On the estimation of lunar paleointensities - studies of synthetic analogues of stably magnetized samples.
The magnetic behavior of synthetic analogs of the carriers of the natural remanent magnetization in stably magnetized lunar samples is studied in order to evaluate standard methods for the determination of paleomagnetization. Synthetic analogs of the iron bearing troilite phases associated with mare basalts that are stable to alternating field demagnetization were prepared by heating mixtures of iron and sulfur for 24 hours at 850 C and cooling them to achieve known levels of thermoremanent magnetization. Intensity determinations by the Koenigsberger-Thellier-Thellier (KTT) method result in an underestimation of thermoremanent magnetization acquired at intermediate temperatures, and an anomalous overestimation of the partial thermoremanent magnetization acquired in each temperature increment, which is interpreted in terms of interactions in multidomain material and magnetic viscosity at high temperature. A continuous version of the KTT method with observations made at high temperatures provides improved estimates of magnetic intensities.
Lunar and Planetary Science Conference Proceedings
- Pub Date:
- Lunar Composition;
- Magnetic Flux;
- Flux Density;
- Lunar Rocks;
- Temperature Effects;
- MAGNETIC PROPERTIES;
- NATURAL REMANENT MAGNETIZATION;
- Lunar and Planetary Exploration; Moon;