Magnetization of Ocean Basalts

Wasilewski, P. J.

doi:10.5636/jgg.20.129

Cited by 24 publications

(14 citation statements)

References 57 publications

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“…X-ray analysis suggests the general equation (/9o->fL+a) (Wasilewski, 1968), where Qo is a homogeneous high titanium titanomagnetite, pL is a low titanium titanomagnetite product phase, and a a member of the ilmenite-hematite series. Whereas a fine powder produces two a phases, one of which in aFe203, a dense sintered titanomagnetite produces (FeTi)203 along with the cubic phase.…”

Section: Maghemite Curie Pointmentioning

confidence: 99%

“…lOB is mainly due to a thermal process with minor oxidation. When the above experimental factors are considered, and when reflection microscopy is used to study the polished sections of rock samples, the alteration potential can be reasonably evaluated (see, for example, Wasilewski, 1968Wasilewski, , 1969.…”

Section: Sample Preparationmentioning

confidence: 99%

“…The coarse fragments used for (a) were crushed to fine powder and the powder analyzed; the arrows indicate direction of heating; after heating to 6000C and cooling to 4750C the sample was heated to 6750C and returned to room temperature to 4500C (see Kobayashi, 1959;Wasilewski 1968). Shown in Fig.…”

Section: Maghemite Curie Pointmentioning

confidence: 99%

“…Each separate experiment demonstrates some aspect of irreversible behavior. Synthetic equivalents of the natural specimens in a qualitative sense exhibit an identical behavior (Wasilewski, 1968 If x=1.0 (Fe2TiO4), numerous phases cas result on alteration:…”

Section: Introductionmentioning

confidence: 99%

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Thermomagnetic Analysis: Experimental Factors

Wasilewski¹

1969

J. geomagn. geoelec

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Section: Maghemite Curie Pointmentioning

confidence: 99%

Section: Sample Preparationmentioning

confidence: 99%

Section: Maghemite Curie Pointmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thermomagnetic Analysis: Experimental Factors

Wasilewski¹

1969

J. geomagn. geoelec

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“…Ade Hall (1963) suggested that TCRM might be responsible for the anomalous increase in saturation magnetization (js) and Curie point (Ta) observed in some oceanic basalts. Recently, Wasilewski (1968) demonstrated that the TCRM process is responsible for the magnetization behavior noted in certain oceanic and continental basalts and in synthetic titanomagnetites. There have been a number of extensive experimental studies on rocks which exhibit TCRM behavior (Bewersdorff,1961;Meitzner,1963;Petersen,1967;Ozima, et at., 1938;and Wasilewski,1968).…”

Section: Introductionmentioning

confidence: 99%

Thermochemical Remanent Magnetization (TCRM) in Basaltic Rocks

Wasilewski¹

1969

J. geomagn. geoelec

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Continental or oceanic basaltic rocks which contain optically homogeneous titanomagnetites are defined as magnetic class I rocks and exhibit thermochemical remanent magnetization (TCRM) behavior when heated. Heating of magnetic class I rocks results in an increase in:(a) Curie point (Ta) (b) susceptibility (X) (c) coercive force (HI) (d) remanent magnetization (Jr) (e) demagnetization stability (f) saturation magnetization (Js). Though the titanomagnetites are optically homogeneous, they are chemically heterogeneous, and may contain textures which cannot be optically resolved. The extent of optically unresolved textures and degree of chemical heterogeneity will depend on the previous history of the sample. The development of iron-oxide textures and correlative magnetization behavior can be understood through experimental studies of magnetic class I rocks. The magnetic characteristics of rocks which exhibit the TCRM behavior are presented and discussed. Three processes can be operative in the development of TCRM in basaltic rocks :(a) thermal process (b) thermochemical process (c) oxidation process.

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