热退磁现象是因为对金属进行着磁后，由于环境或周围温度升高时造成金属磁量减少的现象。一般首先对着磁资材进行检讨后在进行使用，以便在完成品制作成后因运输等原因造成温升过高磁量减少从而着磁不良。
通过等温剩磁和三轴热退磁实验确定了样品中的主要载磁矿物为赤铁矿。
We find that hematite is the main magnetic carrier mineral according to isothermal remanent magnetization acquisition and demagnetization of three orthogonal isothermal remanent magnetization.
用热退磁和交变场退磁方法对59个采点的619块样品做了磁清洗处理。
We have carried out magnetic cleaning for 619 specimens from 59 sites by A. F and thermal demagnetization.
热退磁处理可有效分离次生粘滞剩磁(低温分量)和原生剩磁(高温分量)。
Secondary viscous remanence (low-temperature component) and primary remanence (high-temperature component) can be effectively separated by thermal-demagnetizing process.
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