Abstract
The Yeoncheon titanomagnetite deposit formed by Precambrian magma differentiation is located in Gyeonggi-do, South Korea. Our team conducted an airborne magnetic survey for multiscale mineral exploration and then selected a promising survey area. An electrical resistivity survey was carried out in the potential area to image subsurface structure. Because ore minerals are mainly distributed in gabbro monzodiorite rather than quartz monzodiorite, we applied three-dimensional inversion of electrical resistivity tomography (ERT) data to identify lithology boundaries related to magma differentiation. The resistivity criterion distinguishing the lithologies of gabbro and quartz monzodiorite was determined from laboratory resistivity experimental results performed on drilling cores. The selected region for gabbro monzodiorite extends to the northeast direction, which is consistent with the geology map, magnetic anomaly, and drilling data. The inversion results of ERT can help in selecting the location of geophysical survey or drilling.
Highlights
The titanomagnetite (TM) deposits in South Korea, which originated from intrusion into Precambrian metasedimentary rocks, are distributed in Yeoncheon, Boremdo, and Soyeonpyeongdo
The 2D inversion results for each survey line can be interpreted independently, but these can be used as the bases for 3D inversion
To interpret the interior of the 3D electrical resistivity inversion results, we used the drilling data obtained by Korea Institute of Geoscience and Mineral Resources (KIGAM) in 2019 [17]
Summary
The titanomagnetite (TM) deposits in South Korea, which originated from intrusion into Precambrian metasedimentary rocks, are distributed in Yeoncheon, Boremdo, and Soyeonpyeongdo. As a co-product of steel production, the rare transition metal vanadium is extracted from TM deposits [1]. The main use of vanadium is as an additive to steel alloys, and it has been applied in the automobile, aviation, and defense industries because of its high strength and resistance at high temperature. The vanadium redox flow battery has been considered a suitable secondary battery for long-term energy storage systems [2]. Exploration of TM deposits primarily enables steel production and contributes to vanadium extraction. The target of this study was the Yeoncheon TM deposits, found in the Gonamsan igneous layered intrusion.
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