Abstract
The paper features data on thermomagnetic characteristics of the red-bed sediments of the Lower Cretaceous of the Tadjik depression which turned out to be somewhat anomalous. The thermomagnetic characteristics of monolithic samples are stable under long-term heating (2–3 hours) at high temperature (600°–700°C). At the same time, the thermomagnetic characteristics of the powders, obtained from heated monolithic samples, display instability under even lesser temperatures.
During heating at 600°–700°C, part of the hematite, dispersed in the rock, turns into stable maghemite. Disintegration of the monoliths changes the properties of the secondary maghemite - it becomes unstable to heating and at temperatures of 550°-600°C irreversibly changes into hematite.
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References
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Rzhevski, Y.S. Anomalies of Thermomagnetic Characteristics of Lower Cretaceous Red-Beds in the Tadjik Depression (Southern Tien-Shan). Studia Geophysica et Geodaetica 41, 164–170 (1997). https://doi.org/10.1023/A:1023336612145
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DOI: https://doi.org/10.1023/A:1023336612145