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Nonlinear Processes in Geophysics An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/npg-2019-8
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/npg-2019-8
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 27 Mar 2019

Research article | 27 Mar 2019

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This discussion paper is a preprint. It is a manuscript under review for the journal Nonlinear Processes in Geophysics (NPG).

Application of fractal models to delineate mineralized zones in the Pulang porphyry copper deposit, Yunnan, Southwest China

Xiaochen Wang1, Qinglin Xia1,2, Tongfei Li1, Shuai Leng1, Yanling Li1, Li Kang1, Zhijun Chen1, and Lianrong Wu3 Xiaochen Wang et al.
  • 1Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
  • 2Collaborative Innovation Center for Exploration of Strategic Mineral Resources, Wuhan 430074, China
  • 3Yunnan Diqing Nonferrous Metal Co., Ltd., Shangri-La 674400, China

Abstract. The purpose of the paper is to depict various mineralized zones and the barren host rock in accordance with the subsurface and surface lithogeochemical data using the concentration-volume (C-V) and power spectrum-volume (S-V) fractal models within the Pulang copper deposit, southwest China. Results obtained by concentration-volume model depict four geochemical zones defined by Cu thresholds of 0.25 %, 1.38 % and 1.88 %, which represent non-mineralized wall rocks (Cu < 0.25 %), weakly mineralized zones (0.25 %–1.38 %), moderately mineralized zones (1.38 %–1.88 %), and highly mineralized zones (Cu > 1.88 %). S-V model is utilized by performing 3D fast Fourier transformation for assay data in the frequency domain. The S-V method indicates three mineralized zones characterized by Cu threshold values of 0.23 % and 1.33 %. The zones of < 0.23 % Cu represent barren host rocks and zones of 0.23 %–1.33 % Cu represent the hypogene zones and zones > 1.33 % Cu represent supergene enrichment zones. Both the multifractal models show that high grade mineralization is located at the center and south of Pulang deposit. The results are in contrast with alteration and mineralogical models resulted from the 3D geologic model utilizing the logratio matrix method. Better results were obtained from S-V model to delineate high grade mineralization of Pulang deposit. However, results of C-V method of moderate and weak grade mineralization are more precise than the results gained from S-V method.

Xiaochen Wang et al.
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Short summary
We utilized concentration-volume and power spectrum-volume fractal models to delineate different grade mineralization of Pulang deposit. The high grade mineralization determined by S-V model give better relations with potassic zones of 3D geological model based on the relationship between results of fractal methods and geological logging of drillholes.There is a better correlation between moderate and weak grade mineralization obtained from C-V model and phyllic zones of Pulang deposit.
We utilized concentration-volume and power spectrum-volume fractal models to delineate different...
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