y2020m01b6550
20200129094500
assa
nadine@assaf.org.za
assa
South African Journal of Science
S. Afr. J. Sci
1996-7489
01292020
116
1/2
Detailed palaeomagnetic record at Rose Cottage Cave, South Africa: Implications for the Holocene geomagnetic field behaviour and chronostratigraphy
Hugo G.
Nami
CONICET-IGEBA, Department of Geological Sciences, University of Buenos Aires, Buenos Aires, Argentina
Carlos A.
Vasquez
CONICET-IGEBA, Department of Geological Sciences, University of Buenos Aires, Buenos Aires, Argentina
Common Basic Cycle, University of Buenos Aires, Buenos Aires, Argentina
Lyn
Wadley
Evolutionary Studies Institute, University of the Witwatersrand, Johannesburg, South Africa
Paloma
de la Peña
Evolutionary Studies Institute, University of the Witwatersrand, Johannesburg, South Africa
http://orcid.org/0000-0001-9731-7001
Palaeomagnetic data from a sedimentary section spanning the Holocene and terminal Pleistocene (~13 kya) from Rose Cottage Cave, eastern Free State (South Africa), are reported. The palaeomagnetic analysis took into account rock magnetism and directional analysis. The former reveals that most samples show stable single domain and superparamagnetic particles of Ti-poor magnetite and haematite. Natural remanent magnetisation directions were determined by progressive alternating field demagnetisation methodology. Directional analysis shows normal directions between samples 18 to 39 and 85 to 92; however, during the Early and Late Holocene in samples principally from RC40 to 84 ‘anomalous’ directions occurred. There is a significant westward shift in declination of ~80°, and a conspicuous fluctuating inclination in the lower part of the section during the Early Holocene at ≥9.5 kya and before ~12.0/13.0 kya. This palaeomagnetic record might become a chronostratigraphical marker for latest Pleistocene/Holocene sedimentary deposits in South Africa. Our two new accelerator mass spectrometry radiocarbon dates for the sampled deposit are 9500±50 BP and 1115±30 BP.
01292020
1
10.17159/sajs.2016/crossmark
sajs.co.za
false
2019-07-08
2019-09-10
2020-01-29
https://creativecommons.org/licenses/by/4.0/
10.17159/sajs.2020/6550
20200129094500
https://www.sajs.co.za/article/view/6550
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https://www.sajs.co.za/article/view/6550/9704
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https://www.sajs.co.za/article/view/6550/9704
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https://www.sajs.co.za/article/view/6550/9704
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https://www.sajs.co.za/article/view/6550/9704
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https://www.sajs.co.za/article/view/6550/9704
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https://www.sajs.co.za/article/view/6550/9704
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https://www.sajs.co.za/article/view/6550/9704