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Rock Magnetism of Lower/Middle Pleistocene Marine Sediments, Wanganui Basin, New Zealand

Rock Magnetism of Lower/Middle Pleistocene Marine Sediments, Wanganui Basin, New Zealand
Rock Magnetism of Lower/Middle Pleistocene Marine Sediments, Wanganui Basin, New Zealand
Rock magnetic studies were carried out in order to identify the remanence carrying minerals and the domain state of magnetic grains in Lower/Middle Pleistocene marine sediments from the Wanganui Basin, southwestern North Island, New Zealand. Isothermal remanent magnetization (IRM) acquisition and stepwise thermal demagnetization of a three-axis composite IRM suggest that titanomagnetite (or titanomaghaemite) is the dominant remanence carrier in these sediments. Other rock magnetic data suggest that these grains occur in a range of sizes in the superparamagnetic to pseudo-single domain range, which helps account for the wide range of observed palaeomagnetic behaviour. Isolated occurrences of ferrimagnetic iron sulphides cannot be ruled out.

0094-8276
839-842
Roberts, Andrew P.
4f062491-5408-4edb-8dd1-140c6a42e93f
Phillans, Brad J.
cbcb40ab-9a6d-4163-b752-f68f01bd7113
Roberts, Andrew P.
4f062491-5408-4edb-8dd1-140c6a42e93f
Phillans, Brad J.
cbcb40ab-9a6d-4163-b752-f68f01bd7113

Roberts, Andrew P. and Phillans, Brad J. (1993) Rock Magnetism of Lower/Middle Pleistocene Marine Sediments, Wanganui Basin, New Zealand. Geophysical Research Letters, 20 (9), 839-842.

Record type: Article

Abstract

Rock magnetic studies were carried out in order to identify the remanence carrying minerals and the domain state of magnetic grains in Lower/Middle Pleistocene marine sediments from the Wanganui Basin, southwestern North Island, New Zealand. Isothermal remanent magnetization (IRM) acquisition and stepwise thermal demagnetization of a three-axis composite IRM suggest that titanomagnetite (or titanomaghaemite) is the dominant remanence carrier in these sediments. Other rock magnetic data suggest that these grains occur in a range of sizes in the superparamagnetic to pseudo-single domain range, which helps account for the wide range of observed palaeomagnetic behaviour. Isolated occurrences of ferrimagnetic iron sulphides cannot be ruled out.

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More information

Published date: 1993
Organisations: Ocean and Earth Science

Identifiers

Local EPrints ID: 66148
URI: http://eprints.soton.ac.uk/id/eprint/66148
ISSN: 0094-8276
PURE UUID: 40f54880-fe54-46e7-9223-213d59519558

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Date deposited: 05 May 2009
Last modified: 22 Jul 2022 17:00

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Contributors

Author: Andrew P. Roberts
Author: Brad J. Phillans

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