Mathematics – Logic
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja....10755n&link_type=abstract
EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #10755
Mathematics
Logic
Scientific paper
Very small single-domain (SD) grains with magnetization energy barriers comparable to their thermal energy [Neel, 1949] and hence unable to retain a remanence at a specific temperature are called "superparamagnetic" (SP) [Bean and Livingston, 1959]. Their magnetic moment follows Langevin paramagnetic behavior with changing temperature and magnetic field strength. These chemically stable magnetic particles have been observed in different natural magnetic materials: rocks, soils, lake and marine sediments, meteorites. Their size, composition and shape may provide information about the natural formation processes, such as the dynamics of igneous rocks crystallization, chemical and biological production and dissolution of magnetic particles in sediments and soils. It is not easy to determine the properties of SP materials, especially when SD, MD or paramagnetic minerals are present in the same samples. All methods proposed to measure SP properties are based on the time-dependence of the SP magnetic moment [e.g., Maher, 1986; Heller et al., 1991; Worm, 1998; Hunt and Banerjee, 1992; Worm, 1999; Smirnov and Tarduno, 2001]. Their application may be hampered by low concentration of the SP component, narrow limits of the experimental time, strong influence of other magnetic fractions. Some of these methods are not useful for rapidly measuring a large number of samples. The "coercivity spectrometer" developed by Burov et al. [1986] and modernized by Iassonov et al. [1998] overcomes several of these limitations. It uses principles that provide easy and extremely quick measurement of SP component properties in weakly magnetic natural materials at room temperature. The full SP magnetic signal can be studied within a split second after high field magnetization (IRM) has been imprinted. In this way, paramagnetic and induced magnetizations of SD and MD grains can be excluded, but the magnetic signal arising from the SP component is saved at the same time. In this paper we will present magnetization curves of SP mineral fractions observed in different types of natural materials (recent lake and loess sediments, soils meteorites, kimberlites).
Heller Friedrich
Iassonov Pavel G.
Nourgaliev Danis K.
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