Rowntree, K. M., Foster, I. D. L., Mighall, T. M., Van der Vaal, B., Du Preez, I. and Boardman, J. (2008) Post-European settlement impacts on erosion and land degradation; a case study using farm reservoir sedimentation in the Eastern Cape, South Africa. In: Schmidt, J. (ed.) Sediment Dynamics in Changing Environments. International Association of Hydrological Sciences Press. 9781901502848. pp. 139-142.
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Abstract:
We present data from a farm reservoir constructed in 1843, which retains a complete and undisturbed
sedimentary record exceeding 4 m in depth. A small number (27) of potential sediment sources were sampled
and characterised by their mineral magnetic fingerprints. Similar signatures were measured on the reservoir
sediments. While yet to be dated, analysis of mineral magnetic properties of the reservoir sediments suggest that
they contain significant quantities of super-paramagnetic minerals produced by pedogenesis, but are not strongly
overprinted by magnetic signatures that could be attributed to bacterial magnetite or greigite produced within the reservoir. Preliminary results from the source tracing show that the sediments are probably derived from
colluvial topsoils punctuated by inputs from river channels or badlands
Uncontrolled Keywords:
sediment sources; environmental magnetism; gamma-emitting radionuclides; Karoo; South Africa
Subjects:
Q Science > QE Geology > QE500 Dynamic and structural geology > QE570 Weathering. Erosion
G Geography. Anthropology. Recreation > GB Physical geography > GB400 Geomorphology. Landforms. Terrain > GB440.S6 Geomorphology of South Africa
Q Science > QE Geology > QE500 Dynamic and structural geology > QE571 Sedimentation and deposition
G Geography. Anthropology. Recreation > GB Physical geography > GB400 Geomorphology. Landforms. Terrain > GB440.S6 Geomorphology of South Africa
Q Science > QE Geology > QE500 Dynamic and structural geology > QE571 Sedimentation and deposition
Creators:
Rowntree, K. M., Foster, I. D. L., Mighall, T. M., Van der Vaal, B., Du Preez, I. and Boardman, J.
Editors:
Schmidt, J.
Publisher:
International Association of Hydrological Sciences Press
Faculties, Divisions and Institutes:
Date:
2008
Date Type:
Publication
Page Range:
pp. 139-142
Title of Book:
Sediment Dynamics in Changing Environments
Event Title:
International Commission on Continental Erosion/International Association of Hydrological Sciences (ICCE/IAHS) Symposium ‘Sediment Dynamics in Changing Environments’
Event Dates:
1-5 December 2008
Event Location:
Christchurch, New Zealand
Event Type:
Conference
Language:
English
ISBN:
9781901502848
Status:
Published / Disseminated
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