Abstract
Abstract The Benxi area in Liaoning Province is one of the most important iron-ore districts in China. This study uses nonseismic geophysical data (in the form of gravity–magnetic–magnetotelluric data) and based on the section modeling method to model the deep, three-dimensional geological structure of the Benxi area. Based on the modeling results and deep geological structure characteristics, the Benxi area can be divided into three first-order deep geological tectonic units. A close relationship is between tectonic unit and iron-ore concentrations. First, high-quality iron-ore deposits occur within the tectonic boundary and sedimentary boundary zone of the Jiao–Liao–Ji Belt, reflects the protective effect of sedimentary cover on the iron-bearing formation. Second, enriched iron-ore deposits are mainly developed in Mesozoic granitic intrusion zone, reflects the hydrothermal leaching of silicon in host iron-bearing formations during magma intrusion. Thus, the findings of this study have important implications for future prospecting in the Benxi iron-ore district.
Highlights
The Benxi area in Liaoning Province is one of the most important iron-ore districts in China
Neoarchean banded iron formation (BIF) deposits in Benxi, China, are located in the transition zone between the northern boundary of the Jiao–Liao–Ji Belt and the Longgang Block, which is situated in the eastern segment of the northern margin of the North China Craton (Figure 1c; [15])
According to the basement compositions, the spatial relationships between the basement and the cover, the compositions of the cover and the later transformations, the Benxi area can be divided into three first-order tectonic units (I–III): the Jiao–Liao–Ji Belt, a Mesozoic granite intrusion zone, and the Longgang Block, respectively
Summary
This study uses nonseismic geophysical data (in the form of gravity–magnetic–magnetotelluric data) and based on the section modeling method to model the deep, threedimensional geological structure of the Benxi area. The Anshan-Benxi (An-Ben) area (Figure 1b) in Liaoning, China, hosts an important Neoarchean banded iron formation (BIF) deposit, accounting for 40% of China’s BIF-derived iron-ore resources [1]. The discovery of the Dataigou deposit suggests the potential for deep iron-ore deposits in the An-Ben area, and which generates significant interest in the deep geological structure of the area. Data; those authors estimated that iron-ore deposits in the Anshan area could extend down to depths of 5,600 m, implying significant prospecting potential. To better constrain the deep geological structures of the Benxi area, high-precision gravity–magnetic–magnetotelluric (MT) surveys were conducted
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