会泽铅锌矿床成矿流体浓缩机制

张振亮; 黄智龙; 饶冰; 管涛; 严再飞

Volume 30 Issue 4

Jul. 2005

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Article Navigation > Earth Science > 2005 > 30(4): 443-450

ZHANG Zhen-liang, HUANG Zhi-long, RAO Bing, GUAN Tao, YAN Zai-fei, 2005. Concentration Mechanism of Ore-Forming Fluid in Huize Lead-Zinc Deposits, Yunnan Province. Earth Science, 30(4): 443-450.

Citation:

ZHANG Zhen-liang, HUANG Zhi-long, RAO Bing, GUAN Tao, YAN Zai-fei, 2005. Concentration Mechanism of Ore-Forming Fluid in Huize Lead-Zinc Deposits, Yunnan Province. Earth Science, 30(4): 443-450.

ZHANG Zhen-liang, HUANG Zhi-long, RAO Bing, GUAN Tao, YAN Zai-fei, 2005. Concentration Mechanism of Ore-Forming Fluid in Huize Lead-Zinc Deposits, Yunnan Province. Earth Science, 30(4): 443-450.

Citation:

ZHANG Zhen-liang, HUANG Zhi-long, RAO Bing, GUAN Tao, YAN Zai-fei, 2005. Concentration Mechanism of Ore-Forming Fluid in Huize Lead-Zinc Deposits, Yunnan Province. Earth Science, 30(4): 443-450.

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Concentration Mechanism of Ore-Forming Fluid in Huize Lead-Zinc Deposits, Yunnan Province

ZHANG Zhen-liang^{1, 2
,},
HUANG Zhi-long¹,
RAO Bing³,
GUAN Tao^{1, 2},
YAN Zai-fei^{1, 2}

1.
Open Laboratory of Ore Deposit Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
2.
Postgraduate School, Chinese Academy of Sciences, Beijing 100039, China
3.
State Key Laboratory of Mineral Deposit Research, Department of Earth Sciences, Nanjing University, Nanjing 210093, China

Received Date: 2005-01-28
Publish Date: 2005-07-25

Abstract

Abstract

The Huize Pb-Zn ore deposits, Yunnan Province, located in the southern-center of the Sichuan-Yunnan-Guizhou Pb-Zn-Ag multimetal mineralization district, are strictly controlled by faulted zones. There has long been controversy about the sources of ore-forming fluid in these ore deposits. Calcite is one of the gangue minerals in the ores of these ore deposits. Their δ¹³C (PDB) values vary from -2.1×10^-3 to -3.5×10^-3, and their δ¹⁸O (SMOW) values are 16.7×10^-3 to 18.6×10^-3. There are no obvious difference in the δ¹³C (PDB) values and the δ¹⁸O (SMOW) values of calcites from different orebodies, different occurrences and different elevations. Besides pure liquid inclusions (L) and gas-liquid inclusions with rich liquid (L+V), three-phase inclusions containing a daughter (S+L+V) and immiscible three-phase CO₂ inclusions (V_CO₂+L_CO₂+L_H₂O) occur in the minerals. The homogenization temperatures of all these inclusions vary from 110 ℃ to 400 ℃, and have two peaks. (⁸⁷Sr/ ⁸⁶Sr) ₀ ratios of these ore deposits (0.713 676-0.717 012) are obviously higher than those of the mantle (0.704±0.002) and Emeishan basalt (0.703 932-0.707 818; 85 samples), and slightly higher than those of the Baizuo Formation of Huize lead-zinc ore deposits (0.708 68-0.709 31; 3 samples). But all these ratios are lower than the ones of the basement rocks (0.724 3-0.728 8; 5 samples). The (⁸⁷Sr/ ⁸⁶Sr) ₀ ratios of these ore deposits also show that the isotopic fractionation of Sr does not occur in the ore-forming fluid during the precipitation of minerals. So, the ore-forming fluid is homogeneous and a product of different fluid mixing.Gas-liquid inclusions can be obviously separated into two groups in the range of 300-400 ℃ according to their salinities: a group with the salinity of 5%-6% (w (NaCl)) and the other group with the salinity of 12%-16% (w (NaCl)). However, the salinities of inclusions vary from 7% to 23% (w (NaCl)) in the range of 100-300 ℃, especially the range of 150-250 ℃. The pressures of faulted zones are 50×10⁵-320×10⁵ Pa and the pressures of overlying rocks on the ore bodies are 574×10⁵-640×10⁵ Pa, and those of the ore-forming processes vary from 145×10⁵ to 754×10⁵ Pa. When the ore-forming fluid flows into the faulted zones, its pressure sharply reduces. Then boiling occurs in the ore-forming processes. As a result of fluids mixing and boiling, the ore-forming fluid is highly concentrated. When the fluid is saturated or oversaturated, metallic minerals begin to precipitate on a great scale. So, the grade of lead-zinc ores is very high.
- fluid mixing,
- boiling,
- relief of pressure,
- high grade

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References(50)

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Concentration Mechanism of Ore-Forming Fluid in Huize Lead-Zinc Deposits, Yunnan Province

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