U-Th dated speleothem recorded geomagnetic excursions in the Lower Brunhes.

Abstract:

: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.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Pozzi JP,Rousseau L,Falguères C,Mahieux G,Deschamps P,Shao Q,Kachi D,Bahain JJ,Tozzi C

doi

10.1038/s41598-018-38350-4

subject

Has Abstract

pub_date

2019-02-04 00:00:00

pages

1114

issue

1

issn

2045-2322

pii

10.1038/s41598-018-38350-4

journal_volume

9

pub_type

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