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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

Assessing the timing of greigite formation and the reliability of the Upper Olduvai polarity transition record from the Crostolo River, Italy
Assessing the timing of greigite formation and the reliability of the Upper Olduvai polarity transition record from the Crostolo River, Italy
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.
0094-8276
L05307
Roberts, A.P.
4497b436-ef02-428d-a46e-65a22094ba52
Jiang, W.T.
dd2fbd28-0ee5-4741-9ed5-a68abc724dc9
Florindo, F.
8782f358-6dd8-4531-aaf1-4e1e859d52db
Horng, C.S.
9f88f33d-e683-4b6a-bdd0-93b3b292601f
Laj, C.
7f5fe7d9-e4f1-4f3c-b138-d381d31df532
Roberts, A.P.
4497b436-ef02-428d-a46e-65a22094ba52
Jiang, W.T.
dd2fbd28-0ee5-4741-9ed5-a68abc724dc9
Florindo, F.
8782f358-6dd8-4531-aaf1-4e1e859d52db
Horng, C.S.
9f88f33d-e683-4b6a-bdd0-93b3b292601f
Laj, C.
7f5fe7d9-e4f1-4f3c-b138-d381d31df532

Roberts, A.P., Jiang, W.T., Florindo, F., Horng, C.S. and Laj, C. (2005) Assessing the timing of greigite formation and the reliability of the Upper Olduvai polarity transition record from the Crostolo River, Italy. Geophysical Research Letters, 32 (5), L05307. (doi:10.1029/2004GL022137).

Record type: Article

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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Published date: 2005
Organisations: Ocean and Earth Science

Identifiers

Local EPrints ID: 17408
URI: https://eprints.soton.ac.uk/id/eprint/17408
ISSN: 0094-8276
PURE UUID: 3da198fa-ba07-4e07-be3a-a3df1e098e95

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Date deposited: 07 Sep 2005
Last modified: 17 Jul 2017 16:38

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