1979
DOI: 10.1139/e79-035
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The identification of single-domain titanomagnetite particles by means of transmission electron microscopy

Abstract: A basalt sample dredged from the axis of the Mid-Atlantic Ridge has been ion-thinned and examined by transmission electron microscopy. Finely dispersed particles as small as 0.04 μm in diameter, occurring in amorphous patches of the rock, have been identified as titanomagnetite by means of electron diffraction and microanalysis. These small particles have dimensions appropriate to single magnetic domain behaviour, and are considered to be largely responsible for the strong and very stable natural remanent magn… Show more

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Cited by 36 publications
(17 citation statements)
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“…Similar features have frequently been found in extraterrestrial (e.g., Muller, 1978;Barber et al, 1984) as well as in terrestrial spinels of a considerable variety of composition (e.g., Smith, 1979Smith, , 1980Price, 1979Price, , 1980Putnis and Price, 1980). Although it seems possible that this mottled texture could be a result of the thinning process (Smith, 1980), Putnis and Price (1980) argue on the basis of a fractured specimen showing the same features that the contrast is mostly attributed to point defect clusters.…”
Section: Spinelsupporting
confidence: 73%
“…Similar features have frequently been found in extraterrestrial (e.g., Muller, 1978;Barber et al, 1984) as well as in terrestrial spinels of a considerable variety of composition (e.g., Smith, 1979Smith, , 1980Price, 1979Price, , 1980Putnis and Price, 1980). Although it seems possible that this mottled texture could be a result of the thinning process (Smith, 1980), Putnis and Price (1980) argue on the basis of a fractured specimen showing the same features that the contrast is mostly attributed to point defect clusters.…”
Section: Spinelsupporting
confidence: 73%
“…But, Ti-free maghemite has a Curie temperature of 645°C (Ozdemir & Banerjee 1984;Ozdemir 1990) and shows a non-reversible thermomagnetic behaviour, neither of which were observed during our Curie temperature experiments. The occurrence of spherical magnetite in glassy parts of mid-ocean ridge basalt (MORB) has been reported previously by Smith (1979). He found numerous small particles in the interstitial glass groundmass which were equidimensional with sizes between 30 and 100nm and he classified them as single-domain.…”
Section: Preliminary Results From Tem Analysismentioning
confidence: 55%
“…Scanning (SEM) and transmission (TEM) electron microscopic studies, e.g., by Smith [1979], Freeman [1986], Petersen et al [1986], Petersen and Vali [1987], Vali et al [1989], Roberts [1995], Hounslow and Maher [1996], and Rey et al…”
Section: Introductionmentioning
confidence: 99%