Palaeomagnetic results and new dates of sedimentary deposits from Klasies River Cave 1, South Africa
Palaeomagnetic data from Klasies River main site Cave 1 (Eastern Cape Province, South Africa) are reported. Natural remanent magnetisation directions obtained from 77 oriented samples were determined by progressive alternating field demagnetisation methodology. Three palaeomagnetic samplings from th...
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| Format: | Article |
| Language: | English |
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Academy of Science of South Africa
2016-11-01
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| Series: | South African Journal of Science |
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| Online Access: | https://www.sajs.co.za/article/view/3680 |
| _version_ | 1818836033529184256 |
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| author | Hugo G. Nami Paloma de la Peña Carlos A. Vásquez James Feathers Sarah Wurz |
| author_facet | Hugo G. Nami Paloma de la Peña Carlos A. Vásquez James Feathers Sarah Wurz |
| author_sort | Hugo G. Nami |
| collection | DOAJ |
| description | Palaeomagnetic data from Klasies River main site Cave 1 (Eastern Cape Province, South Africa) are reported. Natural remanent magnetisation directions obtained from 77 oriented samples were determined by progressive alternating field demagnetisation methodology. Three palaeomagnetic samplings from the Witness Baulk from the Middle Stone Age (MSA) Late Pleistocene White Sand member and the Holocene Later Stone Age (LSA) middens in Cave 1 were dated and analysed to obtain the palaeomagnetic directions recorded in the sediments. Here we provide new optically stimulated luminescence (OSL) dates for the White Sand Member, and new accelerator mass spectrometry (AMS) radiocarbon dates for the LSA midden of areas not previously dated. The palaeomagnetic analysis took into account rock magnetism and directional analysis. The former reveals that the main magnetic carrier was magnetite; the latter shows that characteristic remanent magnetisation of normal and anomalous directions was observed in the lower portion of the White Sand Member and LSA midden. Normal directions correspond to the palaeosecular variation record for South Africa during the Late Pleistocene. On the other hand, the anomalous directions recorded in the LSA midden might represent the likely Sterno-Etrussia geomagnetic field excursion which occurred during the Late Holocene and is observed in other places on the planet. Finally, the directional data obtained are a potential tool for discussing the age of deposits corresponding to those periods.
Significance:
• New dates confirm and extend previous age determinations for the LSA and White Sand Member from Klasies River |
| first_indexed | 2024-12-19T03:00:10Z |
| format | Article |
| id | doaj.art-60b215231d0b4d9c9a9b3f8a6ec9b08e |
| institution | Directory Open Access Journal |
| issn | 1996-7489 |
| language | English |
| last_indexed | 2024-12-19T03:00:10Z |
| publishDate | 2016-11-01 |
| publisher | Academy of Science of South Africa |
| record_format | Article |
| series | South African Journal of Science |
| spelling | doaj.art-60b215231d0b4d9c9a9b3f8a6ec9b08e2022-12-21T20:38:13ZengAcademy of Science of South AfricaSouth African Journal of Science1996-74892016-11-0111211/12121210.17159/sajs.2016/201600513680Palaeomagnetic results and new dates of sedimentary deposits from Klasies River Cave 1, South AfricaHugo G. Nami0Paloma de la Peña1Carlos A. Vásquez2James Feathers3Sarah Wurz41 CONICET-IGEBA, ‘Daniel A. Valencio’ Palaeomagnetism Laboratory, Department of Geological Sciences, University of Buenos Aires, Buenos Aires, Argentina 2 Department of Anthropology, National Museum of Natural History, Smithsonian Institution, Washington DC, Washington, USA1 Evolutionary Studies Institute, School of Geosciences, University of the Witwatersrand, Johannesburg, South Africa 2 School of Geography, Archaeology and Environmental Sciences, University of the Witwatersrand, Johannesburg, South Africa1 CONICET-IGEBA, ‘Daniel A. Valencio’ Palaeomagnetism Laboratory, Department of Geological Sciences, University of Buenos Aires, Buenos Aires, Argentina 2 Ciclo Básico Común, University of Buenos Aires, Buenos Aires, ArgentinaLuminescence Laboratory, University of Washington, Seattle, Washington, USA1 Evolutionary Studies Institute, School of Geosciences, University of the Witwatersrand, Johannesburg, South Africa 2 School of Geography, Archaeology and Environmental Sciences, University of the Witwatersrand, Johannesburg, South AfricaPalaeomagnetic data from Klasies River main site Cave 1 (Eastern Cape Province, South Africa) are reported. Natural remanent magnetisation directions obtained from 77 oriented samples were determined by progressive alternating field demagnetisation methodology. Three palaeomagnetic samplings from the Witness Baulk from the Middle Stone Age (MSA) Late Pleistocene White Sand member and the Holocene Later Stone Age (LSA) middens in Cave 1 were dated and analysed to obtain the palaeomagnetic directions recorded in the sediments. Here we provide new optically stimulated luminescence (OSL) dates for the White Sand Member, and new accelerator mass spectrometry (AMS) radiocarbon dates for the LSA midden of areas not previously dated. The palaeomagnetic analysis took into account rock magnetism and directional analysis. The former reveals that the main magnetic carrier was magnetite; the latter shows that characteristic remanent magnetisation of normal and anomalous directions was observed in the lower portion of the White Sand Member and LSA midden. Normal directions correspond to the palaeosecular variation record for South Africa during the Late Pleistocene. On the other hand, the anomalous directions recorded in the LSA midden might represent the likely Sterno-Etrussia geomagnetic field excursion which occurred during the Late Holocene and is observed in other places on the planet. Finally, the directional data obtained are a potential tool for discussing the age of deposits corresponding to those periods. Significance: • New dates confirm and extend previous age determinations for the LSA and White Sand Member from Klasies Riverhttps://www.sajs.co.za/article/view/3680Klasies River main sitepalaeomagnetismpalaeosecular variationLate PleistoceneHolocene |
| spellingShingle | Hugo G. Nami Paloma de la Peña Carlos A. Vásquez James Feathers Sarah Wurz Palaeomagnetic results and new dates of sedimentary deposits from Klasies River Cave 1, South Africa South African Journal of Science Klasies River main site palaeomagnetism palaeosecular variation Late Pleistocene Holocene |
| title | Palaeomagnetic results and new dates of sedimentary deposits from Klasies River Cave 1, South Africa |
| title_full | Palaeomagnetic results and new dates of sedimentary deposits from Klasies River Cave 1, South Africa |
| title_fullStr | Palaeomagnetic results and new dates of sedimentary deposits from Klasies River Cave 1, South Africa |
| title_full_unstemmed | Palaeomagnetic results and new dates of sedimentary deposits from Klasies River Cave 1, South Africa |
| title_short | Palaeomagnetic results and new dates of sedimentary deposits from Klasies River Cave 1, South Africa |
| title_sort | palaeomagnetic results and new dates of sedimentary deposits from klasies river cave 1 south africa |
| topic | Klasies River main site palaeomagnetism palaeosecular variation Late Pleistocene Holocene |
| url | https://www.sajs.co.za/article/view/3680 |
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