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024 7 _ |a 10.1002/2013GC005047
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100 1 _ |a Almeida, Trevor P.
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245 _ _ |a Magnetic characterization of synthetic titanomagnetites: Quantifying the recording fidelity of ideal synthetic analogs
260 _ _ |a Hoboken, NJ
|c 2014
|b Wiley
336 7 _ |a Journal Article
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520 _ _ |a A 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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700 1 _ |a Muxworthy, Adrian R.
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700 1 _ |a Williams, Wyn
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700 1 _ |a Kasama, Takeshi
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700 1 _ |a Dunin-Borkowski, Rafal
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773 _ _ |a 10.1002/2013GC005047
|g Vol. 15, no. 1, p. 161 - 175
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|t Geochemistry, geophysics, geosystems
|v 15
|y 2014
|x 1525-2027
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