Premium
Rock magnetism of Lower/Middle Pleistocene marine sediments, Wanganui Basin, New Zealand
Author(s) -
Roberts Andrew P.,
Phillans Brad J.
Publication year - 1993
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/93gl00802
Subject(s) - rock magnetism , geology , remanence , magnetic mineralogy , pleistocene , paleomagnetism , geochemistry , demagnetizing field , ferrimagnetism , mineralogy , paleontology , magnetization , physics , quantum mechanics , magnetic field
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.