Experimental study of chemical and crystallization remanent magnetizations in magnetite

Physics

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Crystallization magnetization (KRM) of magnetite is experimentally studied by the oxidation of fine grains of pyrite and by the oxidation (unmixing) of titanomagnetite with Tc = 150-200°C at the temperature of 400-450°C in the magnetic field of 50-100 mkT. Chemical remanence (CRM) of magnetite, which forms by the unmixing of titanomaghemite with Tc = 380-450°C at the temperature of 350°C in a magnetic field, is investigated. The main properties of KRM and CRM are:
(1) the relation of KRM/ARMt = 1.0-1.4 and CRM/ARM1 = 0.7-0.9, where ARMt is anhysteretic remanent magnetization after thermal demagnetization to the temperature of KRM or CRM acquisition;
(2) the relative distance NT between linear portions of coercive force spectra of normal remanence from KRM or CRM state and from zero state is less than 0.2; for the same samples when absolute zero state and zero state are comparing NT >= 0.3 (Sholpo-Luzianina NT-test of TRM); and
(3) the spontaneous growth of KRM is small, but the spontaneous growth of CRM is not less than that of ARM or TRM.
The properties of artificial KRM and CRM are similar to the properties of some rocks with natural KRM and CRM. As CRM/ARMt and KRM/ARMt ratio varies in the narrow limit, it can be used for the palaeointensity estimation. The first palaeointensity results are demonstrated: Holocene deep sea nodules-51 +/- 4 mkT, Palaeocene magnetite ore -47 +/- 3 mkT and Devonian baked rocks-6.1 +/- 2.1 mkT.

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