%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Pozzi, J. P.
%A Rousseau, L.
%A Falgueres, C.
%A Mahieux, G.
%A Deschamps, Pierre
%A Shao, Q. F.
%A Kachi, D.
%A Bahain, J. J.
%A Tozzi, C.
%T U-Th dated speleothem recorded geomagnetic excursions in the Lower Brunhes
%D 2019
%L fdi:010075162
%G ENG
%J Scientific Reports - Nature
%@ 2045-2322
%K ITALIE
%M ISI:000457616300003
%P art. 1114 [8 ]
%R 10.1038/s41598-018-38350-4
%U https://www.documentation.ird.fr/hor/fdi:010075162
%> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers19-02/010075162.pdf
%V 9
%W Horizon (IRD)
%X The study of geomagnetic excursions is key for understanding the behavior of the magnetic field of the Earth. In this paper, we present the geomagnetic record in a 2.29-m-long continuous core sampled in a flowstone in Liguria (Italy) and dated to the Lower Brunhes. The cored flowstone developed from Marine Isotopic Stage (MIS) 13 to MIS 7, according to 21 U-series dates. The mean growth rate is closely related to glacial and interglacial isotopic stages. Magnetic remanence was measured using u-channel and deconvolved. Four geomagnetic excursions were recorded at the same location, in a single flowstone, during interglacial MIS 11 and 13; Basura 1, 2, 3 and 4, at depths of 213 cm, 181, 160 and 92 cm, respectively. Due to the uncertainties of U-Th dating, the timing of the three events, namely Basura 1, 2 and 3 overlaps. The Basura 4 is well-dated to 417 + -7/8 ka and is clearly distinguishable from the others. It should therefore be considered as a possible excursion.
%$ 066 ; 064