NDLI: Conservatism of mineral magnetic signatures in farm dam sediments in the South African Karoo: the potential effects of particle size and post-depositional diagenesis

Content Provider	Springer Nature Link
Author	Pulley, Simon Rowntree, Kate Foster, Ian
Copyright Year	2015
Abstract	A methodology was developed to evaluate and mitigate the impacts of particle size and post-depositional diagenesis when using mineral magnetic signatures to trace the sources of historically deposited sediment in farm dams in the South African Karoo.Samples from a range of potential sediment sources were sieved to different particle size fractions, and the relationships between pairs of tracer signatures were established for each fraction. Non-conservatism of the magnetic signatures was determined by identifying whether the magnetic signatures of the farm dam sediments were within the range of those of the fractionated source samples. By fractionating the sediment source samples, the core samples were able to be traced using appropriately sized sources.It was found that strong relationships existed between the pairs of tracer signatures at all particle size fractions. Relationships in the <32 μm fraction were significantly different to that of coarser fractions. It was also found that particle size had a large effect on all magnetic signatures and would prove to be a large source of uncertainty if not accounted for within any methodology developed for quantitative source discrimination and source apportionment. There was very little non-conservatism caused by diagenetic or biogenic processes in six of the seven dams sampled. In one dam, there was evidence to suggest that dissolution had probably caused the loss of almost all small superparamagnetic and stable single-domain grains. The other signatures associated with coarser magnetic grains in this dam were generally unaffected by the dissolution processes.The good preservation of magnetic signatures suggests that they can make reliable tracers over historical timescales (up to 164 years) in the Karoo and similar semi-arid catchments. However, the mitigation of particle size effects and screening for post-depositional alteration is an essential part of their use. The methodology presented in this paper is a potential way of recognising tracer non-conservatism and limiting its effects in future studies.
Starting Page	2387
Ending Page	2397
Page Count	11
File Format	PDF
ISSN	14390108
Journal	Journal of Soils and Sediments
Volume Number	15
Issue Number	12
e-ISSN	16147480
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-10-02
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Historically deposited sediment Karoo Mineral magnetic signatures Non-conservatism Particle size Soil Science & Conservation Environment Environmental Physics
Content Type	Text
Resource Type	Article
Subject	Stratigraphy Earth-Surface Processes

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