Field-dependence of AC susceptibility in titanomagnetites
Earth and Planetary Science Letters
By: M. Jackson, B. Moskowitz, J. Rosenbaum, and Catherie Kissel
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Abstract
AC susceptibility measurements as a function of field amplitude Hac and of frequency show a strong field dependence for a set of synthetic titanomagnetites (Fe3-xTixO4) and for certain basalts from the SOH-1 Hawaiian drill hole and from Iceland. In-phase susceptibility is constant below fields of about 10-100 A/m, and then increases by as much as a factor of two as Hsc is increased to 2000 A/m. Both the initial field-independent susceptibilities and field-dependence of susceptibility are systematically related to composition: initial susceptibility is 3 SI for a single-crystal sphere of TMO (x = 0) and decreases with increasing titanium content; field-dependence is nearly zero for TM0 and increases systematically to a maximum near TM60 (x = 0.6). This field dependence can in some cases be mistaken for frequency dependence, and leaf to incorrect interpretations of magnetic grain size and composition when titanomagnetite is present.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Field-dependence of AC susceptibility in titanomagnetites |
| Series title | Earth and Planetary Science Letters |
| DOI | 10.1016/S0012-821X(98)00032-6 |
| Volume | 157 |
| Issue | 3-4 |
| Year Published | 1998 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Earth and Planetary Science Letters |
| First page | 129 |
| Last page | 139 |
| Google Analytic Metrics | Metrics page |