| 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. |
| Genre: | Article |
| ProdID: | 70021113 |
| Citation Author: | Jackson, M.; Moskowitz, B.; Rosenbaum, J.; Kissel, C. |
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| Citation End Page: | 139 |
| Citation Issue: | 3-4 |
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| Citation Language: | English |
| Citation Larger Work Title: | Earth and Planetary Science Letters |
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| Citation Number Of Pages: | 11 |
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| Citation Search Results Text: | Field-dependence of AC susceptibility in titanomagnetites; 1998; Article; Journal; Earth and Planetary Science Letters; Jackson, M.; Moskowitz, B.; Rosenbaum, J.; Kissel, C. |
| Citation Start Page: | 129 |
| Citation Volume: | 157 |
| Citation Year: | 1998 |
| Type: | citation/reference |
| Text: | Field-dependence of AC susceptibility in titanomagnetites; 1998; Article; Journal; Earth and Planetary Science Letters; Jackson, M.; Moskowitz, B.; Rosenbaum, J.; Kissel, C. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1016/S0012-821X(98)00032-6 |
| Date Other: | Thu, 1 Jan 1998 00:00 -0600 |
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