Thermally induced inversion of Al-substituted titanomagnetite in basalts: evidence for partial self-reversal
Pan, Y-X., Liu, Q-S., Deng, C-L., Qin, H-F. and Zhu, R-X. (2006) Thermally induced inversion of Al-substituted titanomagnetite in basalts: evidence for partial self-reversal. Journal of Geophysical Research, 111, (B12), B12S29. (doi:10.1029/2006JB004576).
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Description/Abstract
We report properties of laboratory-induced thermoremanence combined with detailed rock magnetic experiments on basaltic samples which contain aluminum-substituted titanomagnetite (Fe2.24Ti0.64Al0.12O4). Prior to Thellier-Coe paleointensity experiments, specimens were first demagnetized using an alternating field with a peak field of 90 mT and were then imparted an anhysteretic remanent magnetization (ARM) to represent a natural remanent magnetization (NRM). Results show that the partial thermal remanent magnetization (pTRM) gain and ARM remaining are linearly correlated up to 300°C. Between 300 and 460°C, specimens acquire thermoremanence with a direction antiparallel to the external field direction, leading to intensity decreases. This coincides with the onset of the mineral transformation from Al-titanomagnetite to a magnetic phase with higher Tc. Our results support that phase interaction with distinct Tc values in partially oxidized titanomagnetite can produce partial self-reversal thermoremanence in rocks.
| Item Type: | Article |
|---|---|
| ISSNs: | 0148-0227 (print) |
| Related URLs: | |
| Keywords: | Al-substituted titanomagnetite, thermoremanence, partial self-reversal, low-temperature magnetic experiments |
| Subjects: | Q Science > QE Geology |
| Divisions: | University Structure - Pre August 2011 > School of Ocean & Earth Science (SOC/SOES) |
| Item ID: | 44105 |
| Date Deposited: | 14 Feb 2007 |
| Last Modified: | 01 Jun 2011 02:25 |
| Contributors: | Pan, Y-X. (Author) Liu, Q-S. (Author) Deng, C-L. (Author) Qin, H-F. (Author) Zhu, R-X. (Author) |
| Date: | 2006 |
| Status: | Published |
| URI: | http://eprints.soton.ac.uk/id/eprint/44105 |
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