Thermoelectric Characteristics of Magnetite and Its Application: A Case Study of Bayan Obo Deposit

doi:10.19657/j.geoscience.1000-8527.2024.110

Abstract

Abstract:

Thermoelectric typomorphism of pyrite has been widely used in prospecting and prediction of gold deposits. However, the thermoelectric characteristics of magnetite and its application in prospecting are rarely reported. Taking the main mining area of Bayan Obo Iron deposit as the research object, the thermoelectric coefficient measuring instrument BHTE-08 has been used to test and study the pyroelectric property of magnetite. The results show a significant thermoelectric anomaly in the eastern part of the main mining area, which is closely related to the occurrence of metal sulfides (especially pyrite and pyrrhotite) through microscopic observation. In particular, the proportion of magmatic magnetite in this anomaly area is high, so it is speculated that magmatism leads to a large amount of magnetite and sulfide accumulation in this area, which may be a channel for deep magma ascent. This understanding is important and significant for deep prospecting in Bayan Obo’s main-east mining area. In addition, the thermoelectric properties of magnetite and pyrite mixed samples in different proportions under artificial conditions are tested, and it is considered that the pyroelectric characteristics of magnetite have broad application prospects and practical significance in evaluating the quality of iron ore.

Key words: mineral thermoelectric effect, metallogenic prediction, ore quality evaluation, Bayan Obo deposit

CLC Number:

P571
P618.51

LIU Minghui, SHEN Junfeng, YANG Yongqiang, WANG Zhaojing, CHEN Qiang, TANG Nanyu. Thermoelectric Characteristics of Magnetite and Its Application: A Case Study of Bayan Obo Deposit[J]. Geoscience, 2025, 39(03): 560-569.

Figures/Tables 11

Fig.1 Geologic map of Bayan Obo mining area[16]

Fig.2 Scatter diagram of thermoelectric coefficient of magnetite sample in Bayan Obo main mining area

Fig.3 Comparison of thermoelectric coefficient between magnetite and specimen company magnetite in Bayan Obo main mining area

Fig.4 Microscopic characteristics of minerals under optical microscope

Fig.5 Scatter diagram of thermoelectric coefficient of sulfide at ΔT = 80 ℃

Fig.6 Box diagram of thermoelectric coefficient of magnetite and pyrite under different mixing conditions

Fig.7 Scatter diagram of average thermoelectric coefficient under different proportions of magnetite and pyrite

Fig.8 Longitudinal projection contour map of thermoelectric coefficient in Bayan Obo main mining area

Fig.9 3D model of thermoelectric coefficient in Bayan Obo main mining area

Fig.10 Section view of 3D model of thermoelectric coefficient in Bayan Obo main mining area

Fig.11 3D stereogram of thermoelectric coefficient isosurface in Bayan Obo main mining area

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