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Authors: Roberts, A. P.* 
Jiang, W.-T.* 
Florindo, F.* 
Horng, C.-S.* 
Laj, C.* 
Title: Assessing the timing of greigite formation and the reliability of the Upper Olduvai polarity transition record from the Crostolo River, Italy
Issue Date: 2005
Series/Report no.: / 32 (2005)
DOI: 10.1029/2004GL022137
Keywords: greigite
Upper Olduvai polarity transition
Crostolo river
Subject Classification04. Solid Earth::04.05. Geomagnetism::04.05.02. Geomagnetic field variations and reversals 
04. Solid Earth::04.05. Geomagnetism::04.05.06. Paleomagnetism 
04. Solid Earth::04.05. Geomagnetism::04.05.07. Rock magnetism 
Abstract: 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.
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