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Identifying Geochemical Anomalies Associated with Gold Mineralization Using Factor Analysis and Spectrum–Area Multifractal Model in Laowan District, Qinling-Dabie Metallogenic Belt, Central China

1
School of Earth Resources, China University of Geosciences, Wuhan 430074, China
2
No.1 Institute of Geology and exploration, Henan Geology and exploration Bureau, Zhengzhou 450001, China
3
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China
*
Author to whom correspondence should be addressed.
Minerals 2020, 10(3), 229; https://doi.org/10.3390/min10030229
Received: 30 January 2020 / Revised: 28 February 2020 / Accepted: 29 February 2020 / Published: 3 March 2020
The Laowan deposit is a typical gold deposit in the Qinling-Dabie metallogenic belt, which produces the most gold resources in Central China. After being explored for decades, follow-up exploration requires additional theoretical support. In this study, the factor analysis (FA) and spectrum–area (S–A) multifractal model were used to process multi-element geochemical data from 369 samples collected in the study area for identifying the geochemical anomalies associated with gold mineralization. The results showed that: (1) the mean Au content in this region is up to 1000 times higher than the Au background values of the upper crust of the South Qinling unit; (2) the factor analysis revealed that Au, Ag, Cu, As, Sb, and S can be used as direct ore-prospecting criteria; (3) the observed elemental zonation is consistent with the zonation of metallic elements in the magmatic–hydrothermal system. This supports the magmatic–hydrothermal origin of the Laowan deposit; (4) the spectrum–area fractal model can help to decompose the geochemical patterns in a complex geological setting. The decomposed geochemical anomaly map obtained by the S–A multifractal model indicated that highly anomalous areas have a great relationship with the Au occurrence and can be a guidance for further exploration in the study area. View Full-Text
Keywords: geochemical prospecting; geochemical association; gold deposit; geochemical anomaly separation; the Qinling-Dabie metallogenic belt geochemical prospecting; geochemical association; gold deposit; geochemical anomaly separation; the Qinling-Dabie metallogenic belt
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Wu, R.; Chen, J.; Zhao, J.; Chen, J.; Chen, S. Identifying Geochemical Anomalies Associated with Gold Mineralization Using Factor Analysis and Spectrum–Area Multifractal Model in Laowan District, Qinling-Dabie Metallogenic Belt, Central China. Minerals 2020, 10, 229.

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