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000189442 1001_ $$0P:(DE-HGF)0$$aAlmeida, Trevor P.$$b0$$eCorresponding Author
000189442 245__ $$aMagnetic characterization of synthetic titanomagnetites: Quantifying the recording fidelity of ideal synthetic analogs
000189442 260__ $$aHoboken, NJ$$bWiley$$c2014
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000189442 520__ $$aA series of four synthetic basalts comprising titanomagnetite (Fe3-xTixO4) grains of varied size and titanium content have been produced by a glass-ceramic method. Complementary characterization techniques of X-ray diffractometry, secondary electron microscopy, and transmission electron microscopy (TEM) demonstrate the reaction product composition consisted of mainly Fe3-xTixO4, pyroxene hedenbergite, fayalite, and SiO2. The samples exhibit bimodal distributions of larger (<2 µm) and smaller Fe3-xTixO4 particles (<50 nm in diameter), the latter found inside pyroxene crystals, as well as the sporadic occurance of dendritic Fe3-xTixO4 structures. Magnetic measurements show their bulk characteristics fall into two groups: Ti-rich titanomagnetite samples with varying Ti content; and near-stoichiometric magnetite. The TEM technique of off-axis electron holography allowed for visualization of the magnetic behavior of the synthetic Fe3-xTixO4 grains. Energy dispersive X-ray analysis and off-axis electron holography confirmed the small Fe3-xTixO4 grains (<50 nm) confined within glassy pyroxene regions to be Fe-rich and single domain, carrying strong magnetic signals, compared to the relatively magnetically weak larger Fe3-xTixO4 grains (x ∼ 0.6). The large grains in the pure magnetite sample are shown to be pseudo-single domain in nature. The quenching process involved in synthesis is considered similar to that of pillow basalts found at mid-ocean ridges and hence the reaction products are thought ideal in terms of characterization and understanding, for the purpose of studying natural systems.
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000189442 7001_ $$0P:(DE-HGF)0$$aMuxworthy, Adrian R.$$b1
000189442 7001_ $$0P:(DE-HGF)0$$aWilliams, Wyn$$b2
000189442 7001_ $$0P:(DE-HGF)0$$aKasama, Takeshi$$b3
000189442 7001_ $$0P:(DE-Juel1)144121$$aDunin-Borkowski, Rafal$$b4$$ufzj
000189442 773__ $$0PERI:(DE-600)2027201-7$$a10.1002/2013GC005047$$gVol. 15, no. 1, p. 161 - 175$$n1$$p161 - 175$$tGeochemistry, geophysics, geosystems$$v15$$x1525-2027$$y2014
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000189442 9141_ $$y2014
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