Sulfide-Rich Miarolitic Cavities: Unveiling the Genesis of Ore Formation in the Magmatic to Hydrothermal Stages in Porphyry Deposits

Tao Hong; Chu Wu; Zhaoxia Liao; Xingwang Xu; Xiao Zheng; Chengxi Wang; Jun Gao

doi:10.1007/s12583-024-0117-x

Volume 37 Issue 1

Feb 2026

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Journal of Earth Science > 2026 > 37(1): 60-80.

Tao Hong, Chu Wu, Zhaoxia Liao, Xingwang Xu, Xiao Zheng, Chengxi Wang, Jun Gao. Sulfide-Rich Miarolitic Cavities: Unveiling the Genesis of Ore Formation in the Magmatic to Hydrothermal Stages in Porphyry Deposits. Journal of Earth Science, 2026, 37(1): 60-80. doi: 10.1007/s12583-024-0117-x

Citation:

Tao Hong, Chu Wu, Zhaoxia Liao, Xingwang Xu, Xiao Zheng, Chengxi Wang, Jun Gao. Sulfide-Rich Miarolitic Cavities: Unveiling the Genesis of Ore Formation in the Magmatic to Hydrothermal Stages in Porphyry Deposits. Journal of Earth Science, 2026, 37(1): 60-80. doi: 10.1007/s12583-024-0117-x

Citation:

Tao Hong, Chu Wu, Zhaoxia Liao, Xingwang Xu, Xiao Zheng, Chengxi Wang, Jun Gao. Sulfide-Rich Miarolitic Cavities: Unveiling the Genesis of Ore Formation in the Magmatic to Hydrothermal Stages in Porphyry Deposits. Journal of Earth Science, 2026, 37(1): 60-80. doi: 10.1007/s12583-024-0117-x

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Sulfide-Rich Miarolitic Cavities: Unveiling the Genesis of Ore Formation in the Magmatic to Hydrothermal Stages in Porphyry Deposits

doi: 10.1007/s12583-024-0117-x

Tao Hong^{1, 2, 3
,},
Chu Wu^{4
,
,
,},
Zhaoxia Liao^{3, 5
,},
Xingwang Xu^{3, 5
,},
Xiao Zheng^4
,,
Chengxi Wang^4
,,
Jun Gao^{3, 5}

1.
Guangdong Provincial Key Lab of Geodynamics and Geohazards, School of Earth Sciences and Engineering, Sun Yat-sen University, Guangzhou 510275, China
2.
Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519082, China
3.
State Key Laboratory of Lithospheric and Environmental Coevolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
4.
Development and Research Center of China Geology Survey, Beijing 100037, China
5.
College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China

More Information

Corresponding author: Chu Wu, wuchu@mail.cgs.gov.cn
Received Date: 02 Aug 2024
Accepted Date: 11 Nov 2024

Available Online: 13 Feb 2026

Issue Publish Date: 28 Feb 2026

Abstract

Abstract

The role of ore metals in magmatic fluids during the magmatic-hydrothermal transition in porphyry systems remains unclear, and their contributions to porphyry ore genesis are unclear. This study offers fresh perspectives on the ore-forming process during this critical transition, focusing on the Hongyuan porphyry Mo (Cu) deposit (PMCD) in West Junggar, China. We find that sulfide-quartz-rich miarolitic cavities (MCs), characterized by micrographic quartz and feldspar, indicate the formation of initial mineralizing fluids from magmatic fluids. This conclusion is supported by three key observations: the simultaneous formation of feldspar and sulfides in the micrographic zones of MCs, the high formation temperatures (approaching 750 ℃) suggested by the sector-zoned bright CL cores of quartz phenocrysts, and the magmatic sulfur source indicated by the narrow sulfur isotopic composition ranges (+0.18‰ to +4.63‰). LA-ICP-MS analyses reveal distinct trace element distribution patterns between the early magmatic and transition stages and the later hydrothermal stage. Chalcopyrite from the early stages has higher Cd and lower Zn contents, while molybdenite has higher Re contents, and pyrite has higher Co and Ni contents than its counterparts in the hydrothermal stage. The decrease in sulfur concentrations at sulfide saturation from granite porphyry to micrographic quartz-feldspar melts (from 200 ppm to 100 ppm) suggests that nearly half of the sulfur was exsolved during the formation of feldspar and quartz intergrowths from fractionated granitic magma. These findings indicate that the initial mineralizing fluids of the porphyry deposit were high-temperature, melt-bearing, and ore-rich and originated from magma. The transition from initial melt-bearing, metal-rich fluids to hydrothermal ore-forming fluids is marked by decreasing temperatures and logf_S2 values, underscoring the critical role of sulfide formation during the magmatic-hydrothermal transition in the development of porphyry deposits.
- sulfide-rich miarolitic cavities,
- magmatic to hydrothermal stages,
- ore-forming fluid evolution,
- metallogenic dynamics,
- Hongyuan porphyry deposits

Electronic Supplementary Materials: Supplementary Materials (Tables S1–S5) are available in the online version of this article at https://doi.org/10.1007/s12583-024-0117-x.
Conflict of Interest
The authors declare that they have no conflict of interest.

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