|
Research and
publications PhD Magnus
Johansson |
Forskning och
publikationer
I´m a senior
lecturer at the department of Earth Science and Geography,
division of Environmental Sciences at Karlstad university. |
|
|
|
|
Forskningsämne: |
Geomorfologi är
läran om hur landformer och landskap har uppkommit genom
processer som t.ex. vittring, massrörelser, rinnande vatten,
vågor, glaciärer och vindens verkan. Min forskning behandlar
berggrundens ytformer i olika skalor i främst sydvästra Sverige.
Studier av relationen mellan vittringens betydelse under 10-tals
miljoner år och kvartärtidens (ca. 1.8 miljoner år) nedisningar
är av särskilt intresse.
|
|
|
|
|
Research interests:
|
Longterm landform evolution, granite
landforms, the relation between preglacially deep-weathered and etched
landscapes / landforms and the subsequent Quaternary glacial reshaping.
My research areas are mainly located
in SW Sweden, where there is a mosaic of landscapes different in age
and relief characteristics. |
|
|
|
|
In Bohuslän, southwest
Sweden, the granite has been deeply weathered during Mesozoic
times and subsequently stripped from saprolite. The etched
basins are guided by a rhombic joint system. Intermediate-scale
glacial (Quaternary) erosional landforms are ubiquitous,
resembling a typical "knock and lochan" topography. |
 |
Ongoing projects
Sheet structures
in granite and their relation to landform evolution and existing relief.
The importance of
sheeting is mapped out at Ramsvik, south-west Sweden. Chronological
ordering between sheeting and landforms in different scales. Other
participant in this study: Dr. Mats Olvmo, Dep. of Earth Sciences,
Göteborg University, Sweden.
Structurally controlled basin
development in gneiss and granite within a Mesozoic etchsurface,
south-west Sweden.
Studies of how deep
weathering is guided by rock structure in two different lithologies.
Other participant in this study: Dr. Piotr Migon, Dep. of Geography,
University of Wroclaw, Poland.
Evidence of limited glacial erosion
in south-west Sweden.
Preglacially etched
relief is related to the subsequent glacial reshaping in different
scales, regarding both time and space.
Preglacial
and/or
glacial formation of Precambrian basement rock morphology in SW
Sweden: Cosmogenic radionuclide evidence for glacial erosion rates
An attempt to quantify
glacial abrasion on relict bedrock surfaces in south-west Sweden. Other
participants in this study: Dr. Derek Fabel, School of Earth Sciences,
The University of Melbourne, Australia; Prof. Jonathan Harbor, Dep. of
Earth and Atmospheric Sciences, Purdue University, USA; Dr. Arjen
Stroeven, Dep. of Physical Geography, Stockholm University, Sweden.
Mineralogy and geochemistry of in
situ weathered Bohus granite in south-west Sweden: implications for
landform evolution.
Analyses (SEM, XRD, etc.) of clay or gruss-weathered granite, found in
up to 1.5m wide joints. The area has the character of a typical "knock
and lochan" landscape, initially formed by etchprocesses during the
Mesozoic era and subsequently glacially reshaped to a limited extent
during the Quaternary. Other participants in this study: Dr. Siv Olsson,
Dep. of Quaternary Geology, Lund University, Sweden; Thomas Eliasson,
Swedish Geological Survey, Göteborg, Sweden.
|
|
A selection of publications |
|
Johansson, M., Olvmo, M. & Söderström, M.,
1999.
Application of digital elevation
and geological
data in studies of morphotectonics and relief - a case study of
the
sub-Cambrian peneplain in SW Sweden.
Zeitschrift für
Geomorphologie N.F., 43 (4): 505-520.
|
| |
|
|
Johansson, M.,
1999.
Analysis of digital elevation
data for palaeosurfaces in south-western Sweden. Geomorphology,
26: 279-295.
|
| |
|
|
Johansson, M., Olvmo, M.
& Lidmar-Bergström, K., 2001: Inherited landforms and glacial impact
of different palaeosurfaces in southwest Sweden. Geografiska Annaler,
83A: 67-89. |
| |
|
|
Johansson, M.,
Migon, P. & Olvmo, M.,
2001.
Joint-controlled basin development in
Bohus granite, SW Sweden. Geomorphology, 40 (1-2):
145-161. |
| |
|
|
Olvmo, M. & Johansson,
M., 2002.
The significance of rock structure, lithology and pre-glacial
relief for the shape of intermediate-scale glacial erosional landforms.
Earth
Surface Processes and Landforms,
27: 251-268.
back to top of page
|
|
