Low-temperature demagnetization of volcanic rocks containing multi-domain magnetic grains: Implications for the Thellier paleointensity determination
Thirteen samples of volcanic rocks from Caucasus, Iceland and Philippines were subjected to low-temperature treatment in order to remove the part of remanent magnetization carried by multi-domain grains. Ten to 40% of multi-domain partial thermoremanence were removed, which may help to increase the...
| Main Authors: | , , , |
|---|---|
| Format: | Article in Journal/Newspaper |
| Language: | English Spanish |
| Published: |
Universidad Nacional Autónoma de México, Instituto de Geofísica
2001
|
| Subjects: | |
| Online Access: | https://doaj.org/article/9251960b26cb4047a597112ef40be8ab |
| Summary: | Thirteen samples of volcanic rocks from Caucasus, Iceland and Philippines were subjected to low-temperature treatment in order to remove the part of remanent magnetization carried by multi-domain grains. Ten to 40% of multi-domain partial thermoremanence were removed, which may help to increase the success of paleointensity experiments. A sample from the 1991 eruption of Pinatubo volcano shows a total self-reversal due to ilmeno-hematites and partial self-reversal between 500° and 575 °C due to titano-magnetites. Low temperature demagnetization applied to self-reversed remanence suggest that the high-temperature peak is almost suppressed by this treatment. |
|---|