9 km²) at the Swedish west-coast. The reconstruction suggests that the sheeting once formed eight antiformal domes separated by valleys or basin-like depressions connected with a rhombic joint pattern. Today the domes are dissected and eroded into c.70 separate hills. Long-term landform development invol-ves Mesozoic deep weathering with subsequent stripping of saprolite and Quaternary glacial reshap-ing of ancient relief. Same type of sheet structures has developed through both 920 Ma granite and a 50-70 m wide Permian rhomb porphyry dyke, which constrain their oldest possible age. We suggest that this type of large scale sheet structures results from vertical unloading of rocks that formed at depth under high triaxial compression. Thick sequences of coarse clastic sediments in Triassic rift basins westwards indicate that unloading of Palaeozoic cover rocks occurred after uplift and erosion. The unloading released the high N-S crustal compression built up in the granite during the Variscan tectonic regime. Mesozoic differential weathering and stripping exposed the domical relief before renewed burial beneath cover rocks in connection with the Late Cretaceous transgression. It is un-certain when exhumation of the Mesozoic surface started, with a possible second weathering phase, but studies of sediment compaction offshore point at a Neogene uplift in the area

Place, publisher, year, edition, pages
2005.
Keyword [en]
Sheet fractures, etched landforms, morphotectonic
National Category
Physical Geography
Research subject
Physical Geography
Identifiers
URN: urn:nbn:se:kau:diva-18304OAI: oai:DiVA.org:kau-18304DiVA: diva2:591934
Conference
Sixth international conference on geomorphology, Zaragoza, Spain, 2005
Available from: 2013-01-21 Created: 2013-01-21 Last updated: 2013-01-21

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Citation style
  • apa
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  • de-DE
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  • nn-NO
  • nn-NB
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Output format
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  • asciidoc
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