Titlebook: Methods in Rock Magnetism and Palaeomagnetism; Techniques and instr D. W. Collinson Book 1983 D. W. Collinson 1983 magnetism

amyloid

Presentation and treatment of data, After magnetic cleaning a well-defined mean primary NRM direction ideally remains which, with other site means from the same rock unit, can be interpreted through an overall formation mean direction in terms of polar wandering and/or plate movements.

BARGE

Identification of magnetic minerals and carriers of NRM,gnificance of the NRM and of the rock’s magnetization history. If several magnetic minerals are present, only one of which is carrying a primary NRM, experiments designed to identify the latter should clearly involve the remanent magnetism only and not other properties, e.g. induced magnetization, to which all magnetic minerals present contribute.

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周兴旺

木质

dainty

Magnetic cleaning techniques,The foregoing field and laboratory tests are at best evidence for secondary NRM acquisition since some geological event or for the presence of low-coercivity material, and the more positive demagnetization (or ‘cleaning’) techniques which detect and remove secondary magnetizations are now a routine part of palaeomagnetic measurements.

GEST

Rock magnetism and magnetic minerals,nd magnetic minerals can acquire. Although all minerals possess some magnetic properties, even if only paramagnetic or diamagnetic, the term ‘magnetic minerals’ is used here only for those minerals which are capable of carrying remanent magnetism.

Entirety

Initial magnetic susceptibility, m. kg .. In this chapter we are initially concerned with isotropic susceptibility, i.e. susceptibility that is independent of the axis along which it is measured in a material and .. and . are parallel.

Postulate

High- and low-temperature measurements,etism of paramagnetic, superparamagnetic and ferromagnetic minerals has distinctive thermal characteristics depending, for instance, on grain size, and in ferromagnetics on the existence of single and multidomain grains.

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