Determination of domain structure in igneous rocks by alternating field and other methods

Details Determination of domain structure in igneous rocks by alternating field and other methods Determination of domain structure in igneous rocks by alternating field and other methods

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983e%26psl..63..353d&link_type=abstract

Earth and Planetary Science Letters, Volume 63, Issue 3, p. 353-367.

Computer Science

51

Scientific paper

AF (alternating field) demagnetization, ARM (anhysteretic remanent magnetization) and strong-field hysteresis properties of a large collection of mostly continental igneous rocks are reported here. The collection included rocks whose magnetic carriers were believed from previous work to be of one of three types: MD (multidomain); SD/PSD (single-domain/pseudo-single-domain); or a bimodal mixture of MD grains (e.g., discrete opaques) and SD/PSD material (e.g., silicate inclusions). Two series of subaerial basalts with a full range of deuteric oxidation classes included examples of all three classes of behaviour. SD/PSD rocks have relatively hard inflected AF decay curves (decay rate initially increasing, then decreasing), MD rocks have soft, exponential-like decay curves, and bimodal rocks have a combination of these characteristics. Relative hardnesses of normalized decay curves of remanences acquired in weak, intermediate and strong fields (the Lowrie-Fuller test) are also distinctively different for the three classes, and the results support the theory developed in an accompanying paper [1] that Lowrie-Fuller characteristics are an expression of the shapes of decay curves. The Lowrie-Fuller test, although its result can be expressed as a numerical parameter, is not capable of fine-scale classification of domain structure or grain size. The shape of the ARM induction curve does have a quasi-continuous variation with grain size, however. The parameter χar/Jrs (initial anhysteretic susceptibility normalized to saturation remanence), which is easily measured with standard paleomagnetic instrumentation, is potentially useful for magnetic granulometry, although χar itself was not diagnostic of grain size.

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