Study on the <i>PTX</i> Parameters and Fractal Characteristics of Ore-Forming Fluids in the East Ore Section of the Pulang Copper Deposit, Southwest China

Qinglin Xia; Tongfei Li; Li Kang; Shuai Leng; Xiaochen Wang

doi:10.1007/s12583-021-1448-5

Volume 32 Issue 2

Apr 2021

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Journal of Earth Science > 2021 > 32(2): 390-407.

Qinglin Xia, Tongfei Li, Li Kang, Shuai Leng, Xiaochen Wang. Study on the PTX Parameters and Fractal Characteristics of Ore-Forming Fluids in the East Ore Section of the Pulang Copper Deposit, Southwest China. Journal of Earth Science, 2021, 32(2): 390-407. doi: 10.1007/s12583-021-1448-5

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Qinglin Xia, Tongfei Li, Li Kang, Shuai Leng, Xiaochen Wang. Study on the PTX Parameters and Fractal Characteristics of Ore-Forming Fluids in the East Ore Section of the Pulang Copper Deposit, Southwest China. Journal of Earth Science, 2021, 32(2): 390-407. doi: 10.1007/s12583-021-1448-5

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Study on the PTX Parameters and Fractal Characteristics of Ore-Forming Fluids in the East Ore Section of the Pulang Copper Deposit, Southwest China

doi: 10.1007/s12583-021-1448-5

Qinglin Xia^{1
,
,
,},
Tongfei Li^{2, 3
,
,
,},
Li Kang⁴,
Shuai Leng¹,
Xiaochen Wang¹

1.
School of Earth Resources, China University of Geosciences, Wuhan 430074, China
2.
Research Center for Petrogenesis and Mineralization of Granitoid Rocks, China Geological Survey, Wuhan 430205, China
3.
Wuhan Center of Geological Survey CGS, Wuhan 430205, China
4.
Economic and Information Bureau of Liangshan Yi Autonomous Prefecture of Sichuan Province, Xichang 615000, China

More Information

Corresponding author: Qinglin Xia, qlxia@cug.edu.cn; Tongfei Li, tongfei1992@hotmail.com
Received Date: 11 Nov 2020
Accepted Date: 03 Mar 2021
Publish Date: 01 Apr 2021

Abstract

Abstract

In this paper, the east ore section of the Pulang porphyry copper deposit is selected as the research object. The micro-thermometer and laser Raman spectroscopic technique are utilized to study the parameters of ore-forming fluids such as pressure, temperature, and compositions. In the meantime, the fractal models, including the perimeter-area (P-A) model and number-size (N-S) model, are introduced to quantify the shape of fluid inclusions, and distinguish the stages of ore-forming fluids, respectively. The results show that the types of fluid inclusions are diversified, namely two-phase liquid-rich type, two-phase vapor-rich type, three-phase CO₂-rich type, three-phase halite-bearing type and pure liquid type. The fluids of main mineralization stage are characterized by medium-high temperature (170.2-421.4℃), medium-high salinity (9.3 wt.%-33.3 wt.%), and low density (0.73-1.06 g/cm³). With the migration and evolution, the temperature, salinity, and pressure of ore-forming fluids gradually decrease, while the density of fluids increases. The liquid-phase compositions mainly include H₂O, and the vapor-phase compositions consist of H₂O, CH₄, N₂, and CO₂, indicating the characteristics of reducing fluids and the mixing of atmospheric precipitation. In general, the characteristics of ore-forming fluids in the east ore section are similar to those of the first mining area, suggesting that the ore-forming fluids in the east ore section may not migrate from the first mining area. And the east ore section may be a relatively independent metallogenic system. Moreover, the fractal analysis results demonstrate that the shape of fluid inclusions formed in the same hydrothermal activity features self-similarity. The D_AP values of fluid inclusions in B veins, ED veins, and D veins are 1.04, 1.06 and 1.10, respectively, showing a gradually increasing trend from the main stage to the late stage of mineralization. Meanwhile, the shape of fluid inclusions ranging from B veins to D veins becomes increasingly irregular. It also reveals that the homogenization temperature satisfies fractal distribution with four scale-invariant intervals, suggesting that all B veins, ED veins, and D veins have experienced at least four hydrothermal activities. Compared with histogram, the N-S fractal model is able to describe the distribution characteristics of the ore-forming fluids' homogenization temperature more precisely. Therefore, it presents a potential tool for the stage division of ore-forming fluids. This research provides information about the characteristics of ore-forming fluids in the east ore section of the Pulang porphyry copper deposit, which is beneficial for further exploration in this region, and the extension of the application of fractal models in the study of fluid inclusions. However, further testing of fractal models on the fluid inclusion study is warranted to fully determine the universality.
- perimeter-area model,
- number-size model,
- fluid inclusion,
- fractal,
- Pulang copper deposit

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References(97)

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