Magnetic mineralogical applications of stepwise heating κ-T experiments
Magnetic mineral identification plays an important role in mineral pre-census as well as in the study of mineralization patterns.Conventional magnetic mineral identification experiments(magnetization versus temperature,called κ-T experiment)usually use a single-cycle heating-cooling mode from room temperature to 700℃,which lacks a capture point for the characteristics of the magnetic susceptibility changes in the intermediate temperature cycles.To address this deficiency,a stepwise heating κ-T experiment is designed in this paper to detect the transformation process of magnetic minerals in different heating stages,providing a reliable basis for the accurate identification of magnetic mineral species.In this paper,the results of the stepwise heating κ-T experiments are validated and supplemented with the rock magnetism experiments,such as isothermal remanent magnetization(IRM)and demagnetization(J/Jmax),as well as scanning electron microscopy(SEM)and energy spectrum analysis(EDS)experiments.The experimental results show that the stepwise heating κ-T experiments can provide the details of magnetic mineral transformation that are missing in the traditional κ-T experiments,and combined with the coercivity characteristics,the blocking temperature,and the SEM and EDS results,the magnetic mineral types of the geological samples can be clearly identified.
万方数据
维普
