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

Andrew P. Roberts; Wei Teh Jiang; Fabio Florindo; Chorng Shern Horng; Carlo Laj

doi:10.1029/2004GL022137

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

Andrew P. Roberts, Wei Teh Jiang, Fabio Florindo, Chorng Shern Horng, Carlo Laj

Department of Earth Sciences

Research output: Contribution to journal › Article › peer-review

35 Citations (Scopus)

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.

Original language	English
Pages (from-to)	1-4
Number of pages	4
Journal	Geophysical Research Letters
Volume	32
Issue number	5
DOIs	https://doi.org/10.1029/2004GL022137
Publication status	Published - 2005 Mar 16

All Science Journal Classification (ASJC) codes

Geophysics
Earth and Planetary Sciences(all)

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AU - Horng, Chorng Shern

AU - Laj, Carlo

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

Abstract

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