Open AccessThe Variation of Magnetic Properties among Red Sandstones
Author(s) -
Collinson D. W.
Publication year - 1967
Publication title -
geophysical journal of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0016-8009
DOI - 10.1111/j.1365-246x.1967.tb03115.x
Subject(s) - ferrous , remanence , rock magnetism , geology , mineralogy , mineral , ferric iron , isothermal process , natural remanent magnetization , magnetization , ferric , geochemistry , materials science , magnetic field , metallurgy , thermodynamics , physics , quantum mechanics
Summary Magnetic properties of samples from thirteen formations of red sandstones have been measured, together with their ferrous and ferric iron and titanium content. Initial susceptibility, induced magnetization and isothermal remanent magnetization per unit mass of rock correlate generally with ferric iron content; the magnitude of these properties per unit mass of contained ferric oxide often show considerable scatter, however, both within one formation and in the mean values for each formation. This scatter is believed to be due to varying proportions of pigment and specularite in the rocks and to the presence of a mineral containing ferrous iron, tentatively identified as a titanohaematite. The palaeomagnetic characteristics of the sandstones, such as magnetic stability or instability and the existence of reversals, do not appear to be reflected in the magnetic properties of the contained minerals.