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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
Title of journal: Geophysical Research Letters
Series/Report no.: / 32 (2005)
Publisher: AGU
Issue Date: 2005
DOI: 10.1029/2004GL022137
Keywords: greigite
Upper Olduvai polarity transition
Crostolo river
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.
Appears in Collections:04.05.07. Rock magnetism
04.05.06. Paleomagnetism
04.05.02. Geomagnetic field variations and reversals
Papers Published / Papers in press

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