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Étude du paléomagnétisme du site de l'homme de Yunxian

Abstract : The magnetostratigraphic analysis of the Pleistocene formations of the Yunxian Man site, left side of the Han river, shoxs two major changes in the geomagnetic polarity. The fluvial deposits, installed by high energy currents, consisting in gravels in a large sandy matrix in alternance with banks of sand, and presenting a positive geomagnetic polarity, correspon to Jaramillo event. The top of thes fluvial gravels and the sandy-clayey silts that are lying above them, in wich several archaeological levels and the two Homo erectus skulls Yunxian I and Yunxian II were discovered, have a negative geomagnetic polarity and correspond to upper skulls, could correspond to the excursion of Kamikatsura (about 899 000 years ago) or to the excursion of Santa Rosa (about 936 000 years ago). The upper part of the flood silts, back to a positive geomagnetic polarity, correspond to Brunhes period. The flood silt-sand-clay deposits, in which the two Homo erectus skulls were discovered, belonging to upper Matuyama period are therefore dated of 984 000 to 780 000 years. Actually, the small positive excursion found in the carbonated sediments in wich the two Homo erectus skull were discovered, Yunxian I and Yunxian II, pernits a more precise datation, as it correponds to the Santa Rosa excursion ( about 936 000 years ago). These results are consistent with the archaeological, paleoanthropological and biostratigraphical datas, and do not contradict the result of the ESR datations.
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https://hal.archives-ouvertes.fr/hal-00472885
Contributor : Bertrand Lecervoisier Connect in order to contact the contributor
Submitted on : Tuesday, April 13, 2010 - 3:05:08 PM
Last modification on : Thursday, July 7, 2022 - 5:57:11 AM

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Henry de Lumley, Samir Khatib, Brahim Mestour, Jérôme Gattacceca, Olivier Faure, et al.. Étude du paléomagnétisme du site de l'homme de Yunxian. Le site de l'homme de Yunxian, Quyuanhekou, Quingqu, Yunxian, province du Hubei, CNRS ÉDITIONS, 589 p., 2008. ⟨hal-00472885⟩

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