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To evaluate the effect of undersaturation of magnetic hysteresis loops measured in moderate (<2 T) fields in magnetically hard minerals such as goethite or hematite, we measured room temperature hysteresis loops in a 7 T field and DC backfield demagnetization curves in fields up to 3 T using an MPMS 3 instrument. Sediments from different regions of the East European platform, mostly of Carboniferous age were used for this study. Similar experiments were also carried out for a small collection of archaeological ceramics (bricks) apparently containing a High Coercivity Low unblocking Temperature (HCLT) magnetic phase (ε-Fe2O3?). Hysteresis measurements were complemented by thermomagnetic analysis at low and high temperatures, microscopic observations, and X-ray diffraction studies. High-field magnetic hysteresis loops alone appear insufficient to definitively discriminate goethite from hematite, though there is, expectedly, a tendency that increasing goethite content leads to magnetic hardening, with coercive force reaching 1 T and coercivity of remanence 1.7 T. At the same time, ε-Fe2O3 can seemingly be distinguished from either hematite or goethite due to its high saturation magnetization. However, combining hysteresis measurements with low- and high-temperature thermomagnetic analysis provides a much better insight into the magnetic mineralogy of samples. Still, acquiring the reference data on well characterized hematite, goethite, and ε-Fe2O3 samples is highly desirable.
Язык оригинала | английский |
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Название основной публикации | Problems of Geocosmos–2018 |
Подзаголовок основной публикации | Proceedings of the XII International Conference and School |
Редакторы | Tatiana Yanovskaya, Andrei Kosterov, Nikita Bobrov, Andrey Divin, Alexander Saraev, Nadezhda Zolotova |
Место публикации | Cham |
Издатель | Springer Nature |
Страницы | 127-142 |
Число страниц | 16 |
ISBN (электронное издание) | 978-3-030-21788-4 |
ISBN (печатное издание) | 978-3-030-21787-7 |
DOI | |
Состояние | Опубликовано - 2020 |
Название | Springer Proceedings in Earth and Environmental Sciences |
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ISSN (печатное издание) | 2524-342X |
ISSN (электронное издание) | 2524-3438 |
ID: 46104229