Assessing the timing of greigite formation and the reliability of the Upper Olduvai polarity transition record from the Crostolo River, Italy

Andrew Roberts (1) , Wei‐teh Jiang (2) , Fabio Florindo (3) , Chorng-Shern Horng (4) , Carlo Laj (5, 6)

1 NOC - National Oceanography Centre [Southampton]
2 NCKU - National Cheng Kung University
3 INGV - Istituto Nazionale di Geofisica e Vulcanologia - Sezione di Roma
4 IES Sinica - Institute of Earth Sciences [Tapei]
5 LSCE - Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette]
6 CLIMAG - Climat et Magnétisme

The Crostolo River section in Italy yielded a detailed record of the Upper Olduvai geomagnetic polarity transition that has been used to support the hypothesis of deep mantle control on the transitional geomagnetic field. The paleomagnetic record is carried by the authigenic iron sulphide, greigite, which was interpreted to have formed shortly after deposition. Our detailed scanning electron microscope investigations indicate the presence of at least 3 generations of pyrite, which usually forms with greigite as a precursor. This suggests that the total magnetization is a complex composite that produced a smoothed record of transitional field behaviour.

Domaines: Géophysique [physics.geo-ph]

Andrew Roberts, Wei‐teh Jiang, Fabio Florindo, Chorng-Shern Horng, Carlo Laj. Assessing the timing of greigite formation and the reliability of the Upper Olduvai polarity transition record from the Crostolo River, Italy. Geophysical Research Letters, 2005, 32 (5), pp.L05307. ⟨10.1029/2004GL022137⟩. ⟨hal-03118267⟩