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Development of joint-controlled rock basins in Bohus granite, SW Sweden
Karlstad University, Faculty of Social and Life Sciences, Centre for Climate and Safety.
2001 (English)In: Geomorphology, Vol. 40, p. 145-161Article in journal (Refereed)
Abstract [en]

The granite area of Bohuslän along the Swedish west-coast is characterised by an abundance of rock basins of different sizes. Within a 163 km2 large part of the area over 400 basins occur, ranging in size from less than 0.005 km2 up to almost 2 km2. These basins were measured, described and classified from air-photos according to their length, width, area, altitude, shape, boundaries, openness and relation to joint configuration. The depth of basins was collected from digital elevation data. Their distributions and shapes are clearly associated with the visible jointing patterns, as shown by their location along joints or joint intersections, by joint-guided enlargement and similarity between directions of long axis of basins and principal tectonic lineaments in the Bohus granite. The patterns and characteristics of basins suggest that deep selective weathering had been the primary process involved in the origin and evolution of basins. Later they have been reshaped and possibly stripped of saprolites by glacial processes in the Pleistocene. Dating of deep weathering responsible for basin initiation and origin is difficult, although the complex story of Mesozoic weathering, Late Cretaceous burial and Late Tertiary exhumation is not without support

Place, publisher, year, edition, pages
2001. Vol. 40, p. 145-161
Keywords [en]
rock basin, granite, deep weathering, etching, joint control
National Category
Physical Geography
Research subject
Physical Geography
Identifiers
URN: urn:nbn:se:kau:diva-18305OAI: oai:DiVA.org:kau-18305DiVA, id: diva2:591935
Available from: 2013-01-21 Created: 2013-01-21 Last updated: 2018-01-11

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Johansson, Magnus

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