| Professional Committee of Rock and Mineral Testing Technology of the Geological Society of China, National Geological Experiment and Testing Center | Host |
| Citation: |
SUN Shiqiang, CHEN Cuihua, ZHAO Wenhao, LAI Xiang, MA Tianqi, ZHANG Haijun, QIAO Mengyi, SONG Zhijiao, CHEN Xiaojie, GU Ying. Mineral Typomorphic Characteristics and Deposit Genesis of Germanium-Enriched Sphalerite from Wusihe in the Southwestern Margin of the Yangtze Block[J]. Rock and Mineral Analysis, 2025, 44(2): 214-229. doi: 10.15898/j.ykcs.202406210138
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Mineral Typomorphic Characteristics and Deposit Genesis of Germanium-Enriched Sphalerite from Wusihe in the Southwestern Margin of the Yangtze Block
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Abstract
The Wusihe lead-zinc deposit, situated at the southwestern margin of the Yangtze Block and a prominent Ge-enriched deposit within the Sichuan—Yunnan—Guizhou lead-zinc metallogenic belt, faces ongoing debates regarding its genesis. The influence of sphalerite typomorphic characteristics on Ge enrichment and substitution mechanisms within the deposit remains a crucial puzzle to unravel. To address this, the paper employs quantitative analyses using microscopic spectrophotometry and laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS). The results reveal the presence of two sphalerite stages during the hydrothermal period: a darker Stage Ⅰ and a lighter Stage Ⅱ. Despite similar mean values for visual reflectance and the dominant wavelength of reflectance color, the mean reflectance color saturation differs (0.048 and 0.043, respectively), with corresponding average Ge contents of 244.33×10−6g/g and 43.22×10−6g/g, respectively. The experimental outcomes conclude that Ge exists in sphalerite as isomorphism and is more concentrated in sphalerite with higher reflectance color saturation. The ore-forming temperature is medium to low, classifying the deposit as a Mississippi Valley-type lead-zinc deposit. The BRIEF REPORT is available for this paper at
http://www.ykcs.ac.cn/en/article/doi/10.15898/j.ykcs.202406210138 . -
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References
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SUN Shiqiang, CHEN Cuihua, ZHAO Wenhao, LAI Xiang, MA Tianqi, ZHANG Haijun, QIAO Mengyi, SONG Zhijiao, CHEN Xiaojie, GU Ying. Mineral Typomorphic Characteristics and Deposit Genesis of Germanium-Enriched Sphalerite from Wusihe in the Southwestern Margin of the Yangtze Block[J]. Rock and Mineral Analysis, 2025, 44(2): 214-229. doi: 10.15898/j.ykcs.202406210138
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Figure 1.
(a) China’s tectonic background; (b) Distribution and location map of lead-zinc deposits in the Yangtze Platform (modified by Xiong, et al.［15］); (c) Geological map and sampling points of the Wusihe deposit (modified by Luo, et al.［18］)
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Figure 2.
Characteristics of sphalerite specimens in two stages of Wusihe deposit (Sp—Sphalerite; Gn—Galena; Cal—Calcite; Sar—Sulfide mineral)
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Figure 3.
Microscopic characteristics of sphalerite in two stages of Wusihe deposit
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Figure 4.
Box diagrams of visual reflectance (a), reflected color main band (b) and reflected color saturation (c) of sphalerite in two stages of Wusihe deposit
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Figure 5.
Time resolution curves of trace elements of SpⅠ stage (a) and SpⅡ stage (b) sphalerite in Wusihe deposit
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Figure 6.
Relationship of trace elements of sphalerite in two stages of Wusihe deposit
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Figure 7.
Line diagrams of sphalerite girth and trace elements in Wusihe deposit
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Figure 8.
Identification diagrams of genetic types of trace elements in sphalerite
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Figure 9.
Genetic type discrimination diagram of color index characteristics of sphalerite (Modified by Lai, et al［6］. The score coefficients of log(λd), log(Rvis) and log(Pe) on PC1 are 0.584, 0.584 and −0.005, respectively, and those on PC2 are 0.055, −0.047 and 0.996, respectively)