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Extraction of Gravity–Magnetic Anomalies Associated with Pb–Zn–Fe Polymetallic Mineralization in Luziyuan Ore Field, Yunnan Province, Southwestern China

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Abstract

The method of bi-dimensional empirical mode decomposition (BEMD) and the combined methods of entropy weight–Technique for Order of Preference by Similarity to an Ideal Solution (TOPSIS) were used to decompose gravity–magnetic data and evaluate targets in the Luziyuan Pb–Zn–Fe polymetallic ore field and surrounding areas. Three meaningful bi-dimensional intrinsic mode function (BIMF) images were obtained by BEMD at different wavelengths, depicting different layers of geological architectures in the study area. The results are as follows. (1) The BIMF2 images depict the shallow local geological architecture and show positive gravity–magnetic anomalies of the skarn alteration and Pb–Zn–Fe mineralization distributed around concealed granites. (2) The BIMF3 images depict the medium-depth geological architecture, indicating that concealed granitic stocks, which are shallow extensions of a deeply concealed pluton, intruded along the NE-trending fault. (3) The BIMF4 images depict gravity–magnetic anomalies at greater depth, which likely reflect regional geological architectures, indicating the potential presence of a large, concealed intermediate-acid pluton in the negative anomaly zone. Three potential targets (A, B, and C) were delineated based on BEMD results of the original gravity–magnetic data. The entropy weight–TOPSIS evaluation results show that the ranking of the metallogenic potential of the delineated targets in the study area is B, A, and C, with relative proximity values of 0.4576, 0.3925, and 0.1499, respectively. The results of this study can be used to guide future exploration.

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Acknowledgments

The authors are grateful to Yingxiang Lu and Chengxing Jiang senior engineers for their help with data collection, the Editor-in-Chief (Prof. John Carranza), the Guest Editor (Prof. Yue Liu), and the anonymous reviewers for the detailed comments. This work was supported by the National Natural Science Foundation of China (Grant Numbers 41972312, 41672329), the National Key Research and Development Project of China (Grant Number 2016YFC0600509), the Project of China Geological Survey (Grant Number 1212011120341), and the Natural Resources Research Student Awards in 2020.

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Shang, Z., Chen, Y., Xu, X. et al. Extraction of Gravity–Magnetic Anomalies Associated with Pb–Zn–Fe Polymetallic Mineralization in Luziyuan Ore Field, Yunnan Province, Southwestern China. Nat Resour Res 31, 1963–1979 (2022). https://doi.org/10.1007/s11053-021-09924-3

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