Gravity and magnetic field features and the prospects of iron deposits in the eastern Hebei province, China

Abstract

To study the features of the gravity and magnetic anomalies and the prospects of iron deposits in eastern Hebei Province, we collected and arranged gravity data at scales of 1:50,000 and 1:200,000 and aeromagnetic data at scales of 1:25,000 and 1:200,000. Then, we separated the Bouguer gravity anomaly and the RTP aeromagnetic anomaly by the moving average method, and processed these two anomalies using the total horizontal gradient method and the vertical second derivative method. Combined with existing geological and geophysical research, we studied the features of the gravity and magnetic anomalies and investigated the corresponding relationship between the distribution of iron deposits and these anomalies, and then we predicted the favorable areas for iron deposits in eastern Hebei Province. The results showed that there is a good corresponding relationship between the distribution of iron deposits and the gravity and magnetic anomalies in eastern Hebei Province. Identification marks of the gravity and magnetic anomalies are determined to find the iron deposits in eastern Hebei Province, including the magnetic highs of the local magnetic anomaly and the vertical second derivative anomaly, the gravity highs of the local gravity anomaly and the vertical second derivative anomaly, the gradient belts of the Bouguer gravity anomaly, the high-value zones of the RTP aeromagnetic anomaly, and the extreme-value zones of the total horizontal gradient of the Bouguer gravity anomaly and the RTP aeromagnetic anomaly. There are 17 favorable areas for iron deposits in eastern Hebei Province, and these favorable areas display complex trends, including EW-trending, NNW-trending, and NEE-trending features.

Gravity Prediction Method and the Application of Full-Space Tunnels in the Deep Extension of High-Density Vertical Orebodies

“…Currently, the theory of gravity exploration is relatively well developed as the factors of interference and terrain influence have been extensively studied (Fu, 2010;Hu, 2015;Zhang et al, 2015). Research on the instruments (Cai, 1980;Zeng, 1999;Geng, 2016;Lu et al, 2018), operating methods, data processing, forward and inverse calculations, non-ferrous metal detection, and coal mine safety (Goodacre, 1973;Beyer, 1979;Okabe, 1979;Schmoker, 1980;Casten and Gram, 1989;Li and Chouteau, 1998;Nagy et al, 2000;Yang et al, 2000;Fan, 2007;Luo, 2008;Yi et al, 2008;Cao, 2011;Zhdanov et al, 2011;Howell et al, 2012;Luo and Liu, 2012;Zhang, 2012;Zhang et al, 2012;Teng et al, 2013;Liu and Liu, 2014;Wang et al, 2014;Zhang, 2017;Ming et al, 2021) has been conducted worldwide.…”